What Blood Test Tests Your Kidneys?

The blood test that tests your kidneys is called a renal function panel, which measures key markers like estimated glomerular filtration rate (eGFR), serum creatinine, and blood urea nitrogen (BUN). These values help your healthcare provider assess how well your kidneys filter waste and maintain fluid balance. At anylabtests.com, we offer convenient, lab-certified testing to give you clear insights into your kidney health.

Understanding Kidney Function Tests

Kidney function tests are a group of blood and urine tests that evaluate the health of your kidneys. The most common blood tests include:

• Serum Creatinine – A waste product from muscle metabolism; high levels indicate reduced kidney filtration.
• Blood Urea Nitrogen (BUN) – Measures urea, a waste product from protein breakdown; elevated BUN can signal kidney issues.
• Estimated Glomerular Filtration Rate (eGFR) – Calculated from creatinine, age, sex, and race; eGFR below 60 mL/min/1.73m² for 3+ months suggests chronic kidney disease.
• Electrolytes – Sodium, potassium, calcium, and phosphate levels help detect imbalances due to kidney dysfunction.

The Key Markers: eGFR, Creatinine, and BUN

While many markers exist, eGFR is considered the gold standard for kidney function assessment. Creatinine and BUN provide complementary information. For example, a high BUN-to-creatinine ratio may point to dehydration or gastrointestinal bleeding, not necessarily kidney disease. Today, updated guidelines from the National Kidney Foundation emphasize using cystatin C-based eGFR for more accurate results in certain populations, such as the elderly or those with low muscle mass.

How to Interpret Your Results

Your kidney test results are compared to reference ranges established by clinical laboratories. It is important to note that normal ranges can vary slightly between labs. Below is a typical reference table for a standard renal panel:

Normal Ranges for Kidney Function

Always discuss your results with a healthcare professional. A single abnormal value does not necessarily mean kidney disease; trends over time are more important. For instance, a gradual decline in eGFR over months or years is a stronger indicator of chronic kidney disease than one low reading.

Why Testing Matters (Update)

Kidney disease often has no symptoms until advanced stages. Early detection through blood tests can slow progression and prevent complications like cardiovascular disease, anemia, and bone disorders. Today, the U.S. Preventive Services Task Force continues to recommend regular kidney function screening for adults with risk factors such as diabetes, hypertension, or a family history of kidney failure. At anylabtests.com, we make it easy to monitor your kidney health from the comfort of your home with our physician-reviewed Renal Function Panel.

Ordering is simple: no insurance needed, and you get confidential results online within days. Whether you need a baseline check or ongoing monitoring, our tests are processed in CLIA-certified labs and backed by clinical support.

Ready to check your kidney health? Order our comprehensive Renal Function Panel at anylabtests.com/go/kidney-test today.