Estimated Glomerular Filtration Rate

eGFR Blood Test | Kidney Function | London Blood Tests

Assess kidney function with our eGFR blood test for £38. UKAS-accredited testing, fast results, and optional GP consultation available.

The Estimated Glomerular Filtration Rate (eGFR) Test assesses how well your kidneys are filtering waste from the blood. It is a key marker for detecting and monitoring chronic kidney disease (CKD). Testing is carried out in a UKAS-accredited laboratory, with fast turnaround times and an optional GP consultation.

What is an eGFR Blood Test?

The Estimated Glomerular Filtration Rate (eGFR) is a calculated value that reflects how efficiently your kidneys filter blood through the glomeruli. It is derived from serum creatinine levels and adjusted for age, sex, and body size.

eGFR is one of the most widely used indicators of kidney function and is essential for identifying early-stage kidney disease — often before symptoms appear. It is routinely used to:

• Screen for chronic kidney disease

• Monitor kidney function over time

• Guide medication dosing

• Assess cardiovascular and metabolic risk

At London Blood Tests, eGFR is calculated using validated formulas aligned with UK clinical guidelines, ensuring reliable and consistent results.

Benefits of the eGFR Test

1. Early Detection of Kidney Disease
   Identifies reduced kidney function before symptoms develop.

2. Monitors Kidney Health Over Time
   Tracks changes in kidney filtration and disease progression.

3. Guides Medication Safety
   Essential for dosing drugs cleared by the kidneys.

4. Supports Chronic Disease Management
   Important for people with diabetes, hypertension, or cardiovascular disease.

5. Non-Invasive and Accessible
   Requires only a standard blood test.

6. Predicts Cardiovascular Risk
   Reduced eGFR is linked to higher cardiovascular disease risk.

7. Optional GP Consultation for Interpretation
   Results can be reviewed with a GP to determine next steps.

Why Do I Need an eGFR Blood Test?

You may benefit from an eGFR test if you:

• Have diabetes or high blood pressure

• Have a family history of kidney disease

• Are taking long-term medications

• Are over the age of 60

• Have abnormal creatinine results

• Want routine kidney health screening

Symptoms that may prompt testing include:

• Fatigue or weakness

• Swelling in ankles, feet, or face

• Changes in urination

• Foamy urine

• Shortness of breath

Because early kidney disease is often silent, eGFR testing plays a vital role in preventive care.

How the Test Works

In-Clinic Testing at London Blood Tests

1. Book Your Appointment

   • Book online or by phone at your chosen clinic.

   • No fasting required.

2. Pre-Test Review

   • Inform the clinician about medications or recent illness.

3. Sample Collection

   • A trained phlebotomist collects a venous blood sample.

   • Takes approximately 5–10 minutes.

4. Laboratory Analysis

   • Sample analysed in a UKAS-accredited laboratory for creatinine.

5. eGFR Calculation

   • eGFR is calculated using validated equations.

6. Results Delivery

   • Results typically available within 1–2 business days.

7. Optional GP Consultation

   • Review kidney health and next steps with a GP.

At-Home Blood Draw (Home or Hotel Phlebotomy – UK-Wide)

1. Book Your Visit

   • Arrange a phlebotomist home or hotel visit at a suitable time.

2. Professional Collection

   • Certified phlebotomist collects a venous blood sample.

3. Secure Transport

   • Sample couriered same day to the laboratory.

4. Laboratory Testing

   • Analysis identical to clinic testing.

5. Results & Follow-Up

   • Results delivered online, GP review optional.

Your eGFR Test Results – Explained

eGFR is reported in mL/min/1.73m².

UK-standard interpretation:

• ≥90: normal kidney function

• 60–89: mildly reduced (may be normal with ageing)

• 45–59: mild to moderate reduction (CKD stage 3a)

• 30–44: moderate to severe reduction (CKD stage 3b)

• 15–29: severe reduction (CKD stage 4)

• <15: kidney failure (CKD stage 5)

Results should be interpreted alongside creatinine, urine albumin, and clinical history.