Day 2–5 hormone testing

Early-cycle hormone tests, usually taken between day 2 and day 5 of the period, typically include FSH, LH and oestradiol, and sometimes prolactin and TSH. Timing matters because these hormones change across the cycle, and a raised early FSH with low oestradiol suggests the ovaries are working harder to recruit follicles.

Also known as: day 3 bloods, baseline hormones, day 2 bloods

Last reviewed: 8 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.