IGF-1 (Somatomedin) Blood Test Marylebone
From 1 October 2026 — until then book at South Kensington or St Paul's. South Kensington · St Paul's
£113
+ £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
IGF-1 (Somatomedin) is a pituitary and growth hormones test concerned with growth hormone, insulin-like growth factor and pituitary gland, run on a venous blood sample (serum). At Wimpole Street it is priced at £113 for everyone and, from 1 October 2026, a nurse or phlebotomist takes the sample at 22 Wimpole Street, Marylebone. The laboratory quotes 1 day , Desc.: Should be sent to lab immidiately in red bag; the report, with reference ranges, is delivered to your secure portal for you to discuss with your GP or a clinician.
IGF-1 (Somatomedin)’s place in pituitary and growth hormones testing
- Sample
- venous blood sample (serum)
- Laboratory turnaround
- 1 day , Desc.: Should be sent to lab immidiately in red bag
- Appointment
- 20 minutes
- Standard price
- £113 + £50 phlebotomy per visit
Who considers IGF-1 (Somatomedin)
- People often consider pituitary testing if they have persistent headaches with visual changes, or have been told of an incidental finding on a brain scan.
- Unexplained milk production, irregular periods or low libido frequently lead to prolactin being measured.
- Adults noticing enlargement of the hands, feet or jaw may want growth hormone and IGF-1 checked.
- Those with low testosterone or oestradiol and low LH and FSH need pituitary hormones to find the level of the problem.
- A history of head injury, radiotherapy or pituitary surgery is a common reason to monitor.
What IGF-1 (Somatomedin) measures
Laboratories file the IGF-1 (Somatomedin) under growth hormone, insulin-like growth factor and pituitary gland. The following sections set out how a pituitary and growth hormones test of this kind is measured and read.
Pituitary tests measure the hormones released from the small gland at the base of the brain: prolactin, growth hormone and its more stable marker IGF-1, ACTH, TSH, and the gonadotrophins LH and FSH. Because growth hormone is released in pulses, IGF-1 and IGF-BP3 give a smoother reflection of its overall output. A pituitary function profile brings the axes together, and macroprolactin testing checks whether a raised prolactin is biologically active.
Preparing for your IGF-1 (Somatomedin)
- 1Growth hormone should be measured fasting, in the morning, and after 20 to 30 minutes of sitting quietly.
- 2Prolactin rises with stress, exercise, sex and nipple stimulation; avoid these for a few hours beforehand and rest before the sample.
- 3Many medicines, particularly antipsychotics and anti-sickness drugs, raise prolactin — list them for the nurse.
Sample for this test: venous blood sample (serum).
Understanding your IGF-1 (Somatomedin) results
A modestly raised prolactin is often due to stress, medication or macroprolactin and is commonly repeated before imaging; a markedly raised value can indicate a prolactin-producing adenoma and usually prompts referral. A high IGF-1 for your age may point to growth hormone excess, while a low value alongside other low pituitary hormones can indicate underactivity. Because single growth hormone readings fluctuate, dynamic testing in a specialist unit is often needed to confirm either direction.
Pituitary hormones are pulsatile and sensitive to stress, so an isolated result is interpreted cautiously and often repeated before conclusions are drawn.
Related areas of testing at Wimpole Street: adrenal and cortisol, thyroid function, male hormones, female hormones and fertility.
Pricing
IGF-1 (Somatomedin)
Individual test
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£163Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
From booking the IGF-1 (Somatomedin) to reading your result
- 1
Choose your test
Select the IGF-1 (Somatomedin) 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 , Desc.: Should be sent to lab immidiately in red bag 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)
- Bond Street is about six minutes on foot and Oxford Circus about seven, so the clinic suits people working across the West End.
- 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.
- 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 IGF-1 (Somatomedin)
- IGF-BP3Wimpole Street, Marylebone · from 1 October 2026
- Prolactin (Venous)Wimpole Street, Marylebone · from 1 October 2026
- Pituitary Function ProfileWimpole Street, Marylebone · from 1 October 2026
- MacroprolactinWimpole Street, Marylebone · from 1 October 2026
- Growth Hormone (Fasting)Wimpole Street, Marylebone · from 1 October 2026
- Prolactin (Macro)Wimpole Street, Marylebone · from 1 October 2026
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 , Desc.: Should be sent to lab immidiately in red bag 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 IGF-1 (Somatomedin) 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.
