Estimated Glomerular Filtration Rate
Private eGFR blood test in London for £38, providing one calculated kidney-filtration marker with results expected in around 1–2 business days.
Turnaround time
1-2 business days
Biomarkers count
1
Book your test
Choose Service Type
Professional phlebotomist comes to you
+ £{{ home_visit_fee }}
Visit our clinic for your test
{{ clinic_visit_fee > 0 ? '+ £' + clinic_visit_fee : 'Free' }}
Home Visit Details
Home visits require at least 24 hours notice.
Select a clinic: Sorting by distance…
{{ clinicAddress(clinic) }}
{{ clinicAddress(selectedClinic) }}
Select a date
Select an hour
Available time slots: {{ timeSlots.length}}
Overview of the Estimated Glomerular Filtration Rate
The Estimated Glomerular Filtration Rate test provides a calculated estimate of how effectively the kidneys are filtering blood.
The test contains 1 biomarker: Estimated Glomerular Filtration Rate (eGFR).
The kidneys contain millions of microscopic filtering units called glomeruli.
Glomerular filtration rate describes how much plasma is filtered through these structures over time.
Direct measurement of GFR is complex, so routine healthcare normally uses eGFR, calculated from serum Creatinine together with demographic information included in the validated equation.
The result is generally reported in mL/min/1.73 m², standardised to a body-surface area of 1.73 square metres.
A lower eGFR suggests reduced kidney filtration.
However, one reduced value does not automatically mean chronic kidney disease.
CKD is generally established when reduced kidney function or another marker of kidney damage persists for at least three months.
Temporary reductions can occur during dehydration, acute illness and acute kidney injury.
Creatinine-based eGFR also has limitations.
Very high or very low muscle mass, severe malnutrition, amputation and substantial creatine supplementation can make serum Creatinine less representative of filtration.
The calculation is also less reliable when kidney function is changing rapidly.
Cystatin C can provide an alternative filtration marker where Creatinine-based estimation is uncertain.
Urine Albumin/Creatinine Ratio is also important because kidney disease can be present with significant albumin leakage even when eGFR remains relatively preserved.
What Does the Estimated Glomerular Filtration Rate Test Check?
This test measures 1 calculated biomarker.
Estimated Glomerular Filtration Rate (eGFR)
Provides a calculated estimate of kidney filtration based principally on serum Creatinine and validated demographic variables, supporting assessment and monitoring of renal function.
Who May Benefit From the Estimated Glomerular Filtration Rate Test?
eGFR is useful for routine kidney screening and monitoring in people with known renal risk factors.
People with diabetes - Diabetes is a major cause of chronic kidney disease.
People with high blood pressure - Hypertension can both cause and result from kidney disease.
People with known chronic kidney disease - Serial eGFR measurements help monitor progression.
People with a previously raised Creatinine result - eGFR provides a more interpretable estimate of filtration.
People taking medicines that require renal monitoring - Kidney function affects the safety and dosing of many medicines.
Older adults undergoing kidney assessment - Kidney filtration can decline with age.
People with cardiovascular disease - Kidney and cardiovascular disease frequently coexist.
People with a family history of kidney disease - Earlier monitoring may be appropriate.
People with protein or blood detected in urine - eGFR can complement urine investigations.
People undergoing routine preventive health screening - Early kidney disease can be clinically silent.
How to Prepare
Do not deliberately overhydrate before testing to try to increase eGFR.
Kidney health is best assessed using trends and complementary urine markers rather than attempting to influence one measurement.
Symptoms and Reasons to Consider the Estimated Glomerular Filtration Rate Test
Early chronic kidney disease usually produces no symptoms, making laboratory assessment particularly important.
Reduced urine output - A substantial acute change can occur with significant kidney dysfunction.
Swelling around the ankles or legs - Fluid retention can occur in some kidney conditions.
Foamy urine - Persistent foam may reflect significant urinary protein and can warrant kidney assessment.
Blood detected in the urine - Haematuria requires appropriate investigation.
Persistent fatigue with known kidney risk factors - Advanced kidney dysfunction can contribute to tiredness.
High blood pressure - Kidney disease can contribute to difficult-to-control hypertension.
A previous reduced eGFR result - Repeat testing can determine whether the reduction persists.
Diabetes without symptoms - Kidney monitoring remains important because diabetic kidney disease can initially be silent.
These symptoms are not specific to kidney disease.
Markedly reduced urine output, severe swelling, confusion, breathlessness or acute illness with rapidly deteriorating kidney function requires prompt medical assessment.
How to Book Your Estimated Glomerular Filtration Rate Test
Booking your eGFR assessment with London Blood Tests is straightforward.
Choose the Estimated Glomerular Filtration Rate
Select the individual eGFR kidney-filtration test.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy.
Attend your appointment
A trained healthcare professional collects the blood specimen required for the Creatinine measurement used in the calculation.
Laboratory analysis
Serum Creatinine is measured and the validated eGFR calculation is performed.
Receive your results securely
Your authorised kidney-filtration result is delivered securely.
When Will I Receive My Results?
The current expected turnaround is approximately 1–2 business days after your sample reaches the laboratory.
The underlying Creatinine measurement is routine biochemistry, and the eGFR is then calculated using the laboratory's validated equation.
Your report is issued once the measurement, calculation and laboratory authorisation are complete.
Occasional sample issues or repeat analysis can extend reporting beyond the usual timeframe.
Understanding Your Results
An eGFR of 90 mL/min/1.73 m² or above is generally considered preserved filtration, although kidney disease can still exist if other markers such as urine Albumin are abnormal.
An eGFR between 60 and 89 may represent mildly reduced filtration and can occur with normal ageing.
Values below 60 are more clinically significant when persistent.
Chronic kidney disease is not normally diagnosed solely because one eGFR is below 60.
Persistence for three months or another marker of kidney damage is generally required.
Lower values correspond to progressively greater reduction in filtration.
Very low eGFR can indicate severe kidney impairment and requires appropriate clinical assessment.
The rate of change over time is also important.
A sudden fall can indicate acute kidney injury even if the absolute value remains above a chronic disease threshold.
Why Book With London Blood Tests?
Private eGFR testing in London - Access targeted kidney-filtration assessment privately.
Widely used kidney marker - eGFR is central to routine renal assessment.
Useful for monitoring trends - Serial measurements can show whether filtration is stable or changing.
Relevant to medication safety - Many medicines require adjustment according to renal function.
Useful in diabetes and hypertension monitoring - Both conditions increase kidney risk.
Fast results - Current turnaround is approximately 1–2 business days.
Clinic and home collection options - Professional phlebotomy can be arranged.
Clear pricing - The Estimated Glomerular Filtration Rate test costs £38.
Private Estimated Glomerular Filtration Rate Blood Test in London
London Blood Tests provides private eGFR testing in London for people requiring targeted assessment of kidney filtration.
The test costs £38 and provides one calculated biomarker: Estimated Glomerular Filtration Rate.
Results are expected approximately 1–2 business days after laboratory receipt.
A single reduced eGFR should be interpreted alongside Creatinine, previous results and urine markers before chronic kidney disease is concluded.