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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Determining whether kidney problems are present involves a series of straightforward medical steps. Diagnosis aims to identify the problem’s type and severity, not just whether it exists. Because symptoms can be vague or absent, doctors rely heavily on tests to obtain a clear picture of what is happening inside the body. This process is a standard part of care for anyone living with HIV. The evaluation is thorough and designed to rule out other potential causes of kidney disease. By gathering data from different sources—your history, your blood, and your urine—doctors can build a complete profile of your kidney health. This section outlines the typical journey of diagnosis, explaining what each test involves and why it is necessary.
The diagnostic process begins with a conversation. Your healthcare provider will ask detailed questions about your health history. They will want to know about any family history of kidney disease, as genetics can play a large role. They will also review your current medications, looking for any drugs that might be affecting your kidneys. They will ask about your history with the virus, including your CD4 counts and viral load over time, to understand your immune health.
Following the conversation, a physical exam is performed. This is not painful or invasive. The doctor will monitor your blood pressure, as high blood pressure is both a cause and a symptom of kidney issues. They will listen to your heart and lungs to check for fluid buildup. They will also examine your legs and ankles to look for signs of swelling (edema).
Urine tests are the cornerstone of kidney diagnosis. They are simple, noninvasive, and provide a wealth of information. You will be asked to provide a urine sample in a clean cup. This sample is then analyzed in a lab. The most important thing doctors look for is protein. As discussed earlier, protein should stay in the blood. If it is in the urine, it indicates the filters are damaged.
The first step is often a “dipstick” test. A chemically treated strip of paper is dipped into the urine. It changes color if it detects abnormalities like blood, infection, or protein. This device gives an immediate, rough estimate of kidney health. It is a quick screening tool used in almost every clinic visit.
For a more precise measurement, the lab calculates the albumin-to-creatinine ratio. Albumin is a specific type of protein. Creatinine is a waste product. By comparing the amount of albumin to the amount of creatinine in the same sample, doctors can estimate exactly how much protein is leaking over a 24-hour period. This number helps determine the severity of the kidney damage.
Blood tests go hand-in-hand with urine tests. While urine tells us what is leaking out, blood tests tell us what is staying in. If the kidneys are not filtering waste, levels of certain chemicals in the blood will rise. The most common marker measured is creatinine. Creatinine is a waste product that comes from normal muscle wear and tear. Since your muscles produce it at a steady rate, your kidneys should filter it out at a steady rate. High blood creatinine levels indicate that the kidneys are not eliminating it quickly enough.
Using the creatinine level, age, gender, and sometimes race, doctors calculate the Estimated Glomerular Filtration Rate (eGFR). The eGFR is essentially a percentage of kidney function. An eGFR of 90 or above is considered normal. As the number drops, it indicates reduced kidney function. This number is the main way doctors track the stage of kidney disease. It is a calculated estimate, but it is very useful for monitoring changes over time.
Sometimes, doctors need to “see” the kidneys to understand what is going on. The most common imaging test used is an ultrasound. An ultrasound is the same technology used to look at babies during pregnancy. It uses sound waves to create a picture of the internal organs. It is completely safe, uses no radiation, and is painless. Gel is applied to the skin, and a wand is moved over the kidney area.
The ultrasound can show the size and shape of the kidneys. In many chronic kidney diseases, kidneys shrink and become small. However, in HIV-associated nephropathy, the kidneys often remain normal in size or even become larger and brighter on the screen due to inflammation. This specific appearance can be a strong clue for the diagnosis.
Imaging is also used to rule out other problems. It can show if there are kidney stones blocking the flow of urine. It can also detect cysts or masses that might be causing symptoms. By ensuring there isn’t a physical blockage, doctors can be more confident that the issue lies within the kidney tissue itself.
If blood and urine tests point to significant kidney damage, but the exact cause is unclear, a kidney biopsy may be recommended. A biopsy is the only way to get a definitive diagnosis. It involves taking a tiny sample of kidney tissue to examine under a microscope. This allows doctors to see the cells directly and identify the specific pattern of scarring or inflammation.
The procedure is done in a hospital, usually as an outpatient service. You will lie on your stomach, and the doctor will use local anesthesia to numb the skin on your back. Using ultrasound for guidance, they insert a thin needle into the kidney to retrieve the sample. You might feel some pressure, but it should not be painful. Afterward, you will need to lie still for a few hours to ensure there is no bleeding. The tissue is then sent to a pathologist who looks for the classic collapsing pattern of filters seen in this specific condition.
Receiving test results can be anxiety-inducing, but understanding what they mean empowers you. Your doctor will look at all the data together. A single high creatinine number might be due to dehydration, but a consistently high number suggests kidney disease. They will look for trends—is the function stable, or is it declining?
They will also classify the stage of the disease based on the eGFR.
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A kidney biopsy is generally safe. The main risk is bleeding, but serious complications are rare. You are monitored closely afterward to ensure safety.
For blood tests, you often do not need to fast, but speak with your doctor. For an ultrasound or biopsy, specific instructions about food and water will be given to you.
Yes. You can have a normal filtration rate (eGFR) but still have protein in your urine. This type of condition is why both urine and blood tests are necessary.
If you have kidney issues, you might need tests every 3 to 6 months. If your results are stable, testing might be done once a year.
The needle used is delicate, so the mark left on your skin is tiny, usually smaller than a freckle, and fades over time.
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