Vitamin K (Nutritional) Blood Test Marylebone
From 1 October 2026 — until then book at South Kensington or St Paul's. South Kensington · St Paul's
£104
+ £50 phlebotomy fee (per visit)
+ £50 phlebotomy (per visit)
Confidential Results
Secure online portal
Fast Results
5 days"
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
People looking into nutrient deficiency and coagulation in Marylebone are usually looking for the Vitamin K (Nutritional). It belongs to our nutrition, vitamins and trace elements group and needs a venous blood sample (serum), which a nurse or phlebotomist collects at 22 Wimpole Street, Marylebone once the clinic opens on 1 October 2026. The laboratory typically returns a result in 5 days, and the standard price is £104 with no members’ tier.
Vitamin K (Nutritional)’s place in nutrition, vitamins and trace elements testing
- Sample
- venous blood sample (serum)
- Laboratory turnaround
- 5 days
- Appointment
- 20 minutes
- Standard price
- £104 + £50 phlebotomy per visit
What Vitamin K (Nutritional) measures
Vitamin K (Nutritional) is most often requested in connection with nutrient deficiency, coagulation and blood clotting, which is why it sits within the nutrition, vitamins and trace elements group at Wimpole Street.
Nutritional tests measure the vitamins and minerals your body needs in small amounts: zinc, copper, selenium, magnesium, manganese, iodine and chromium among the elements, and vitamins A, E, K, C and the B group beyond B12 and folate. Fatty acid profiles report the balance of omega-3 and omega-6 in red cell membranes, and coenzyme Q10 or carotenes reflect particular dietary and supplement patterns. Vitamin and mineral profiles bundle the commonly requested items into a single sample.
Who considers Vitamin K (Nutritional)
- People often consider these tests if they follow a restricted diet — vegan, very low carbohydrate, or limited by allergy or intolerance.
- Hair loss, brittle nails, poor wound healing or altered taste can prompt zinc and other trace element checks.
- Those with conditions affecting absorption, such as Crohn’s disease, coeliac disease or a history of bariatric surgery, monitor at intervals.
- Heavy alcohol use is a common reason to check thiamine, magnesium and zinc.
- Athletes and people taking many supplements sometimes check they are neither short nor accumulating too much.
Preparing for your Vitamin K (Nutritional)
- 1Fast overnight for zinc, copper and fatty acid profiles, as recent meals shift the values.
- 2Stop the specific supplement being measured for at least 24 to 48 hours, unless your aim is to check that supplementation is adequate.
- 3Some vitamins, notably A, E and C, are light-sensitive and require special handling; the nurse will manage this but it is worth allowing a little extra time.
- 4Note any zinc or copper-containing dental fixatives or multivitamins, which can influence results.
Sample for this test: venous blood sample (serum).
Understanding your Vitamin K (Nutritional) results
A low level can indicate insufficient intake or absorption, though for several elements — zinc and selenium especially — blood values are an imperfect proxy for tissue stores and are interpreted with symptoms. Copper and zinc are read together because they compete for absorption, and a high copper with low zinc pattern is more informative than either alone. Excessive levels usually reflect supplement use and are worth knowing about, since some vitamins and minerals are harmful in surplus.
Blood concentrations of many micronutrients are tightly regulated and may not reflect whole-body status, so results are interpreted alongside diet, symptoms and other markers.
Related areas of testing at Wimpole Street: vitamin D, vitamin B12 and folate, iron and ferritin, food intolerance and digestive sensitivity.
Pricing
Vitamin K (Nutritional)
Individual test
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£154Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
From booking the Vitamin K (Nutritional) to reading your result
- 1
Choose your test
Select the Vitamin K (Nutritional) 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 5 days 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)
- Repeat or additional tests can usually be added to the same visit rather than requiring a second appointment.
- Bond Street is about six minutes on foot and Oxford Circus about seven, so the clinic suits people working across the West End.
- Samples are taken by a nurse or phlebotomist at 22 Wimpole Street, Marylebone, in a clinic built for medical and dental care.
Other tests often considered alongside Vitamin K (Nutritional)
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 5 days 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 Vitamin K (Nutritional) 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.
