Doctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
Inhibin B
Inhibin B provides insight into gonadal health, which can influence hormonal balance, recovery capacity, and overall athletic performance. For active individuals, reproductive hormone balance is often a factor in training outcomes.
Reference Ranges
Low
25
Normal
325
High
Low
0
Normal
341
High
Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.
What It Measures
This test measures the concentration of Inhibin B in your blood. In women, it is produced by developing ovarian follicles and reflects follicular activity. In men, it is produced by Sertoli cells in the testes and is associated with sperm production.
Why It Matters
For performance-focused individuals, Inhibin B may help assess whether training load or body composition changes are affecting reproductive hormone balance. Maintaining hormonal equilibrium is important for sustained performance.
When to Test
Testing may be recommended when evaluating fertility concerns, assessing ovarian reserve, investigating unexplained infertility, or monitoring testicular function. Your healthcare provider can advise on optimal testing timing.
Symptoms
Low Levels
Some people with low Inhibin B may experience fertility challenges. In women, this could suggest reduced ovarian reserve. In men, low levels may be associated with decreased sperm production or testicular dysfunction.
High Levels
Elevated Inhibin B levels are not typically associated with specific symptoms in healthy individuals. However, markedly high levels may sometimes be associated with certain gonadal tumours and should be evaluated by a healthcare provider.
Lifestyle Tips
Maintaining a healthy weight, managing stress, and avoiding smoking may support reproductive health and gonadal function. Regular check-ups with a healthcare provider can help monitor fertility markers over time.
Frequently Asked Questions
What does Inhibin B tell us about fertility?
In women, Inhibin B reflects ovarian follicle activity and may indicate ovarian reserve. In men, it is associated with Sertoli cell function and sperm production capacity.
When during the menstrual cycle should Inhibin B be tested?
For women, Inhibin B is typically tested in the early follicular phase of the menstrual cycle. Your healthcare provider will advise on the best timing.
Can Inhibin B levels change over time?
Yes, Inhibin B levels typically decline with age in both men and women. In women, this decline may accelerate as ovarian reserve diminishes approaching menopause.