Lab Reports Decoded

FSH & LH: Why Day 2 Tests Matter & PCOS Ratio Myth (Video)

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Read the full written guide: FSH and LH Report: Day 2 Hormones, PCOS Ratio and Menopause →

Learn what the FSH and LH numbers really mean, why the timing of the blood draw is crucial, and why the LH:FSH ratio is no longer a PCOS diagnostic tool. We break down the science into everyday language you can use today. If you’re tracking your cycle or planning a fertility work-up, this video gives you the practical steps to prepare for a day-2 hormone test and the red-flag signs that warrant a doctor’s visit. Remember, this is general information, not medical advice.

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Transcript

Did you know a high FSH on day 2 can hint at menopause?

Did you know a high FSH on day 2 can hint at menopause?

FSH & LH Explained

We’ll unpack what those two hormone numbers really mean and why the timing of the blood draw matters.

Hormones as a coach

Think of the pituitary as a coach shouting ‘FSH!’ to start the egg-building game, then a loud ‘LH!’ whistle when the egg is ready to pop out. The coach listens to estrogen feedback and quiets down when the ovaries are doing well.

Why early cycle?

Early in the period the hormone levels are at their lowest and most comparable, so a high FSH jumps out, while a mid-cycle LH surge would look alarming for no reason. If you have no periods, doctors may pick any day after a short medication course to provoke a bleed.

Upper FSH limit

Many clinics start raising eyebrows when a day-2 FSH climbs above about 25 IU per litre.

Reading the numbers

Typical lab ranges shift with the cycle: early days show low-to-moderate values, mid-cycle a brief LH spike, and after menopause both hormones stay high. Remember to compare your result to the reference range printed on the same report, because labs vary.

The same FSH number can be normal in one column and worrying in another. The cycle day decides.

Prep for day-2 test

Mark the first day of full red flow as day 1, schedule the blood draw on day 2 or 3 preferably in the morning, and let the lab know if you’re on the pill or nursing. Avoid heavy exercise the night before and stay hydrated for a smoother draw.

The one timing tip

The key takeaway: schedule your hormone blood draw on day 2 or 3 of your period for reliable FSH and LH values. A high FSH may hint at a shrinking egg reserve, and if periods stop for three months or more you should see a doctor.

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Read the full guide

The full guide is on thecareonline.com. General information only, so check with your doctor for your own case.

Nothing on The Care Online is medical advice. Traditional practices are described as tradition, not as fact. Take a persistent or serious concern to a qualified professional. See how videos and posts are made on our methodology page.