Home / Calculators / Fertility assessment / Day-3 FSH interpreter
Every calculator in one place, free and with no sign-up. Results show instantly — we don't hide them behind a form. Each one explains what the number means, where the reference ranges come from, and what it cannot tell you.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
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These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Baseline FSH and what a raised level does and does not indicate.
Compared to published rangesYour values checked against published reference limits. The source is named below; laboratory methods vary.
Day-3 FSH measures how hard the pituitary is working to recruit follicles. Under 10 IU/L is normal and above 15 suggests reduced reserve — but it must be read alongside estradiol, because a high estradiol suppresses FSH and can mask a raised value.
Source — FSH must be measured on day 2–3 with a simultaneous estradiol. It is now generally regarded as less informative than AMH and AFC.
The bands on this page are drawn from published sources but have not yet been reviewed by our medical team, and some vary by laboratory or assay. Check against the reference range printed on your own report.
Day 2–3 of your cycle
Same sample
That falls in the <10 band.
Your result of 6.5 IU/L sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Within the normal baseline range. FSH is a crude marker and a normal value does not exclude reduced reserve.
FSH must be measured on day 2–3 with a simultaneous estradiol. It is now generally regarded as less informative than AMH and AFC.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
Because a raised estradiol suppresses FSH. A "normal" FSH alongside a high estradiol can conceal a raised underlying value, which is why the two are always read together.
FSH fluctuates more than AMH, which is one reason AMH has largely replaced it. Most units treat the highest recorded value as the most meaningful.
Not on its own. FSH fluctuates more between cycles than AMH does, which is why it has largely been replaced as a first-line marker. Most units repeat it and read it alongside AMH and antral follicle count before drawing any conclusion.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
FSH is interpreted alongside estradiol, AMH and AFC, never alone. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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