How many days after blastocyst transfer can pregnancy be detected?
Apr 18, 2023
Source: Cainiu Health
Dr. Lv Aiming
Introduction
After the blastocyst implants and develops in the endometrium, it releases human chorionic gonadotropin (hCG). Around 7 days later, a blood test can be performed to measure hCG levels and determine whether pregnancy has occurred. Alternatively, if using urine with a pregnancy test strip, the test can be done around 14 days when hCG levels have increased sufficiently, allowing for a clear determination of pregnancy through urine testing.
The time required to confirm pregnancy through blastocyst testing generally depends on the testing method used, and may be around 7 days or approximately 14 days.
1. Around 7 days
A blastocyst typically refers to a frozen embryo used in in vitro fertilization (IVF). If the embryo successfully implants and begins developing in the uterine lining after transfer, it usually starts releasing human chorionic gonadotropin (hCG). At this point, a blood test to measure hCG levels can be performed about 7 days later to determine whether pregnancy has occurred.
2. Around 14 days
If urine testing using a home pregnancy test strip is chosen after successful implantation and development of the blastocyst, results may be less reliable initially because hCG levels in urine are relatively low during early pregnancy, potentially leading to false-negative results. Therefore, waiting until around 14 days post-transfer, when hCG levels have risen sufficiently, allows for a more accurate determination of pregnancy through urine testing.
If pregnancy is confirmed, it is recommended to promptly visit the obstetrics and gynecology department at a hospital, strictly follow medical advice, proactively avoid potential risks, and undergo regular prenatal checkups.
