What characteristics does an abnormal kidney function test have?

Answer 1

An abnormal kidney function test means one or more test results fall outside the normal range, suggesting the kidneys may not be filtering blood or maintaining fluid and electrolyte balance properly.

But a single abnormal result does not always mean kidney disease. Results should be interpreted alongside symptoms, medical history, and repeat testing if needed.

Common abnormal findings include:

• Elevated serum creatinine: May indicate reduced kidney filtration, although muscle mass, dehydration, and certain medications can also affect levels.
• Low estimated glomerular filtration rate (eGFR): An eGFR below 60 mL/min/1.73 m² for at least three months may suggest chronic kidney disease.
• High blood urea nitrogen (BUN): Can occur with kidney dysfunction but may also rise due to dehydration, a high-protein diet, or gastrointestinal bleeding.
• Protein (albumin) in the urine: Persistent proteinuria is often an early sign of kidney damage.
• Blood in the urine (hematuria): May be caused by kidney disease, urinary tract infections, kidney stones, or other conditions.
• Abnormal electrolyte levels: Changes in potassium, sodium, bicarbonate, or phosphorus can occur when kidney function declines.

If kidney function tests are abnormal, a healthcare provider may recommend repeat blood and urine tests, imaging studies, or referral to a kidney specialist (nephrologist) to determine the underlying cause and appropriate treatment.

Answer 2

Low clearance values for creatinine and urea indicate diminished ability of the kidneys to filter these waste products from the blood and excrete them in the urine. As clearance levels decrease, blood levels of creatinine and.