Kidney Function Blood Test
Want to measure your kidney function? Our Kidney Function Blood Test is the test you need.
Kidney function is a core part of your overall health. You can arrange a venous blood draw yourself or visit one of our partner clinics to have your blood taken. You'll get a report with your kidney function test results along with any recomendations of actions to take.
- Results and doctor's report in 6 days or less
- Free, next-working day delivery
- Gold-standard kidney function test
£30.00
Personalise your kidney function blood test
You can choose how you'd like to collect your blood sample. You may also want to add to your test panel depending on your age, sex and any symptoms.
Arrange for a venous blood draw yourself
We'll send you a venous blood sample collection kit. You'll need to arrange for a healthcare professional to take the blood for you.
Visit a clinic to have your blood taken
Dr Claire Merrifield
GP, PhD and our Medical Director
What you need to know about our Kidney Function Blood Test
Dr Claire Merrifield
GP, PhD and our Medical Director
If you're looking for the most accurate blood test to measure kidney function, this is it.
What does the Kidney Function Blood Test check for and why?
This blood test measure your level of cystatin C. This allows us to caluclate your estimated glomerular filtration rate (eGFR).
When it comes to measuring kidney function, cystatin C has been shown to be more accurate than the commonly used marker creatinine. This is because cystatin C is not affected by muscle mass or supplemental creatine use which can give false creatinine measurements.
What do my kidney function results mean?
Our kidney function blood test will tell you your estiamted glomerular filtration rate or eGFR. This measure takes into account your age and sex and we interpret the results as follows:
| eGFR (ml/min/1.73m2) | Interpretation |
| Greater than 90 | Normal kidney function |
| 60-89 | Stage 2 kidney disease. Mild impairment in kidney function. |
| 30 - 59 | Stage 3 kidney disease. Moderate impairment in kidney function. May cause symptoms. |
| 15 - 29 | Stage 4 kidney disease. Moderate to severe impairment in kidney function. |
| Less than 15 | Stage 5 kidney disease. Severe impairment in kidney function. Likely to need dianlysis. |
What's tested in your Kidney Function Blood Test?
- Cystatin C
Cystatin C has been shown to be a more accurate measure of kidney function than traditional creatinine. In particular, cystatin C is not affected by muscle mass or supplemental creatine intake, both of which can cause false results with creatinine.
- Estimated glomerular filtration rate (eGFR)
Kidney function is affected by your age and sex. We adjust for this and calculate your estimated glomerular filtration rate (a measure of kidney function).
Currently, we don't offer the kidney function blood test with a fingerprick collection option. This means that it has to be taken by venous draw. You can arrange for a healthcare professional to collect this for you or you can visit one of our partner clinics to have your blood taken. Lastly, we can also arrange for a nurse to visit you at home or at work if you prefer.
We do not recommend using this test if you:
- are a child (17 years or under)
- are pregnant
- are feeling acutely unwell - e.g. with a cold or flu or if you have new-onset (i.e. within the last few days) sympto
If you're unsure if you should use this test panel, please contact us for advice.
There are no specific preparations you need to take before taking the kidney function blood test. You can eat and drink as normal before the test.
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Selph Ltd, Reg. No. 12169438
124 City Road, London, EC1V 2NX
