Kidney Function Test
Feb 8, 2026
Kidney Function Test
A kidney function test measures creatinine, urea, and calculates eGFR (estimated glomerular filtration rate) to assess how effectively your kidneys are filtering waste from your blood—crucial because chronic kidney disease affects 1 in 10 people and typically causes no symptoms until significantly advanced. Early detection through testing can prevent progression to kidney failure.
At Blood Test London, kidney function testing costs from £245 with results in 2-3 days.
What Does a Kidney Test Measure?
Marker | What It Shows | Normal Range |
|---|---|---|
Creatinine | Muscle waste product filtered by kidneys | 60-110 μmol/L (men), 45-90 (women) |
Urea | Protein waste product | 2.5-7.8 mmol/L |
eGFR | Estimated kidney function | Above 90 mL/min/1.73m² |
Electrolytes | Sodium, potassium balance | Various |
Understanding eGFR
eGFR | Kidney Function |
|---|---|
90+ | Normal |
60-89 | Mildly reduced |
45-59 | Moderately reduced |
30-44 | Moderately to severely reduced |
15-29 | Severely reduced |
<15 | Kidney failure |
Risk Factors for Kidney Disease
Diabetes
High blood pressure
Heart disease
Family history of kidney disease
Age over 60
Obesity
Regular NSAID use (ibuprofen, etc.)
Smoking
How to Protect Your Kidneys
Control blood pressure (below 140/90, ideally 120/80)
Manage blood sugar if diabetic
Stay hydrated (but don't overdo it)
Limit salt intake
Avoid excessive NSAIDs
Don't smoke
Maintain healthy weight
Book Your Kidney Test
Price: From £245 | Results: 2-3 days | Doctor review: A doctor always reviews every result
Blood Test London by The Wellness. Kidney function testing from £245.