When to book each hormone test
Test	Best time
FSH, LH, oestradiol	Day 2 to 5 of your cycle
Fertility, Well Woman, Perimenopause and PCOS profiles	Day 2 to 5 of your cycle
Progesterone (day 21)	About 7 days before your next period is due
AMH	Any day of your cycle
Testosterone, SHBG, free androgen index	Any day, in the morning

How to count cycle days

Day 1 is the first day of full bleeding, not spotting. Day 2 to 5 is the early part of your cycle, when FSH, LH and oestradiol are usually measured.

Irregular or absent periods

If your periods are irregular or have stopped, you can test on any day. Tell us when you book so your results can be read correctly.

Contraception and HRT

The pill, hormonal coils, implants and HRT all change hormone results. Talk to us before booking if you use any of them.

Morning appointments

Testosterone, cortisol and some other hormones are highest in the morning, so book before 11am where you can.

When should I book?

First day of your last period

When should I book?

First day of your last period Usual cycle length

Please note: this guide is general information and doesn’t replace advice from your GP. If you feel very unwell, call NHS 111, or 999 in an emergency.

Tests mentioned in this guide

Women’s health