Days Post 5-Day Transfer (DP5DT)

Definition - What does Days Post 5-Day Transfer (DP5DT) mean?

Days post 5-day transfer is a term used to count the days that have passed since an embryo was transferred to a uterus during an in vitro fertilization (IVF) procedure. In this case, a 5-day embryo called a blastocyst is transferred (as opposed to a 3-day cleavage embryo). Most commonly, tracking days post transfer is done to identify the optimal day to take a pregnancy test.

FertilitySmarts explains Days Post 5-Day Transfer (DP5DT)

The multi-step IVF process involves retrieving eggs, fertilizing them in a laboratory with sperm, and allowing the resulting zygotes to develop in a lab. The embryos that result from this process can be transferred to a uterus at either 3 or 5 days after fertilization depending on a number of factors. When the embryos are permitted to develop for 5 days they reach the blastocyst stage and the embryologists can see which blastocysts are developing properly. This allows them to choose the best, most viable embryos for transfer.

The following is a day-to-day list of what might occur after a successful embryo transfer:

  • 1DP5DT: Day 1 post 5-day transfer, the blastocyst starts hatching out of its shell and cells continue to divide.
  • 2DP5DT: Day 2 post 5-day transfer, the blastocyst continues to hatch and attaches itself to the uterine lining.
  • 3DP5DT: Day 3 post 5-day transfer, the blastocyst digs deeper into the lining and begins the process of implantation.
  • 4DP5DT: Day 4 post 5-day transfer, the blastocyst attaches itself to the blood supply held by the endometrium of the uterus.
  • 5DP5DT: Day 5 post 5-day transfer, implantation is generally complete, and the embryo has divided into cells that will become the placenta and cells that will become the fetus.
  • 6DP5DT: Day 6 post 5-day transfer, the placenta starts to secrete human chorionic gonadotropin (hCG), the hormone that is sensed by pregnancy tests.
  • 7DP5DT: Day 7 post 5-day transfer The embryo is now considered to be a fetus and the placenta continues to grow and produce hCG.
  • 9DP5DT: Day 9 post 5-day transfer, the blood stream contains enough hCG for a home pregnancy test to be effective, although another should be done in two days. Even better, a blood test is more reliable.
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