1,25-dihydroxyvitamin D (calcitriol)
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Inhibin B
148.00
The Inhibin B test measures a hormone involved in reproductive function. It is widely used in fertility and gonadal health assessment.
Turnaround time
6 days
Biomarkers count
1
Same-Day Appointments
UKAS Accredited Labs
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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.
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Details about Inhibin B
What is the Inhibin B test?
The Inhibin B blood test measures the level of Inhibin B, a hormone produced by the ovaries in women and the testes in men. It plays a key role in regulating follicle-stimulating hormone (FSH) and reflects gonadal activity.
In women, Inhibin B is secreted by ovarian follicles and provides information about ovarian reserve and follicular function. In men, it is produced by Sertoli cells in the testes and reflects spermatogenic activity.
Because Inhibin B directly reflects gonadal function rather than pituitary signalling alone, it offers valuable insight into reproductive health beyond standard hormone tests.
Why do I need an Inhibin B test?
Inhibin B is commonly used in fertility investigations and endocrine assessment of reproductive organs.
You may need an Inhibin B test if you:
- Are undergoing fertility assessment
- Are planning assisted reproductive treatment (IVF/ICSI)
- Have suspected reduced ovarian reserve
- Have irregular or absent menstrual cycles
- Have suspected testicular dysfunction
- Have low sperm count or infertility
- Are being assessed for gonadal failure
Clinical uses include:
- Female fertility and ovarian reserve assessment
- Male fertility and spermatogenesis evaluation
- Differentiating primary vs secondary gonadal disorders
- Monitoring certain gonadal tumours
Benefits of the Inhibin B test
- Key fertility biomarker
Reflects ovarian and testicular function. - Assesses ovarian reserve
Useful alongside AMH and FSH in women. - Evaluates spermatogenesis in men
Indicates Sertoli cell activity. - Supports infertility investigations
Provides direct gonadal insight. - Clinically established hormone test
Used in reproductive endocrinology. - Useful in tumour monitoring
Relevant for certain ovarian and testicular tumours. - Complements other hormone tests
Adds value to FSH, LH and AMH testing. - Simple blood test
Requires only one sample.
Step by step – how the test works
You can access Inhibin B testing UK-wide through two options:
- Clinic appointment
Choose your nearest UK clinic where a healthcare professional will take your blood sample. - At-home or hotel visit (£60 extra)
A qualified phlebotomist comes to your home or hotel, so you don’t need to travel.
Your sample is analysed in an accredited UK laboratory and results are delivered securely.
Your results explained
Low Inhibin B levels
May indicate reduced ovarian reserve in women or impaired spermatogenesis in men.
Typical UK interpretation:
- Below age- and sex-adjusted reference range
Normal Inhibin B levels
Suggest normal gonadal function and hormone regulation.
Typical UK interpretation:
- Within age- and sex-adjusted reference range
High Inhibin B levels
May be seen in certain ovarian or testicular tumours or increased gonadal activity.
Typical UK interpretation:
- Above reference range
Reference ranges vary by age, sex and clinical context.
How It Works
Simple steps to get your results
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Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
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Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
3
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
Frequently Asked Questions
No. Both assess ovarian function but reflect different biological processes.
Yes. It reflects testicular Sertoli cell function.
No fasting is required.
Often early in the menstrual cycle, depending on clinical advice.
It contributes useful information but is not predictive alone.
Yes. Levels decline with age in women.
Yes, particularly in fertility treatment or tumour follow-up.
Yes, in specialist endocrine assessment.
Yes. Home or hotel phlebotomy is available UK-wide for £60 extra.
Yes. Fertility or endocrine specialists should interpret results.
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