Care for Impaired Kidney Function

If you have recently learned that your kidney function is reduced, it is natural to feel worried. The good news is that impaired kidney function is common, manageable, and often slow to change when it is watched closely. With regular monitoring and the right treatment plan, many people protect their kidney health for years. This page explains what impaired kidney function means, how it is measured, and how nephrologists work to keep your kidneys healthy for as long as possible.

What "impaired kidney function" means

Your kidneys are two bean-shaped organs that filter waste and extra fluid from your blood, balance minerals, and help control blood pressure. When they cannot do this as well as they should, doctors call it impaired or reduced kidney function.

Two terms come up often:

• Acute kidney injury (AKI) is a sudden drop in kidney function, often over hours or days. It can be triggered by infection, dehydration, certain medicines, or a blockage. AKI is sometimes reversible once the cause is treated.
• Chronic kidney disease (CKD) is a gradual loss of kidney function over months or years. CKD is long-lasting and is described in stages.

CKD is grouped into five stages based on your eGFR, a number that estimates how well your kidneys filter:

• Stage 1 – normal eGFR (90 or above) with signs of kidney damage, such as protein in the urine.
• Stage 2 – mildly reduced function (eGFR 60–89) with signs of damage.
• Stage 3 – moderately reduced function (eGFR 30–59).
• Stage 4 – severely reduced function (eGFR 15–29).
• Stage 5 – kidney failure (eGFR below 15), when extra treatment such as dialysis or transplant may be considered.

Knowing your stage helps your care team choose the right monitoring and treatment for you.

Why it matters (even when you feel fine)

One of the trickiest things about kidney disease is that it is often silent in the early stages. The kidneys have a large reserve, so they can lose a fair amount of function before you notice any symptoms. Many people feel completely well even when their eGFR has dropped.

This is exactly why testing matters. Catching reduced kidney function early gives you and your nephrologist the best chance to find the cause, protect the function you still have, and lower related risks such as heart and blood vessel problems. Waiting for symptoms means missing the window when treatment works best.

When symptoms do appear later, they can include swelling in the legs or ankles, fatigue, changes in how much you urinate, trouble concentrating, or poor appetite. If you notice these, it is worth mentioning them, but you should not wait for them to seek care.

How we evaluate kidney function

Nephrologists use a few straightforward tests to build a clear picture of your kidney health:

• Blood tests. A blood test measures creatinine, a waste product your kidneys clear. The lab uses the result to estimate your eGFR, the main number used to estimate filtering and assign a CKD stage.
• Urine tests. Checking the urine for protein (often a test called the urine albumin-to-creatinine ratio) and for blood helps detect kidney damage early, sometimes before eGFR changes. Our team can help with the evaluation of protein and blood in the urine.
• Imaging. An ultrasound or other scan can show the size and shape of the kidneys and check for blockages, stones, or cysts.
• Kidney biopsy. In some cases, a small tissue sample is taken to identify the exact cause of kidney damage. This is not needed for everyone.

Because eGFR can shift with hydration and illness, your nephrologist looks at trends over time rather than a single result.

Treating and slowing kidney disease

Treatment focuses on protecting the kidneys you have and managing the conditions that affect them. Care is always tailored to you, but it often combines healthy habits with medical management.

Lifestyle steps that frequently help include:

• Eating a balanced, lower-salt diet, sometimes with guidance from a dietitian.
• Staying active, reaching a healthy weight, and not smoking.
• Drinking enough fluids and being cautious with over-the-counter pain relievers such as NSAIDs, which can stress the kidneys.

Medical management often focuses on the root causes. Keeping blood pressure and blood sugar in a healthy range is one of the most powerful ways to protect the kidneys, so closely related services include care for hypertension and care for diabetic kidney disease. Nephrologists may also prescribe medicines shown to slow kidney decline, review your current prescriptions, and treat complications that can come with CKD, such as anemia and changes in bone health. By acting early and steadily, the aim is to slow progression and delay or avoid the need for dialysis.

When to see a nephrologist

A nephrologist is a doctor who specializes in kidney care. Your primary doctor may refer you, or you can ask for a referral, if you have:

• An eGFR that is low or falling over time.
• Protein or blood found in your urine.
• High blood pressure that is hard to control.
• Diabetes, which is a leading cause of kidney disease.
• A family history of kidney disease, including polycystic kidney disease.

Seeing a specialist early, while you still feel well, gives you the most options and the best chance to keep your kidneys working.

Impaired kidney function is something you do not have to face alone. With regular checkups, clear information, and a plan built around your needs, most people are able to stay active and protect their kidney health for the long term. Whatever stage you are at, our team is here to guide you every step of the way.