What is the rule of 3 for anemia? Understanding Blood Count RDW High

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Doctors use a simple rule called the “rule of 3” to check for anemia. This rule helps them quickly check if red blood cell (RBC) indices like RBC count, hemoglobin (Hb), and hematocrit (Hct) are correct.

The “rule of 3” says that hemoglobin levels are usually three times the RBC count. Also, hematocrit percentages are about three times the hemoglobin level. If these numbers don’t match, it could mean there’s a problem with the red cells, a mistake in the lab, or dehydration.

Knowing this rule is key to spotting anemia and finding out why it’s happening. For example, a high RDW blood test shows that red cells are not all the same size. This can point to specific types of anemia.

Key Takeaways

• The “rule of 3” is a laboratory principle that links RBC count, hemoglobin, and hematocrit levels.
• It helps clinicians rapidly assess the plausibility of laboratory results.
• Significant discrepancies may indicate lab error, abnormal red cell morphology, or fluid status changes.
• A high RDW value can indicate variation in red cell size.
• Understanding the “rule of 3” is vital for diagnosing anemia and its causes.

The Fundamentals of the Rule of3 in Anemia

In the world of anemia diagnosis, the rule of 3 is key. It’s a simple tool for doctors. We’ll look at what it is, how it works, and why it’s important.

Definition and Basic Concept

The rule of 3 connects three important blood cell measures: Red Blood Cell Count (RBC), Hemoglobin (Hb), and Hematocrit (Hct). It says Hemoglobin should be about one-third of Hematocrit, and RBC count times 3 should match Hemoglobin. Knowing this helps doctors check lab results and make good decisions.

For example, if Hematocrit is 40%, Hemoglobin should be about 13.3 g/dL. If RBC count is 4.5 million/μL, multiplying it by 3 should get us close to Hemoglobin. This check helps spot mistakes or unusual conditions, like too many RBCs in dehydration or polycythemia.

Historical Development of the Rule

The rule of 3 started in hematology’s early days, when tests were simpler. As we learned more about blood, so did the rule’s use. It’s now a quick way for doctors to check lab results, helping with anemia diagnosis.

Knowing the rule’s history helps us see its ongoing value. Even with new lab tech, it’s a basic but powerful tool for checking anemia.

Understanding the Three Key Blood Parameters

Understanding the rule of 3 involves examining three crucial blood tests: Red Blood Cell Count, Hemoglobin levels, and Hematocrit percentage. These tests help doctors check if a patient has enough red blood cells and diagnose anemia.

Red Blood Cell Count (RBC)

The Red Blood Cell Count, or RBC count, shows how many red blood cells are in your blood. It’s key for spotting anemia and other blood issues. The normal range for RBC count is different for men and women. Men usually have 4.32 to 5.72 million cells per microliter, while women have 3.90 to 5.03 million cells per microliter.

Hemoglobin (Hb) Levels

Hemoglobin is a protein in red blood cells that carries oxygen. Hemoglobin levels are important for diagnosing anemia. Normal levels are 13.5 to 17.5 grams per deciliter for men and 12 to 16 grams per deciliter for women.

Hematocrit (Hct) Percentage

The Hematocrit, or Hct, shows what part of your blood is red blood cells. It’s a percentage. Normal Hematocrit percentages are 40.7% to 50.3% for men and 36.1% to 48.3% for women.

These three tests give a full picture of a patient’s red blood cell health. They help doctors diagnose and treat anemia and other related conditions.

The Mathematical Relationship in the Rule of3

In the world of blood tests, the rule of 3 is a simple yet powerful tool. It helps us understand the relationship between red blood cells, hemoglobin, and hematocrit. This rule uses a basic math ratio to make blood test results easier to understand.

The 1:3:3 Ratio Explained

The rule of 3 is based on a simple math relationship. It says that hemoglobin is about three times the red blood cell count. Also, the hematocrit percentage is about three times the hemoglobin level. This 1:3:3 ratio helps doctors check if blood test results are correct.

For example, if there are 4 million red blood cells per microliter, we expect hemoglobin to be around 12 g/dL. The hematocrit percentage should be about 36%. But, this ratio can change a bit because of different factors.

