Xanthine – Blood Blood Test Marylebone
From 1 November 2026 — until then book at South Kensington or St Paul's. South Kensington · St Paul's
£125
+ £50 phlebotomy fee (per visit)
+ £50 phlebotomy (per visit)
Confidential Results
Secure online portal
Fast Results
2 weeks
Professional Service
Experienced phlebotomists
Wimpole Street, Marylebone (opening 1 November 2026)
Opening hours from 1 November 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
Within the laboratory tests range at Wimpole Street, the Xanthine – Blood answers a narrower question than the broader profiles. It costs £125, and once the Marylebone clinic opens on 1 November 2026 a nurse or phlebotomist takes the venous blood sample (EDTA), with the laboratory typically reporting in 2 weeks. Medical services are for patients aged 16 and over, self-referral with no GP referral needed, and the laboratory report is delivered to your secure portal.
Xanthine – Blood’s place in laboratory tests testing
- Sample
- venous blood sample (EDTA)
- Laboratory turnaround
- 2 weeks
- Appointment
- 20 minutes
- Standard price
- £125 + £50 phlebotomy per visit
What Xanthine – Blood measures
This test measures a specific substance, enzyme, protein or cellular feature in the sample provided, and is usually requested to answer a particular question raised by symptoms, another result or a specialist’s assessment. Some tests in this group are highly specialised assays run by reference laboratories, others are components more often seen inside a larger profile. The product description above gives the specific parameter, sample type and turnaround.
Who considers Xanthine – Blood
- People often consider this test if their GP or a specialist has suggested it to clarify a previous finding.
- It may be part of monitoring an existing condition between clinic reviews.
- Some people request it to complete a set of investigations recommended elsewhere.
- Occasionally it is added to a broader profile to answer a specific additional question.
Preparing for your Xanthine – Blood
- 1Most tests need no special preparation; where fasting, timing or medication adjustments matter, the product description or the nurse will say so.
- 2Bring a list of your medicines and supplements, since several assays are influenced by them.
- 3If you are unsure whether this is the right test for your question, contact the clinic before booking and the nurse can advise or suggest an alternative.
Sample for this test: venous blood sample (EDTA).
Understanding your Xanthine – Blood results
Your result is reported against the laboratory’s reference range for your age and sex, and any value outside that range is flagged on the report. Specialist assays sometimes have narrow clinical uses, so the result is best read in the context of why it was requested. We do not provide clinical interpretation; a result is not a diagnosis, and its meaning depends on your history and symptoms, so discuss it with your GP or a clinician.
Laboratory values are one part of a clinical picture, and any unexpected result should be discussed with the clinician who is looking after the wider question.
Related areas of testing at Wimpole Street: wellness and biochemistry profiles, full blood count, kidney function and electrolytes, liver function.
Pricing
Xanthine – Blood
Individual test
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£175Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
From booking the Xanthine – Blood to reading your result
- 1
Choose your test
Select the Xanthine – Blood and any others you want run from the same visit. Until 1 November 2026 the identical test can be booked at South Kensington or St Paul’s.
- 2
Nurse-led sample
From 1 November 2026 the venous blood sample (EDTA) 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 2 weeks 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 November 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 November 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.
- One standard price applies to everyone — there is no members’ tier at Wimpole Street.
- Bond Street is about six minutes on foot and Oxford Circus about seven, so the clinic suits people working across the West End.
Other tests often considered alongside Xanthine – Blood
Frequently Asked Questions
A venous blood sample (EDTA). A nurse or phlebotomist collects it at 22 Wimpole Street, Marylebone from 1 November 2026; the appointment allows time for identity checks and any preparation questions. The laboratory quotes 2 weeks for this test.
Ready to Book Your Test?
Wimpole Street opens 1 November 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 Xanthine – Blood 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 November 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.