When will a Day-5 Blastocyst Implant?

April 18, 2013

When will a Day-5 Blastocyst Implant? This is very important since it will determine when HCG level can be detected – when can we start doing HPT!

As usual, we Googled and Below is the research result.

Timing of embryo implantation in humans

A good study of implantation was published in 1992 by Bergh & Navot. They studied 33 pregnancies from egg donation or frozen-thawed cycles (FET) with serial blood HCG levels on the mothers to find the time of the “first embryonic signal”. The HCG assay used could detect very low levels of HCG – the pregnancy hormone.

  • Average first detection of HCG was at an embryonic age of 7.1 days
  • The range of first detection was 6.6 to 7.4 days

Human blastocysts should hatch from the shell and begin to implant 1-2 days after day 5 IVF blastocyst transfer.

Therefore, the first a few days after blastocyst transfer are the most important days!

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