Day 2/3 Fertility Hormone Tests Explained

Fertility clinics often ask for blood tests on Day 2 or 3 of the menstrual cycle. These hormones provide a snapshot of ovarian function, reproductive health and how the body is preparing for ovulation. --- Which Hormones Are Tested? 1. FSH (Follicle-Stimulating Hormone) Indicates how hard the brain is working to stimulate follicles High FSH may indicate reduced ovarian reserve For a detailed breakdown, see our FSH Levels by Age Guide. 2. LH (Luteinising Hormone) Helps regulate ovulation and follicle development High LH can signal PCOS or irregular ovulation 3. Oestradiol (E2) Shows how active the ovaries are early in the cycle High E2 can artificially suppress FSH results 4. AMH (Anti-Müllerian Hormone) Not cycle-dependent, but often interpreted with Day 2/3 tests Reflects ovarian reserve For more on AMH, see our AMH Test Guide. --- Typical UK Reference Ranges These vary by lab, but typical values are: | Hormone | Normal Range | |---------|-------------| | FSH | 4–10 IU/L | | LH | 2–12 IU/L | | Oestradiol | 70–200 pmol/L | | AMH | Varies by age | --- What Day 2/3 Tests Tell You These tests help identify: Expected IVF response Hormone patterns that may affect ovulation Potential PCOS indicators Menopausal transition signs Ovarian reserve context They do not measure egg quality directly. --- How Results Affect Treatment Your Day 2/3 results help clinics: Choose appropriate IVF me