Key components of the 1:3:3 ratio include:

• RBC count as the base value
• Hb level being approximately three times the RBC count
• Hct percentage being approximately three times the Hb level

Practical Examples of the Rule in Action

The rule of 3 is very useful in checking blood test accuracy. For example, with 5 million red blood cells per microliter, we expect hemoglobin to be 15 g/dL and hematocrit to be 45%. This matches the 1:3:3 ratio.

If the numbers don’t match, it might mean there’s an error in the lab or a health issue. For instance, too many red blood cells could mean polycythemia. Too few might mean anemia.

It’s important to know what a high or low red blood cell count means. A high red blood cell count can be a sign of polycythemia vera or a body’s response to low oxygen. A low RBC count can mean anemia, which could be caused by lack of iron, vitamins, or chronic disease.

Also, a high mean cell hemoglobin (MCH) can indicate mean cell hemoglobin high conditions. These are often linked to anemia or other blood disorders.

Clinical Significance of the Rule of3

The rule of 3 is very important in diagnosing anemia. It helps doctors understand blood count results better. This rule is key for making good decisions about patient care.

Rapid Assessment of Laboratory Results

The rule of 3 makes it easier to quickly check lab results. It helps doctors spot problems with red blood cells and hemoglobin fast. This makes diagnosing quicker.

Early Detection of Abnormalities

The rule of 3 helps find problems early in blood tests. Finding these issues early is key to starting the right treatment. For example, a high RDW can mean a problem that needs more checking.

Quality Control in Laboratory Testing

The rule of 3 is also important for keeping lab tests accurate. It checks if blood count results are right. If not, it means more tests or checks are needed.

In short, the rule of 3 is a big help in medicine. It makes understanding lab results, finding problems, and keeping tests accurate better. Its role in anemia diagnosis shows how important it is to know and use this rule well.

When the Rule of3 Doesn’t Apply

The rule of 3 is helpful for checking anemia, but it’s not always right. Knowing when it doesn’t work is key for correct diagnosis and treatment. We’ll look at times when the rule of 3 fails, like in some diseases, lab mistakes, and changes in how much fluid we have.

Pathological Conditions

Some diseases can make the rule of 3 not work. For example, iron deficiency anemia often raises the red blood cell distribution width (RDW). Understanding red blood cell distribution width is vital here. It shows how different red blood cells are, which the rule of 3 might miss.

Vitamin B12 or folate deficiency can also mess with the rule of 3. These issues change how red blood cells are made and look. We need to think about these when we look at lab results.

Laboratory Errors

Lab mistakes can also mess up the rule of 3. Mistakes in taking the sample, handling it, or testing it can give wrong numbers for red blood cells, hemoglobin, or hematocrit. Quality control measures are key to avoid these errors and get accurate lab results.

For instance, if a sample is not tested right away, it can change. This can make the rule of 3 less reliable. We must follow strict protocols for handling and testing samples to keep results accurate.

Fluid Status Changes

Fluid status changes, like dehydration or too much water, can also affect the rule of 3. Dehydration can make blood seem more concentrated, raising hematocrit and hemoglobin. On the other hand, too much water can dilute blood, lowering these values.

It’s important to know the patient’s fluid status when using the rule of 3. We must think about this when looking at lab results to avoid wrong diagnoses or treatments. Causes of high RDW and other related factors should be looked at with the patient’s overall health in mind.

In summary, the rule of 3 is useful but not always right. We need to know when it fails and consider diseases, lab mistakes, and fluid changes. This way, we can make sure we diagnose and treat correctly.

Blood Count RDW High: Causes and Implications

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The Red Cell Distribution Width (RDW) is a part of blood tests. It shows if there are health problems. It measures how different the sizes of red blood cells are.

What is Red Cell Distribution Width?

RDW shows how different the sizes of red blood cells are. This can mean different things about your health. A high RDW means the sizes vary a lot, which can point to several issues.

Normal vs. Elevated RDW Values

RDW values usually range from 11.8% to 14.5%. But, this can change slightly from lab to lab. A high RDW is above this range. For example, research shows it’s linked to heart problems.

Conditions Associated with High RDW

High RDW values can mean several things. This includes iron deficiency anemia, vitamin B12 or folate deficiency, and chronic diseases. It also means a higher risk of heart disease and death.

• Anemia: High RDW often means iron deficiency anemia or other anemias with big size differences in RBCs.
• Chronic Diseases: Diseases like chronic kidney or liver disease can also raise RDW.
• Cardiovascular Disease: High RDW is linked to more heart problems, making it a useful marker.

