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Day-3 FSH interpreter calculator

Is my FSH high?

Q: Why measure estradiol too?

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.

Q: My FSH varies between cycles. Which is right?

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.

Q: Should I be worried about a single high reading?

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.

Baseline FSH and what a raised level does and does not indicate.

FSH

IU/L

Day 2–3 of your cycle

Estradiol

pg/mL

Same sample

These are example numbers. Replace them with yours, then press Calculate.

Example answer

6.5IU/L

<10

Within the normal baseline range. FSH is a crude marker and a normal value does not exclude reduced reserve.

This is a guide, not a diagnosis. Share the result with your doctor.

Your result on the scale

The ranges this calculator uses. Yours is highlighted.

Your numbers

Everything worked out from what you entered.

FSH: 6.5 IU/L
Estradiol: 45 pg/mL
E2 interpretation: Within range for a baseline sample

What each result means

Your result is highlighted. Your own clinic's advice always comes first.

Your result<10

Within the normal baseline range. FSH is a crude marker and a normal value does not exclude reduced reserve.

Your result10–15

Borderline raised. Often prompts a look at AMH and AFC, which are more informative.

Your result15+

Raised, suggesting the pituitary is working harder to recruit follicles. Interpreted alongside estradiol — a high estradiol can suppress FSH and mask a higher underlying value.

Where this fits in your journey

The usual order, from trying to conceive to pregnancy. Not everyone needs every stage. This calculator belongs to stage 2.

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This calculator: Is my FSH high?

Calculators for what comes next

How this is worked out

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.

About this calculator

?What it tells you

Day-3 FSH from your blood test. Baseline FSH and what a raised level does and does not indicate.

✓When to use it

After day 2–3 bloods, alongside AMH rather than instead of it

iWhat you need

FSH (IU/L)
Estradiol (pg/mL)

!What it cannot tell you

FSH is interpreted alongside estradiol, AMH and AFC, never alone.

Common questions

Why measure estradiol too?

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.

My FSH varies between cycles. Which is right?

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.

Should I be worried about a single high reading?

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.

Sources

FSH must be measured on day 2–3 with a simultaneous estradiol. It is now generally regarded as less informative than AMH and AFC.

In an emergency

If you have any of the warning signs listed here, don't wait for a test result or a calculator. Get help now.

112All emergencies, anywhere in India 108Ambulance

Also call your IVF clinic. Most clinics give an emergency number on your treatment or discharge sheet. Save it in your phone now, before you need it.