science Lab Test

Kidney Function Tests: What Your Results Mean

Kidney function tests assess how well your kidneys are filtering waste from the blood. The kidneys are vital for maintaining fluid balance, electrolyte levels, blood pressure, and excreting waste products. Early kidney disease often has no symptoms — blood tests are the primary way to detect problems.

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What It Tests

Creatinine, BUN (Blood Urea Nitrogen), eGFR (estimated Glomerular Filtration Rate), uric acid, and electrolytes (sodium, potassium, chloride).

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Why It's Ordered

Kidney function tests are ordered to detect chronic kidney disease, monitor kidney health in diabetics and hypertensives, assess medication safety, and evaluate hydration status.

Markers in This Test

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Creatinine

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Frequently Asked Questions

What is eGFR and what does it mean? expand_more

eGFR (estimated Glomerular Filtration Rate) estimates how many milliliters of blood your kidneys filter per minute. Normal is above 60. Below 60 for 3+ months indicates chronic kidney disease.

What are early signs of kidney disease? expand_more

Kidney disease is often "silent" — detected only through blood and urine tests. Later symptoms include swelling in legs and feet, fatigue, high blood pressure, and changes in urination.

Can kidney disease be reversed? expand_more

Acute kidney injury can often be reversed with treatment. Chronic kidney disease cannot be reversed but can be slowed with blood pressure control, diabetes management, and a kidney-friendly diet.

What foods protect kidney health? expand_more

Staying well hydrated, reducing sodium and processed foods, limiting red meat, controlling blood sugar and blood pressure, and avoiding NSAIDs long-term all protect kidney function.

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