NK Cytotoxicity Assay Blood Test Marylebone
From 1 October 2026 — until then book at South Kensington or St Paul's. South Kensington · St Paul's
£1169
+ £50 phlebotomy fee (per visit)
+ £50 phlebotomy (per visit)
Confidential Results
Secure online portal
Fast Results
3 working days- before 10AM
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
Within the female hormones and fertility range at Wimpole Street, the NK Cytotoxicity Assay is the test to consider when the question concerns natural Killer Cells, immune System Test and cell Toxicity. It costs £1,169, and once the Marylebone clinic opens on 1 October 2026 a nurse or phlebotomist takes the venous blood sample (heparin), with the laboratory typically reporting in 3 working days- before 10AM, Monday to Thursday only. 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.
NK Cytotoxicity Assay’s place in female hormones and fertility testing
- Sample
- venous blood sample (heparin)
- Laboratory turnaround
- 3 working days- before 10AM, Monday to Thursday only
- Appointment
- 20 minutes
- Standard price
- £1,169 + £50 phlebotomy per visit
What NK Cytotoxicity Assay measures
The catalogue tags the NK Cytotoxicity Assay with natural Killer Cells, immune System Test and cell Toxicity. Those terms describe the territory the test covers; the notes below explain what a female hormones and fertility result can and cannot tell you.
Female hormone tests measure the pituitary hormones FSH and LH, the ovarian hormones oestradiol and progesterone, prolactin, and androgens such as testosterone and DHEA-sulphate that matter in conditions like polycystic ovary syndrome. Anti-Müllerian hormone (AMH) estimates the remaining pool of egg follicles, while inhibin B and specialist reproductive immunology tests such as natural killer cell assays are used in fertility clinics for particular questions. Profiles for PCOS, hirsutism, amenorrhoea and recurrent miscarriage combine the relevant markers.
Preparing for your NK Cytotoxicity Assay
- 1Timing matters: FSH, LH and oestradiol are usually sampled on day 2 to 5 of the cycle, and progesterone around day 21 (or seven days before the expected period).
- 2AMH, testosterone and prolactin can be measured at any point in the cycle; prolactin should be taken rested and not immediately after a meal, exercise or breast stimulation.
- 3Hormonal contraception alters many of these values — tell the nurse what you are using, and discuss whether to pause it before testing.
- 4Note the first day of your last period on the day of the sample so the laboratory ranges can be applied correctly.
Sample for this test: venous blood sample (heparin).
Who considers NK Cytotoxicity Assay
- People often consider these tests if their periods have become irregular, very heavy or have stopped altogether.
- Difficulty conceiving after several months of trying is a common reason to check FSH, LH, AMH and progesterone.
- Excess facial or body hair, acne into adulthood or scalp thinning may prompt an androgen profile.
- Those weighing up egg freezing or IVF often want an AMH value beforehand.
- Unexplained milk production or a loss of libido can lead to prolactin being measured.
Understanding your NK Cytotoxicity Assay results
A high FSH early in the cycle can indicate diminished ovarian reserve, and AMH adds a cycle-independent view of the same question; a mid-luteal progesterone above the laboratory threshold suggests ovulation occurred. Raised LH relative to FSH with elevated androgens may support, but does not by itself establish, a diagnosis of PCOS. High prolactin is commonly due to stress, medication or the timing of the sample and is often repeated before imaging is considered.
Every female hormone value depends on cycle day, contraception and age, so the report is interpreted against your history rather than a fixed range.
Related areas of testing at Wimpole Street: menopause and perimenopause, pregnancy-related tests, pituitary and growth hormones, male hormones.
Pricing
NK Cytotoxicity Assay
Individual test
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£1219Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
From booking the NK Cytotoxicity Assay to reading your result
- 1
Choose your test
Select the NK Cytotoxicity Assay 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 (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 3 working days- before 10AM, Monday to Thursday only 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 NK Cytotoxicity Assay
- TH1/TH2 Intracellular Cytokine Ratios with IVIG, PrednisoloneWimpole Street, Marylebone · from 1 October 2026
- TH1/TH2 Intracellular Cytokine Ratios with PrednisoloneWimpole Street, Marylebone · from 1 October 2026
- Amenorrhoea Profile (Venous)Wimpole Street, Marylebone · from 1 October 2026
- Antimullerian Hormone (AMH) (Venous)Wimpole Street, Marylebone · from 1 October 2026
Frequently Asked Questions
A venous blood sample (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 3 working days- before 10AM, Monday to Thursday only 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 NK Cytotoxicity Assay 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.