Knowing what high RDW means is key for doctors. It helps them find and treat problems. It’s a useful tool for understanding a patient’s health.

Red Cell Distribution Width Interpretation

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Understanding the Red Cell Distribution Width (RDW) is key to reading complete blood count (CBC) results. RDW shows how different red blood cells are in size. It can hint at several health issues.

Understanding RDW in Complete Blood Count

RDW is part of a CBC, a common blood test. It tells us about red blood cells. A high RDW means red blood cells vary a lot in size. This can point to iron deficiency anemia.

Interpreting RDW values means looking at them with other CBC details. For example, a high RDW and low MCV might mean iron deficiency anemia. But a high RDW with normal MCV could hint at vitamin B12 or folate deficiency.

Clinical Significance of Elevated RDW

An elevated RDW is important because it can signal an underlying issue. Conditions associated with high RDW include nutritional deficiencies and chronic diseases. It can also show inflammation and mixed anemia.

• Nutritional deficiencies: Iron, vitamin B12, or folate deficiency.
• Chronic diseases: Chronic kidney disease, chronic liver disease.
• Mixed anemia: Presence of more than one type of anemia.

RDW as a Prognostic Indicator

RDW is also seen as a prognostic indicator in many diseases. Research links high RDW to worse outcomes in heart failure, chronic kidney disease, and some cancers. It’s believed that RDW shows inflammation and oxidative stress.

In summary, understanding RDW is vital in CBC analysis. It offers insights into a patient’s health. By looking at RDW with other blood parameters, doctors can better diagnose and treat patients.

The Relationship Between RDW and the Rule of3

It’s important to know how Red Cell Distribution Width (RDW) and the rule of 3 work together. The rule of 3 helps check if blood test results are right. RDW shows how different red blood cells are in size. Together, they help doctors understand a patient’s health better.

Impact of RDW on Rule of 3 Calculations

RDW can change how the rule of 3 works. A high RDW means red blood cells are more varied in size. This can be a sign of iron deficiency anemia. It can also affect the hemoglobin (Hb) and hematocrit (Hct) values, which are key in the rule of 3.

For example, a high RDW means red blood cells are spread out more. This can make it hard to get the right Hb and Hct values. So, doctors need to think about RDW when using the rule of 3 to get accurate test results.

Using Both Tools for Complete Assessment

Using RDW and the rule of 3 together makes diagnosis better. Here are some reasons why:

• Improved Diagnostic Accuracy: Doctors can spot conditions like anemia or myelodysplastic syndromes more easily.
• Enhanced Patient Care: A full check-up lets doctors make better treatment plans, helping patients get better.
• Better Laboratory Result Interpretation: Using both RDW and the rule of 3 makes sure test results are correct, cutting down on wrong diagnoses.

In short, RDW and the rule of 3 are closely linked and very important. By understanding how RDW impacts the rule of 3 and using both, doctors can give more precise diagnoses. They can also create better treatment plans for patients with blood disorders.

Mean Cell Hemoglobin High: Causes and Significance

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It’s key to know why MCH levels are high and what it means. Mean cell hemoglobin (MCH) is part of a complete blood count (CBC). It shows how much hemoglobin is in each red blood cell on average.

Understanding MCH in Blood Tests

MCH is found by dividing total hemoglobin by the number of red blood cells. It tells us how well blood carries oxygen. Normal MCH values are between 27 to 33 picograms per cell. If it’s not in this range, it might mean there’s a health problem.

When looking at MCH, it’s important to check other blood cell measures too. This includes mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC). Looking at all these together helps doctors find the right diagnosis.

Conditions Associated with Elevated MCH

High MCH can point to several health issues. For example, macrocytic anemia makes red blood cells bigger than usual. This can happen if you don’t get enough vitamin B12 or folate.

• Macrocytic anemia due to vitamin B12 or folate deficiency
• Liver disease
• Alcoholism
• Certain medications that affect DNA synthesis

It’s also possible that high MCH is just a mistake in the lab. So, doctors need to check if the lab results match what’s happening in the body.

Differential Diagnosis of High MCH

Figuring out why MCH is high means looking at many possible causes. Doctors check what you eat, your meds, and if you have any diseases. These can all affect how red blood cells are made and work.

