Urea and Electrolytes (Kidney Function) Blood Test Marylebone
From 1 October 2026 — until then book at South Kensington or St Paul's. South Kensington · St Paul's
£64
+ £50 phlebotomy fee (per visit)
+ £50 phlebotomy (per visit)
Confidential Results
Secure online portal
Fast Results
1 day"
Professional Service
Experienced phlebotomists
Wimpole Street, Marylebone (opening 1 October 2026)
Opening hours from 1 October 2026
- Monday
- 9am – 6pm
- Tuesday
- 9am – 8pm
- Wednesday
- 9am – 6pm
- Thursday
- 9am – 8pm
- Friday
- 8am – 5pm
- Saturday
- 10am – 4pm
- Sunday
- Closed
- Bond Street — about 6 minutes (Central, Jubilee & Elizabeth lines)
- Oxford Circus — about 7 minutes (Central, Bakerloo & Victoria lines)
Wimpole Street, Marylebone
Urea and Electrolytes (Kidney Function) is a kidney function and electrolytes profile concerned with kidney health, blood urea nitrogen and electrolyte balance, run on a venous blood sample (serum). At Wimpole Street it is priced at £64 for everyone and, from 1 October 2026, a nurse or phlebotomist takes the sample at 22 Wimpole Street, Marylebone. The laboratory quotes 1 day; the report, with reference ranges, is delivered to your secure portal for you to discuss with your GP or a clinician.
Urea and Electrolytes (Kidney Function)’s place in kidney function and electrolytes testing
- Sample
- venous blood sample (serum)
- Laboratory turnaround
- 1 day
- Appointment
- 20 minutes
- Standard price
- £64 + £50 phlebotomy per visit
What Urea and Electrolytes (Kidney Function) measures
Laboratories file the Urea and Electrolytes (Kidney Function) under kidney health, blood urea nitrogen and electrolyte balance. The following sections set out how a kidney function and electrolytes profile of this kind is measured and read.
Kidney tests measure waste products the kidneys clear — creatinine and urea — and use creatinine, age and sex to estimate filtration rate (eGFR). Electrolytes such as sodium, potassium, chloride and bicarbonate show how well fluid and acid–base balance is being maintained, and cystatin C offers an alternative filtration marker less affected by muscle mass. Urine albumin-to-creatinine ratio, when added, looks for early protein leak.
Who considers Urea and Electrolytes (Kidney Function)
- People often consider kidney tests if they have high blood pressure or diabetes, both of which place the kidneys under long-term strain.
- Regular use of anti-inflammatory painkillers, lithium or certain blood pressure tablets is a common reason to monitor.
- Swollen ankles, foamy urine or passing water more often at night may prompt a check.
- Those with a family history of polycystic kidney disease or kidney failure frequently want a baseline.
- It is included in most general health screens and before starting some medicines and supplements.
Preparing for your Urea and Electrolytes (Kidney Function)
- 1No fasting is needed; drink water as normal, since a low fluid intake can push creatinine up.
- 2Avoid a large protein meal or a heavy gym session the day before, since both raise creatinine temporarily.
- 3Creatine supplements can also inflate creatinine; mention them to whoever interprets your report so they can account for it.
Sample for this test: venous blood sample (serum).
Understanding your Urea and Electrolytes (Kidney Function) results
A high creatinine or low eGFR can indicate reduced filtration, though a single value in a muscular person or after dehydration may overstate the problem. Potassium and sodium outside their ranges are taken seriously because they affect heart rhythm and fluid balance, and the laboratory may telephone the clinic if a value is markedly abnormal. Trends over time matter more than a single snapshot, so previous results are useful.
eGFR is an estimate derived from creatinine and is less reliable at extremes of body size or in pregnancy; interpretation depends on your history and any medicines.
Related areas of testing at Wimpole Street: liver function, urine tests, diabetes, glucose and HbA1c, bone, calcium and parathyroid.
Pricing
Urea and Electrolytes (Kidney Function)
Test profile
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£114Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
From booking the Urea and Electrolytes (Kidney Function) to reading your result
- 1
Choose your test
Select the Urea and Electrolytes (Kidney Function) and any others you want run from the same visit. Until 1 October 2026 the identical test can be booked at South Kensington or St Paul’s.
- 2
Nurse-led sample
From 1 October 2026 the venous blood sample (serum) is taken at 22 Wimpole Street, Marylebone by our nursing team, led by Precious Agbonmamwen, Registered Adult Nurse (NMC 20H1641E). Identity is checked and any preparation questions answered first.
- 3
UKAS-accredited laboratory
The sample travels to a UKAS-accredited partner laboratory, whose methods and reference ranges match those used across the NHS and private sectors.
- 4
Laboratory report to your secure portal
The laboratory report is released to your secure portal — typically from 24 hours; the laboratory quotes 1 day for this test. It shows each value against the reference range and flags anything outside it; discuss the report with your GP or a clinician.
Why test at Wimpole Street
Wimpole Street Medical & Dental opens at 22 Wimpole Street on 1 October 2026. Medical services are for patients aged 16 and over; registration with the CQC is in progress ahead of opening.
Wimpole Street, Marylebone (opening 1 October 2026)
- Bond Street — about 6 minutes (Central, Jubilee & Elizabeth lines)
- Oxford Circus — about 7 minutes (Central, Bakerloo & Victoria lines)
- Self-referral: you choose the test and book directly — no GP referral is needed, and the laboratory report is yours to take to your GP or a clinician.
- Registration with the CQC is in progress ahead of opening; our South Kensington and St Paul’s clinics are CQC registered.
- One standard price applies to everyone — there is no members’ tier at Wimpole Street.
Other tests often considered alongside Urea and Electrolytes (Kidney Function)
Frequently Asked Questions
A venous blood sample (serum). A nurse or phlebotomist collects it at 22 Wimpole Street, Marylebone from 1 October 2026; the appointment allows time for identity checks and any preparation questions. The laboratory quotes 1 day for this test.
Ready to Book Your Test?
Wimpole Street opens 1 October 2026. Register your interest for the Marylebone diary, or book the same test now at South Kensington or St Paul's.
Important information about the Urea and Electrolytes (Kidney Function) at Wimpole Street
- Medical services at Wimpole Street Medical & Dental are for patients aged 16 and over.
- This is a self-referral service: you choose the test and book directly — no GP referral is needed.
- Nurse-led by Precious Agbonmamwen, Registered Adult Nurse (NMC 20H1641E), who oversees sample-taking standards, infection control and the patient pathway. The nursing team does not interpret results.
- A laboratory result is not a diagnosis and this page is not a substitute for medical advice. We do not provide clinical interpretation of results — please discuss your report with your GP or a clinician, particularly if a value is flagged or you have symptoms.
- CQC registration for Wimpole Street is in progress ahead of the opening on 1 October 2026; our South Kensington and St Paul’s clinics are CQC registered.
- Your results are held on a secure portal and treated as strictly confidential, except where disclosure is required by law.
- If you are seriously unwell, call 999. For urgent advice that is not an emergency, call NHS 111.
