12
key fertility markers covered
TSH 2.5
mIU/L fertility threshold vs 4.0 lab normal
70 mcg/L
ferritin fertility target vs 30 lab minimum
150 nmol/L
Vitamin D fertility target vs 50 lab normal
Fertility-Optimal Reference Ranges
Your Fertility Lab Guide
Click any marker to see what it measures and why the fertility-optimal range differs from the laboratory normal.
| Marker | When to Test | Lab Normal | Fertility Optimal | Concern |
|---|---|---|---|---|
AMH Anti-Müllerian Hormone | Any day of cycle | > 1.0 pmol/L | > 15 pmol/L | < 5 pmol/L |
FSH Follicle-Stimulating Hormone | Day 2–3 of cycle | 3–10 IU/L | < 8 IU/L | > 10 IU/L |
LH Luteinising Hormone | Day 2–3 (baseline) or mid-cycle (surge) | 2–15 IU/L | < 7 IU/L (Day 2–3) | LH:FSH > 2:1 (PCOS) |
Oestradiol (E2) Oestradiol | Day 2–3 of cycle | < 200 pmol/L | < 150 pmol/L | > 200 pmol/L (Day 2–3) |
Progesterone Mid-Luteal Progesterone | Day 21 (or 7 days post-ovulation) | > 16 nmol/L (confirms ovulation) | > 30 nmol/L | < 16 nmol/L |
TSH Thyroid-Stimulating Hormone | Any time | 0.4 – 4.0 mIU/L | 0.5 – 2.5 mIU/L | > 2.5 mIU/L (fertility context) |
Prolactin Prolactin | Morning, fasting, unstressed | < 500 mIU/L | < 400 mIU/L | > 700 mIU/L |
Testosterone (free) Free Testosterone | Day 2–5 of cycle | 0.3 – 2.5 nmol/L (total) | Lower end of range | Elevated (polycystic ovary syndrome (PCOS), adrenal) |
SHBG Sex Hormone-Binding Globulin | Any time | 30 – 120 nmol/L | > 60 nmol/L | < 30 nmol/L (insulin resistance) |
Ferritin Ferritin (iron stores) | Any time (fasting preferred) | 30 – 300 mcg/L | > 70 mcg/L | < 30 mcg/L |
Vitamin D 25-OH Vitamin D | Any time | > 50 nmol/L | 100 – 150 nmol/L | < 75 nmol/L |
HbA1c Glycated Haemoglobin | Any time (reflects 3-month average) | < 5.7% (< 39 mmol/mol) | < 5.5% (< 37 mmol/mol) | > 5.7% |
Reading Your Fertility Labs — Quick Reference
One-page PDF cheat sheet · Supplement doses, food priorities & action steps
Your Protocol
Action Plan
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