Checking Kidney Health With Blood and Urine Tests

What Kidney Tests Measure

The kidneys remove waste and extra fluid from the blood. Two blood markers, creatinine and blood urea nitrogen, reflect how well they are filtering. A calculation based on creatinine, age, and sex produces an estimated filtration rate, often called eGFR.

Urine tests add another angle. They can detect protein or albumin leaking into urine, which can be an early sign of kidney damage.

Common Kidney Tests

• Creatinine: a waste product that rises when filtration drops.
• Blood urea nitrogen: another waste marker affected by diet and hydration.
• eGFR: an estimate of filtering capacity.
• Urine albumin: checks for protein leakage.
• Urine albumin-to-creatinine ratio: adjusts urine protein for concentration.

Who Should Check Kidney Function

People with diabetes or high blood pressure face the highest risk and are often advised to test regularly. Other risk factors include heart disease, a family history of kidney failure, obesity, and long-term use of certain medicines. Because early kidney disease usually has no symptoms, testing is the way to catch it.

How to Order and Where to Get Tested

Kidney tests are available through direct-access labs. A blood draw covers creatinine and blood urea nitrogen, while a urine sample covers albumin and related markers. Order online and visit a patient service center.

At our partner lab, a kidney health test starts near $59, a renal function panel near $49, a creatinine urine test near $45, and an albumin-to-creatinine ratio near $45. Results often arrive within one to two business days.

How Much Does It Cost

Kidney testing is affordable. A basic kidney health panel starts near $59 and a renal function panel near $49. Urine-based tests start near $45. A comprehensive metabolic panel, which includes creatinine and blood urea nitrogen, starts near $39 and adds other markers.

Confirm any draw fee before you order.

Protecting Kidney Health

Control of blood sugar and blood pressure is the strongest protection for the kidneys. Staying hydrated, limiting excess salt, avoiding unnecessary anti-inflammatory medicines, and not smoking also help. If a test shows reduced function or protein in the urine, work with a clinician on monitoring and treatment.

Stages of Kidney Function and Follow-Up

Kidney function is often described in stages based on the estimated filtration rate. Early stages may need only monitoring and control of blood pressure and blood sugar. Later stages can require more frequent testing, dietary changes, and specialist care. A staging label helps clinicians plan, but it is not a prediction of how you will feel.

Urine protein is tracked alongside filtration. Even with a normal filtration rate, protein in the urine signals early stress and calls for closer attention. That is why both a blood and a urine test often appear in a kidney workup.

Blood pressure is a major driver of kidney change. Keeping it in range protects the kidneys over the long term, sometimes more than any single lab value.

Protecting Your Kidneys Daily. Keep blood pressure and blood sugar in your target range, since those are the biggest levers.

• Control blood pressure and blood sugar.
• Stay hydrated and limit excess salt.
• Check before using kidney-stressing medicines.
• Avoid smoking.

Check with a clinician before using medicines that can stress the kidneys, including some pain relievers. If a test changes, bring your history to the visit so the trend is clear.

Kidney tests are most useful when paired. A blood test shows how well the kidneys filter, while a urine test shows whether protein is leaking. Looking at both gives a clearer picture than either alone.

• Do both blood and urine tests.
• Track blood pressure at home.
• Note any new medicines.
• Keep a history of results.

If a kidney value changes, ask whether it should be confirmed with a repeat and a urine test. A single reading can shift with hydration or a new medicine, while two tests plus a urine check give a reliable picture. Early changes are often manageable with blood pressure and blood sugar control.

• Repeat an abnormal blood test.
• Add a urine protein test.
• Check blood pressure at home.
• Review medicines with a clinician.
• Keep a history of results.

Keep a record of blood pressure readings alongside your kidney results. The two together show how well your plan is protecting kidney function over time.

• Check blood pressure regularly.
• Note any new medicines.
• Track fluid and salt intake.