Days Post 3-Day Transfer (DP3DT)

Definition - What does Days Post 3-Day Transfer (DP3DT) mean?

Days post 3-day transfer is a term used for in vitro fertilization (IVF) patients to track the number of days that have passed since an embryo was transferred into a uterus. In this case, it is a 3-day embryo that is transferred (as opposed to a 5-day embryo). The number of days post transfer is generally tracked to determine the optimal day to take a pregnancy test.

FertilitySmarts explains Days Post 3-Day Transfer (DP3DT)

During the process of IVF, eggs are retrieved, fertilized by sperm in a laboratory, and the resulting zygotes are allowed to mature in a lab setting. Embryos can be transferred to a uterus at either 3 or 5 days after fertilization depending on a number of factors. When only a small number of embryos are dividing and growing as expected in the lab, it is usually evident after only three days which ones are the highest quality. Therefore, a transfer can be done after three days to provide these embryos with the ideal environment inside the uterus in order for them to grow, develop, and implant properly.

Here is a breakdown of the events that follow a 3-day embryo transfer:

  • 1DP3DT: At 1 day post 3-day transfer, the embryo continues to grow and develop.
  • 2DP3DT: At 1 day post 3-day transfer, the embryo develops into a blastocyst.
  • 3DP3DT: At 1 day post 3-day transfer, hatching occurs, where the blastocyst hatches out of its outer shell.
  • 4DP3DT: At 1 day post 3-day transfer, the blastocyst attaches to a point on the lining of the uterus.
  • 5DP3DT: At 1 day post 3-day transfer, the blastocyst begins to dig into the uterus lining, starting implantation.
  • 6DP3DT: At 6 days post 3-day transfer, implantation continues, burying the blastocyst deeper.
  • 7DP3DT: At 7 days post 3-day transfer, implantation is generally complete and the blastocyst has divided into fetal cells and placental cells.
  • 8DP3DT: At 8 days post 3-day transfer, the cells making up the placenta start to secrete human chorionic gonadotropin (hCG) – this is the hormone that is detected by pregnancy tests.
  • 11DP3DT: At 11 days post 3-day transfer, hCG in the blood stream reaches a level high enough to be detected by a home pregnancy test, although another should be done 2 days later to be sure. A blood test can also be done, which is more accurate and reliable.
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