Our expert says:
It is true that different protocols are used by different fertility units. According to the literature it may not be necessary to use progesterone supplementation beyond the first few, two or three weeks of embryo transfer. However since many patients experience a drop in progesterone around about 63-70 days into the pregnancy most practitioners will continue progesterone replacement or supplementation up to 10 weeks to avoid the so-called luteal placental shift phenomenal.
Answered by: Dr M.I. Cassim
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