Magnesium (Whole blood) Blood Test Marylebone
From 1 October 2026 — until then book at South Kensington or St Paul's. South Kensington · St Paul's
£111
+ £50 phlebotomy fee (per visit)
+ £50 phlebotomy (per visit)
Confidential Results
Secure online portal
Fast Results
4 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
Magnesium (Whole blood) is a bone, calcium and parathyroid test concerned with mineral level, blood test and essential nutrients, run on a venous blood sample (EDTA and heparin). At Wimpole Street it is priced at £111 for everyone and, from 1 October 2026, a nurse or phlebotomist takes the sample at 22 Wimpole Street, Marylebone. The laboratory quotes 4 days; the report, with reference ranges, is delivered to your secure portal for you to discuss with your GP or a clinician.
Magnesium (Whole blood)’s place in bone, calcium and parathyroid testing
- Sample
- venous blood sample (EDTA and heparin)
- Laboratory turnaround
- 4 days
- Appointment
- 20 minutes
- Standard price
- £111 + £50 phlebotomy per visit
Who considers Magnesium (Whole blood)
- People often consider these tests if they have broken a bone from a minor fall or have lost height.
- A family history of osteoporosis, early menopause or long-term steroid use are frequent reasons to check.
- Kidney stones, unexplained tiredness, thirst or constipation may prompt calcium and parathyroid hormone to be measured.
- Those on osteoporosis treatment sometimes track turnover markers to see whether the medicine is working.
- Muscle cramps and tingling around the mouth occasionally lead to a low-calcium investigation.
What Magnesium (Whole blood) measures
The catalogue tags the Magnesium (Whole blood) with mineral level, blood test and essential nutrients. Those terms describe the territory the test covers; the notes below explain what a bone, calcium and parathyroid result can and cannot tell you.
Bone and calcium tests measure calcium (total, adjusted for albumin, or ionised), phosphate, magnesium, alkaline phosphatase and parathyroid hormone, which regulates calcium moment to moment. Bone turnover markers such as CTX (crosslaps), P1NP, osteocalcin and urinary DPD reflect how quickly bone is being broken down and rebuilt. Bone and osteoporosis screens combine these with vitamin D and, where relevant, sex hormones and thyroid function.
Preparing for your Magnesium (Whole blood)
- 1Bone turnover markers such as CTX vary through the day and after eating; a fasting morning sample gives comparable results.
- 2Stop calcium supplements for 24 hours before a calcium or parathyroid hormone test unless advised otherwise.
- 3Tell the nurse if you have had a fracture, surgery or a period of immobility recently, which raise turnover markers.
Sample for this test: venous blood sample (EDTA and heparin).
Understanding your Magnesium (Whole blood) results
A raised calcium with a parathyroid hormone that is high or not suppressed can indicate primary hyperparathyroidism, whereas high calcium with low PTH points to other causes that need investigation. Low calcium is read together with vitamin D, magnesium and PTH to find the mechanism. Bone turnover markers show the rate of remodelling, not bone density itself; a DEXA scan remains the way to measure that.
Blood tests describe the chemistry of bone metabolism and do not measure bone density; interpretation depends on imaging, history and fracture risk tools.
Related areas of testing at Wimpole Street: vitamin D, kidney function and electrolytes, menopause and perimenopause, thyroid function.
Pricing
Magnesium (Whole blood)
Individual test
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£161Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
From booking the Magnesium (Whole blood) to reading your result
- 1
Choose your test
Select the Magnesium (Whole blood) 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 (EDTA and heparin) 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 4 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.
- Samples are taken by a nurse or phlebotomist at 22 Wimpole Street, Marylebone, in a clinic built for medical and dental care.
- Analysis is carried out by a UKAS-accredited partner laboratory, so methods and reference ranges match those used across the NHS.
Other tests often considered alongside Magnesium (Whole blood)
Frequently Asked Questions
A venous blood sample (EDTA and heparin). 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 4 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 Magnesium (Whole 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 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.
