Best Blood Test for Fertility Planning (Women, UK)

If you are planning a family or thinking about freezing eggs, a fertility-focused blood test gives you a baseline view of your reproductive hormones. It is not a complete fertility workup (which requires clinical assessment including imaging), but it surfaces useful information for conversations with your GP or a fertility specialist.

What fertility blood tests can and cannot tell you

Blood tests can show ovarian reserve via AMH, and how your reproductive hormones cycle via FSH, LH, oestradiol and progesterone. They can also surface thyroid issues that affect fertility.

Blood tests cannot confirm whether you will conceive easily. Fertility depends on many factors including fallopian tube and uterine health, partner factors and lifestyle. Blood tests are one piece of the puzzle.

Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional.

Markers that matter for fertility

AMH (Anti-Müllerian Hormone): Best single marker of ovarian reserve. Falls naturally with age. Can be tested any day of the cycle.

FSH and LH: Tested on day 3 of cycle. High FSH suggests reduced ovarian reserve. Useful in context with AMH and age.

Oestradiol: Tested on day 3 alongside FSH.

Progesterone: Tested on day 21 to confirm ovulation.

Thyroid (TSH, free T4): Untreated thyroid issues affect fertility and pregnancy outcomes.

Prolactin: Elevated prolactin can interfere with ovulation.

What about male partners?

Male fertility is not assessed via the same hormonal panel. Sperm analysis is the gold standard and requires a specialist semen test. Chxhealth offers Testosterone Monitoring and Endocrinology panels for male hormones, which can complement a clinical fertility assessment.

Best Chxhealth panels for this

The Chxhealth panels below are designed for the markers discussed above. Each comes with a plain English PDF report, lab analysis by Randox (UKAS, ISO 15189), and the phlebotomy fee included in the price.

Related biomarker guides

Read more about the specific markers discussed in this guide:

• AMH
• Oestradiol
• Progesterone
• TSH
• Free T4

FAQs

What is AMH and why does it matter?

AMH is produced by small developing follicles in the ovary and reflects ovarian reserve. It declines naturally with age. AMH does not predict egg quality, only quantity. Read more in our AMH glossary entry.

When in the cycle do I test fertility hormones?

Day 3 of your cycle for FSH, LH and oestradiol. Day 21 (or 7 days before expected period) for progesterone. AMH any day.

Can low AMH mean I cannot conceive?

No. Low AMH means fewer eggs in reserve, but it does not predict whether you will conceive naturally. Many women with low AMH conceive without intervention.

Does Chxhealth offer fertility treatment?

No. Chxhealth provides blood testing and reports only. Fertility treatment is provided by specialist clinics. Your Chxhealth report can be useful information to take into a fertility consultation.

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About this guide. Educational content for general awareness. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional. For medical advice about your health or results, please speak to a qualified clinician.