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What is the Optimal Progesterone Level a Day Before Embryo Transfer?

For a Frozen Embryo Transfer (FET), the ideal serum progesterone level one day before embryo transfer depends on whether progesterone is given via injections, vaginal tablets, or both.

📌 Ideal Progesterone Levels (One Day Before Embryo Transfer)

✅ Above 10 ng/mL (30-40 nmol/L) if taking progesterone injections.
✅ Above 10-15 ng/mL (30-50 nmol/L) if using vaginal progesterone (Susten 400mg).
✅ Below 1.5 ng/mL (5 nmol/L) before starting progesterone – If progesterone was not started at the right time, high levels before transfer might indicate early exposure, which can affect implantation.

🚨 Why Is Progesterone Important?

✔ Supports endometrial receptivity – Ensures the lining is ready for implantation.
✔ Reduces uterine contractions – Prevents early embryo dislodgment.
✔ Prepares for pregnancy maintenance – Prevents early miscarriage risk.

📌 What If Progesterone Is Low Today?

🔹 Below 10 ng/mL? – Doctor may increase progesterone injection dosage or add vaginal support.
🔹 Too high (>20 ng/mL)? – May indicate early exposure; the doctor might reschedule transfer or adjust medication.

✅ A progesterone blood test today helps confirm if levels are within range before transfer.

Disclaimer

The information provided in this blog is for educational and informational purposes only and is not intended as medical advice. While every effort has been made to ensure accuracy, the content is based on general research, nutritional principles, and personal insights.

Individual health conditions, fertility treatments, and dietary needs vary from person to person. Always consult with your fertility specialist, doctor, or a registered dietitian before making any changes to your diet, supplements, or treatment plan, especially during fertility treatments like IVF, IUI, or embryo transfer.

This blog does not claim to diagnose, treat, cure, or prevent any medical conditions. The author and publisher are not responsible for any adverse effects resulting from the use of the information provided.

If you have any specific medical concerns, please seek professional medical advice from a qualified healthcare provider.

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