To find out what’s going on, doctors might do more blood tests. They might check for reticulocytes, do a smear test, or test for vitamin B12 and folate. Sometimes, they need to look at the bone marrow to find the cause.

Understanding high MCH helps doctors make better plans for treatment. This can really help patients get better.

Raised MCHC Blood Test: Clinical Implications

An elevated MCHC blood test has many implications for diagnosis and care. MCHC, or Mean Corpuscular Hemoglobin Concentration, is key in a complete blood count (CBC). It shows the average hemoglobin in red blood cells. Knowing its importance helps in diagnosing and treating blood disorders.

Normal Range for MCHC

The normal MCHC range is between 32 and 36 g/dL. This can vary slightly between labs. Values in this range mean the red blood cells have normal hemoglobin levels. We’ll look at what happens when values are outside this range later.

Causes of Elevated MCHC

Several conditions can cause an elevated MCHC. These include hereditary spherocytosis and other hemolytic anemias. Dehydration and lab errors can also raise MCHC. Finding the cause is key to proper treatment.

• Hereditary spherocytosis
• Hemolytic anemias
• Laboratory errors
• Dehydration

Clinical Approach to High MCHC

First, verify a high MCHC result to check for lab errors. A detailed clinical evaluation is needed. This includes looking at the patient’s history and doing a physical exam. More tests, like blood tests or genetic screening, might be needed to find the cause.

“Accurate diagnosis is the cornerstone of effective treatment. A raised MCHC should prompt a thorough clinical assessment to find the underlying cause.”

— Hematology Expert

Elevated RBC in Blood: Causes and Clinical Significance

It’s important to know why a high RBC count happens and what it means. An elevated red blood cell count, or erythrocytosis, can come from many factors. It’s linked to several health conditions.

Physiological Causes of High RBC

There are natural reasons why RBCs might increase. These include:

• High Altitude: At higher elevations, the body makes more RBCs to handle lower oxygen levels.
• Dehydration: Losing water makes RBCs seem more concentrated compared to plasma.
• Exercise: Hard exercise can also boost RBC production.

Pathological Causes of High RBC

Some health issues can also cause an increase in RBCs. These include:

1. Polycythemia Vera: A disorder where the body makes too many RBCs, white blood cells, and platelets.
2. Kidney Disease: Some kidney problems can lead to more RBC production due to increased erythropoietin.
3. Cardiovascular Disease: Heart disease can cause the body to make more RBCs due to chronic low oxygen levels.

Impact on the Rule of 3

The “rule of 3” is used in diagnosing anemia. It looks at RBC count, hemoglobin, and hematocrit levels. An elevated RBC count can change these levels. This might affect how well the rule works for diagnosis.

Understanding why RBCs might be high is key for doctors. It helps them make the right decisions for diagnosis and treatment. By looking at both natural and health-related causes, doctors can better use lab results and the “rule of 3.”

What Does Low RBC Mean: Understanding the Implications

Knowing what a low RBC count means is key to diagnosing and treating health issues. A low red blood cell count, or anemia, stops the body from getting enough oxygen. This affects how well tissues and organs work.

Causes and Factors

Many things can cause a low RBC count. These include:

• Nutritional deficiencies: Not getting enough iron, vitamin B12, or folate can hurt RBC production.
• Chronic diseases: Long-term health issues like chronic kidney disease, rheumatoid arthritis, and cancer can harm RBC production.
• Bleeding: Losing blood due to injury, surgery, or heavy periods can lower RBC count.
• Bone marrow disorders: Diseases like leukemia or aplastic anemia can stop RBC production.

Clinical Manifestations

The signs of a low RBC count can vary. They depend on how low the count is and why. Common signs include:

• Fatigue and weakness
• Shortness of breath
• Dizziness or lightheadedness
• Pale skin

Asa hematologist, notes, “A low RBC count can really affect a person’s life. It makes simple tasks hard because of lack of energy and shortness of breath.”

Effect on the Rule of 3

A low RBC count can mess with the “rule of 3.” This rule helps check if blood test results are right. It says that hemoglobin, hematocrit, and RBC count should be in a certain ratio. If they’re not, it might mean there’s a problem with the test or a health issue.

