Inhibin B
Private Inhibin B blood test in London for £148, assessing one reproductive hormone with specialist results expected in around 6 days.
Turnaround time
6 business days
Biomarkers count
1
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Overview of the Inhibin B Test
The Inhibin B blood test measures Inhibin B, a reproductive hormone produced by ovarian granulosa cells in women and Sertoli cells within the testes in men.
The test contains 1 biomarker: Inhibin B.
Inhibin B contributes to regulation of the reproductive hormonal axis by providing negative feedback to the pituitary gland, particularly on Follicle Stimulating Hormone.
In women, Inhibin B is produced by developing ovarian follicles.
Its concentration therefore varies with ovarian follicular activity, menstrual-cycle stage and age.
It has historically been used as one marker of ovarian reserve and ovarian response, although Anti-Müllerian Hormone is now more commonly used for many fertility assessments because AMH varies less throughout the menstrual cycle.
Inhibin B can still provide complementary information in selected fertility or reproductive-endocrine investigations.
In men, Inhibin B is produced predominantly by Sertoli cells and is associated with seminiferous-tubule function and spermatogenic activity.
Lower concentrations may be seen where sperm production or Sertoli-cell function is impaired.
The test can therefore contribute to male infertility assessment alongside FSH, Testosterone and semen analysis.
Inhibin B is also used in specialist settings during assessment or monitoring of certain gonadal tumours, particularly selected granulosa-cell tumours.
It is not a general cancer-screening test and should not be interpreted as one.
Reference intervals vary considerably with sex, age, menstrual stage and the reason for testing, making clinical context particularly important.
What Does the Inhibin B Test Check?
The test measures one gonadal hormone associated with ovarian follicular activity in women and Sertoli-cell and spermatogenic function in men. This test measures 1 biomarker.
Inhibin B
Measures circulating Inhibin B, a hormone involved in reproductive function and feedback regulation of Follicle Stimulating Hormone.
Who May Benefit From the Inhibin B Test?
Inhibin B may be useful within selected fertility, reproductive-endocrine or specialist gonadal assessments where additional information beyond routine pituitary hormones is required.
Women undergoing fertility assessment - Inhibin B can provide supplementary information about follicular activity and ovarian function.
Women undergoing assisted reproductive treatment - The marker may occasionally be used alongside AMH, FSH and ultrasound findings.
Women with concerns about reduced ovarian reserve - Inhibin B can contribute to a broader assessment but should not be interpreted alone.
Men undergoing infertility investigation - Inhibin B can provide information related to Sertoli-cell function and spermatogenesis.
Men with a low sperm count - The result may complement FSH, Testosterone and formal semen analysis.
People undergoing investigation of gonadal dysfunction - Inhibin B can contribute information about ovarian or testicular activity.
People being monitored for selected gonadal tumours - Testing may be requested by an oncology or endocrine specialist in specific circumstances.
People with a previous abnormal Inhibin B result - Repeat measurement may be used where clinically indicated.
How to Prepare
Do not alter fertility medication or hormonal treatment simply to influence the laboratory result.
When the test is being used within an IVF or fertility-treatment pathway, follow the timing instructions provided by the fertility team.
Symptoms and Reasons to Consider the Inhibin B Test
There are no symptoms specific to an abnormal Inhibin B concentration. Testing is usually driven by fertility concerns, gonadal function or specialist monitoring.
Difficulty conceiving - Inhibin B can provide additional reproductive information within a broader fertility assessment.
A low sperm count - Lower Inhibin B may accompany impaired spermatogenesis in some men.
Azoospermia or severe male-factor infertility - Inhibin B can complement FSH and semen-analysis findings.
Irregular menstrual cycles with fertility concerns - A wider ovarian and pituitary hormone assessment may be appropriate.
Concern about ovarian reserve - Inhibin B may add information alongside AMH and FSH.
Unexpected reproductive-hormone abnormalities - The marker can contribute to specialist endocrine assessment.
Monitoring following a previous gonadal tumour diagnosis - Inhibin B may be used in selected tumour types under specialist supervision.
Inhibin B does not determine whether a person can or cannot conceive.
Fertility depends on many additional factors, and the result should be interpreted alongside age, reproductive history, semen analysis, ovarian imaging and other hormone measurements.
How to Book Your Inhibin B Test
The Inhibin B test can be booked privately for specialist fertility, reproductive-endocrine or gonadal assessment.
Choose the Inhibin B
Select the individual Inhibin B blood test online.
Select your sample collection option
Choose an in-clinic appointment or professional home or hotel phlebotomy according to availability.
Attend your appointment
A trained healthcare professional collects the required venous blood specimen and relevant cycle or fertility information should be documented.
Laboratory analysis
Your serum undergoes specialist measurement of Inhibin B.
Receive your results securely
Your authorised result is delivered securely and can be interpreted with a fertility specialist, endocrinologist or other appropriate clinician.
When Will I Receive My Results?
The current expected turnaround for Inhibin B is approximately 6 days after your sample reaches the laboratory.
Inhibin B is a specialist reproductive-hormone assay rather than a routine same-day endocrine marker.
The specimen undergoes dedicated analysis, laboratory quality control and authorisation.
Turnaround begins once the sample reaches the laboratory rather than necessarily from the day of collection.
Specialist processing, repeat analysis or laboratory review can occasionally extend the estimated reporting period.
Understanding Your Results
Inhibin B reference intervals depend heavily on age, sex and clinical context.
In women, concentrations vary during the menstrual cycle and generally decline as ovarian follicular activity and ovarian reserve decrease with age.
A lower result may therefore be seen with reduced follicular activity, but it should not be interpreted as a standalone measure of fertility potential.
AMH, FSH, age and ultrasound assessment of antral follicles often provide important complementary information.
In men, lower Inhibin B can be associated with impaired Sertoli-cell function or reduced spermatogenesis.
The relationship is not absolute, so semen analysis remains essential where fertility is the main clinical question.
Higher concentrations require interpretation according to the reason for testing. In specialist oncology settings, Inhibin B may be used during monitoring of selected gonadal tumours.
The laboratory result should therefore always be interpreted against the age-, sex- and assay-specific reference range provided on the report.
Why Book With London Blood Tests?
London Blood Tests provides private access to this specialist reproductive hormone with flexible professional sample collection.
Specialist fertility marker - Measures a hormone produced directly by ovarian follicles and testicular Sertoli cells.
Useful in male fertility assessment - Can provide additional information about spermatogenic function.
Relevant to ovarian-function assessment - May complement AMH, FSH and ultrasound findings.
Useful within specialist reproductive endocrinology - Provides information beyond pituitary hormone measurements alone.
Professional venous sample collection - Appropriate blood collection can be arranged privately.
Specialist laboratory analysis - Samples undergo dedicated Inhibin B measurement.
Secure reporting - Receive your authorised result confidentially.
Clear pricing - The Inhibin B test costs £148.
Private Inhibin B Blood Test in London
London Blood Tests provides private Inhibin B testing in London for people requiring specialist fertility or reproductive-hormone assessment.
The test costs £148 and measures 1 biomarker: Inhibin B.
Results are expected approximately 6 days after laboratory receipt.
The result is most useful when interpreted alongside other fertility investigations rather than used alone to predict fertility or treatment success.