Kidney Function Test
Creatinine, eGFR, urea and electrolytes — the standard kidney markers.
A kidney function test measures how well your kidneys are filtering waste. The standard panel includes creatinine, eGFR (estimated glomerular filtration rate), urea and electrolytes such as sodium and potassium.
What it measures
Creatinine
eGFR
Urea
Sodium & potassium
Why it matters
- Chronic kidney disease is often silent until later stages — early detection is valuable.
- Hydration, diet and certain medications can affect kidney markers.
- Anyone with diabetes, high blood pressure or a family history should consider periodic testing.
How testing works
- Order a kidney function panel as a finger-prick home kit or clinic blood draw.
- Stay normally hydrated in the 24 hours before testing — avoid heavy protein loads or supplements.
- Results are typically returned in 2–4 working days.
Compare Kidney Function Test prices in the UK
Side-by-side comparison of CQC-regulated providers and UKAS-accredited laboratories. Transparent pricing, typical turnaround times and sample methods.
Frequently asked questions
What is a normal eGFR?
An eGFR of 90 mL/min/1.73m² or above is generally considered normal for adults. Values between 60–89 may be normal depending on age; below 60 for 3 months or more meets the definition of chronic kidney disease.
Can dehydration affect kidney results?
Yes — mild dehydration can raise creatinine and urea temporarily. Test when normally hydrated for the most representative result.
Related guides
This guide is for general information only and does not constitute medical advice. Always discuss test results with a qualified clinician.