“The rule of 3 is a valuable tool in hematology, helping clinicians quickly identify possible issues with blood test results. A low RBC count that doesn’t fit the expected ratio may signal an underlying condition that requires further investigation.”

In summary, understanding a low RBC count is vital for doctors to treat anemia well. By knowing the causes, symptoms, and how it affects the “rule of 3,” we can give better care to those with anemia.

Normal Ranges for Red Blood Cell Count

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Knowing the normal range for red blood cell (RBC) count is key for diagnosing health issues. The RBC count is a part of a complete blood count (CBC) test. It shows how well the body carries oxygen to tissues.

Age and Gender Variations

The RBC count changes with age and gender. Adult men usually have more RBCs than women because of testosterone. Children’s counts also change as they grow.

Adult men’s RBC counts are between 4.32 and 5.72 million cells per microliter (μL) of blood. Women’s counts are between 3.90 and 5.03 million cells/μL. Newborns have higher counts that decrease as they get older.

Geographical and Altitude Considerations

Where you live and the altitude also affect RBC counts. At high altitudes, people produce more RBCs to handle lower oxygen levels.

For example, people at high altitudes might have counts that seem high to those at sea level. This is a natural response to less oxygen.

Reference Ranges for Different Populations

Reference ranges for RBC counts can differ among populations. This is due to genetics, environment, and lifestyle. Labs set their own ranges based on the people they test.

Here’s a table showing normal RBC count ranges for different groups:

It’s important to understand these differences for accurate diagnosis and treatment. Healthcare providers need to consider these factors when looking at RBC count results.

Treatment Approaches for Abnormal Blood Parameters

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Treating abnormal blood parameters is key to improving patient health and avoiding complications. Issues like high Red Cell Distribution Width (RDW) or irregular hemoglobin levels need careful management. This includes looking at the Red Blood Cell (RBC) count and other blood tests.

Managing High RDW Conditions

High RDW values show red blood cells of different sizes. This is often due to iron deficiency anemia, vitamin B12 or folate deficiency, and other conditions. To manage high RDW, we do:

• Diagnostic Evaluation: We run more tests to find the cause, like iron studies or vitamin level checks.
• Nutritional Supplementation: We give supplements for iron, vitamin B12, or folate based on the deficiency found.
• Dietary Counseling: We teach patients about diet changes to boost nutrient intake.
• Monitoring: We check blood tests regularly to see how treatment is working.

Treating Anemia Based on RBC Indices

Anemia treatment depends on RBC indices like Mean Corpuscular Volume (MCV), Mean Corpuscular Hemoglobin (MCH), and Mean Corpuscular Hemoglobin Concentration (MCHC). Treatment plans include:

1. Iron Deficiency Anemia: We use iron supplements and suggest dietary changes.
2. Vitamin Deficiency Anemia: We give supplements for the missing vitamin, like B12 or folate.
3. Anemia of Chronic Disease: We focus on managing the chronic condition.

When to Refer to a Hematologist

While primary care doctors can handle many cases, some need a hematologist. This includes:

• Complex or Unresponsive Anemia: Cases that don’t get better with initial treatment or have complex causes.
• Suspected Hematological Disorders: Conditions like leukemia, lymphoma, or myeloproliferative neoplasms.
• Recurrent or Severe Blood Abnormalities: Patients with ongoing or severe issues need specialized care.

By using these treatment methods, healthcare providers can better manage abnormal blood parameters. This improves patient outcomes and quality of life.

Case Studies: The Rule of3 in Clinical Practice

We look at real-life examples to see how the rule of 3 helps in clinical settings. It aids in spotting lab mistakes, finding dehydration, and uncovering anemia. These stories show how the rule of 3 improves patient care and makes diagnoses more accurate.

Identifying Laboratory Error

A 45-year-old man came in feeling tired and weak. His first lab results showed an RBC count of 4.5 million cells/μL, Hb of 13.5 g/dL, and Hct of 40%. Using the rule of 3, we saw a small difference between Hb and Hct. But, the RDW was high at 16%, hinting at a problem.

Further checks found a lab mistake in the RBC count. Fixing this error changed the diagnosis and treatment plan.

This case shows how a high RDW led to finding a lab mistake. It could have caused a wrong diagnosis if not caught.

