Nephrology focuses on diagnosing and treating kidney diseases. The kidneys filter waste, balance fluids, regulate blood pressure, and manage acute and chronic conditions.
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The decision to initiate renal replacement therapy is never made lightly. It is the result of a comprehensive diagnostic process that evaluates not just the kidneys but the entire patient. This evaluation involves a series of tests designed to measure exactly how much function the kidneys have lost and to identify any reversible factors that might delay the need for replacement. The process also includes assessing the patient’s readiness—both physical and mental—for the rigorous treatments ahead.
Doctors use a combination of laboratory data, imaging studies, and physical examinations to build a complete picture. This evaluation is also used to determine which type of replacement therapy is best suited for the individual. For example, a patient with severe heart disease might be evaluated differently than a young patient with no other health issues. This section outlines the steps doctors take to confirm the diagnosis of end-stage renal disease and prepare the patient for the next chapter of their health journey.
The cornerstone of diagnosis is the blood test. Doctors look specifically at two waste products: creatinine and blood urea nitrogen.
Creatinine is a chemical waste molecule that is generated from muscle metabolism. Healthy kidneys filter creatinine out of the blood. When kidneys fail, creatinine levels rise. Doctors use the creatinine level, along with age, gender, and sometimes weight, to calculate the estimated glomerular filtration rate (eGFR). This number represents the percentage of kidney function remaining. When the eGFR drops below 15, the patient is diagnosed with kidney failure, and evaluation for replacement becomes urgent.
Blood tests also check for dangerous imbalances. High potassium levels are a sign that the kidneys are failing to regulate heart-critical minerals. Low bicarbonate levels indicate that the blood is becoming too acidic, a condition called metabolic acidosis. These chemical red flags help doctors decide if replacement therapy needs to start immediately to prevent a medical emergency.
Kidney failure places immense strain on the heart. Before starting replacement therapy, especially transplantation, a thorough heart check is mandatory.
An echocardiogram is an ultrasound of the heart. It checks how well the heart is pumping and if the heart muscle has thickened due to high blood pressure. It also looks for fluid around the heart, a condition called pericardial effusion, which can be caused by uremia.
For patients considering a transplant, a stress test is often performed to ensure the heart is strong enough to withstand surgery. This helps the medical team manage any heart risks before the major procedure of placing a new kidney.
The cornerstone of diagnosis is the blood test. Doctors look specifically at two waste products: creatinine and blood urea nitrogen.
Creatinine is a chemical waste molecule that is generated from muscle metabolism. Healthy kidneys filter creatinine out of the blood. When kidneys fail, creatinine levels rise. Doctors use the creatinine level, along with age, gender, and sometimes weight, to calculate the estimated glomerular filtration rate (eGFR). This number represents the percentage of kidney function remaining. When the eGFR drops below 15, the patient is diagnosed with kidney failure, and evaluation for replacement becomes urgent.
Blood tests also check for dangerous imbalances. High potassium levels are a sign that the kidneys are failing to regulate heart-critical minerals. Low bicarbonate levels indicate that the blood is becoming too acidic, a condition called metabolic acidosis. These chemical red flags help doctors decide if replacement therapy needs to start immediately to prevent a medical emergency.
Kidney failure places immense strain on the heart. Before starting replacement therapy, especially transplantation, a thorough heart check is mandatory.
An echocardiogram is an ultrasound of the heart. It checks how well the heart is pumping and if the heart muscle has thickened due to high blood pressure. It also looks for fluid around the heart, a condition called pericardial effusion, which can be caused by uremia.
For patients considering a transplant, a stress test is often performed to ensure the heart is strong enough to withstand surgery. This helps the medical team manage any heart risks before the major procedure of placing a new kidney.
For patients who are candidates for a kidney transplant, the evaluation is much more extensive. This process is often called “the workup.”
It involves testing the patient’s tissue type and blood type to match them with a potential donor. It also includes screening for infections like HIV and hepatitis, as well as checking for cancer. Since transplant patients must take immunosuppressing drugs, doctors must ensure there are no hidden infections or cancers that could flare up once the immune system is dampened. This workup also involves meeting with a social worker and a financial counselor to ensure the patient has the support system and resources needed for post-transplant care.
Surprisingly, dental health is a key part of the evaluation. Infections in the mouth can spread to the bloodstream and infect a new kidney or a dialysis catheter.
Patients must have a dental exam and have any cavities or gum disease treated before being cleared for a transplant. Similarly, a social evaluation assesses the patient’s living situation. Do they have a clean place to do home dialysis? Do they have transportation to the clinic? Do they have family support? These social factors are just as important as the medical ones in determining the success of renal replacement therapy.
During the evaluation phase, blood pressure is monitored closely. High blood pressure is a key indicator of fluid overload.
Doctors will look at trends in blood pressure to determine “dry weight,” which is the patient’s ideal weight without excess fluid. This number becomes a critical target once dialysis begins. Establishing this baseline helps the care team know exactly how much fluid needs to be removed during treatments.
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An eGFR below 15 usually indicates kidney failure. This is the stage where doctors will start preparing you for dialysis or a transplant.
Bacteria in the mouth can travel through the blood and cause serious infections, especially when your immune system is weak from kidney disease or transplant medications.
No, the ultrasound is painless. It involves a technician moving a smooth probe over your belly or back to take pictures.
The transplant evaluation can take a few months to complete all necessary tests, scans, and appointments for placement on the waiting list.
Yes, ask your doctor early. Not everyone is a candidate, but many are. The evaluation will look at your home environment and your ability to care for yourself.
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