Detecting Dehydration

A 70-year-old woman was admitted for severe dehydration. Her lab results showed an RBC count of 5.5 million cells/μL, Hb of 17 g/dL, and Hct of 52%. The rule of 3 showed Hb and Hct were close, but the RDW was normal. This suggested dehydration, confirmed by her symptoms.

Fluid resuscitation helped bring her blood values back to normal. The rule of 3 helped gauge dehydration’s severity and treatment success.

Uncovering Underlying Anemia

A 30-year-old woman had symptoms of anemia. Her lab results showed an RBC count of 3.8 million cells/μL, Hb of 10 g/dL, and Hct of 30%. The rule of 3 showed Hb and Hct were consistent. But, her RDW was high at 18%, pointing to iron deficiency anemia.

Red cell distribution width interpretation was key in diagnosing her anemia. More tests confirmed iron deficiency, and treatment began.

These examples show the rule of 3’s value in clinical practice. It helps avoid lab mistakes, spot dehydration, and find anemia. By using this rule, doctors can make better decisions and care for patients more effectively.

Conclusion

We’ve looked into the rule of3 for anemia and its link to blood parameters like RDW. This rule is simple yet powerful for checking anemia. It looks at red blood cell count, hemoglobin, and hematocrit.

A high RDW means red blood cells are not all the same size. This could point to a health issue. Knowing how to read RDW is key to spotting and treating anemia.

By using the rule of3 with RDW, doctors can make better diagnoses. This helps in creating effective treatment plans. So, the rule of3, along with RDW and other blood tests, is very important in healthcare.

In short, the rule of3 for anemia, along with RDW and other blood tests, is key in making medical decisions. Understanding these helps doctors give better care and improve patient results.

FAQ

What is the “rule of3” in anemia, and how is it used in clinical practice?

The “rule of3” is a simple rule in labs. It says that hemoglobin (g/dL) is about three times the RBC count (in millions/μL). Also, the hematocrit (%) is about three times the hemoglobin. It helps doctors quickly check if lab results are right and helps in diagnosing anemia.

What does a high Red Cell Distribution Width (RDW) indicate?

A high RDW means there’s a big difference in red blood cell size. This can point to anemia, heart disease, or other blood disorders.

How does the “rule of3” help in detecting laboratory errors or abnormalities?

The “rule of3” helps doctors spot lab mistakes or odd results. It shows big differences in RBC count, hemoglobin, and hematocrit. This might mean the cells are not normal, there’s a lab error, or fluid balance is off.

What are the causes of elevated Mean Cell Hemoglobin (MCH)?

High MCH can be due to many things. This includes big red blood cells, not enough vitamin B12 or folate, and some medicines.

What is the normal range for Mean Corpuscular Hemoglobin Concentration (MCHC)?

MCHC usually ranges from 32-36 g/dL. But, this can change based on the lab, age, sex, and other factors.

How does a high RBC count affect the “rule of3”?

A high RBC count can mess with the “rule of3”. It changes the expected ratio between RBC count, hemoglobin, and hematocrit. This might show problems like too many red blood cells.

What are the common causes of low RBC count?

Low RBC count can be caused by many things. This includes anemia, losing blood, not getting enough iron, vitamin B12, or folate, and chronic diseases.

How do age, gender, geography, and altitude affect RBC count reference ranges?

RBC count ranges can change with age, sex, where you live, and altitude. For example, men usually have more RBCs than women, and at high altitudes, there’s less oxygen.

When should a patient be referred to a hematologist for abnormal blood parameters?

If blood tests show big problems like anemia, high RDW, or odd RBC counts, see a hematologist. They can give special care and help manage these issues.

How is high RDW managed, and what are the treatment approaches for underlying conditions?

To handle high RDW, find and fix the cause. This could be iron deficiency anemia, vitamin B12 or folate lack, or other blood issues. Treatment might include supplements, medicines, or other steps.

References

• American Society of Hematology (ASH): https://www.hematology.org/education/patients/anemia
• Empendium (MCM Textbook): https://empendium.com/mcmtextbook/chapter/B31.II.15.1.
• NCBI Bookshelf (StatPearls – Complete Blood Count): https://www.ncbi.nlm.nih.gov/books/NBK565880/
• Wikipedia (Complete Blood Count): https://en.wikipedia.org/wiki/Complete_blood_count
• YouTube (Video – Blood Test Interpretation): https://www.youtube.com/watch?v=dCJWaJrZSBA