What is Frozen Embryo Transfer (FET)
Frozen Embryo Transfer (FET) A frozen embryo transfer cycle is initiated by administering an oral contraceptive (OC) to the recipient. This is later overlapped with Lupron daily for 5-6 days. The oral contraceptive is then withdrawn, but the daily Lupron injections are continued until the onset of menstruation. Next, the Lupron dosage is reduced and intramuscular (IM) estradiol valerate (Delestrogen) is administered every 3 days. The objective of the estradiol is to achieve and sustain an optimal plasma E2 concentration of 500pg/ml-1000pg/ml and a 9mm endometrial lining as assessed by ultrasound examination. Intramuscular and/or intravaginal progesterone is administered daily starting about 6 days prior to the FET and continued along with twice weekly IM Delestrogen until the 10th week of pregnancy or until it has been confirmed that the patient is not pregnant.
Daily oral dexamethasone commences with the Lupron start and continues until a negative pregnancy test or until the completion of the 8th week of pregnancy. Then it is tapered down and discontinued. The recipient also receives prophylactic oral antibiotics starting with the initiation of Progesterone therapy, until the day after ET. Usually we would thaw vitrified blastocysts with the objective of having 1, 2 or 3 for transfer; depending on a couple’s stated preference. Commencing on the day following the ET, the patient inserts a vaginal progesterone suppository daily and this is continued until the completion of the 8th week of pregnancy or until a negative pregnancy test.
As an alternative regimen for women who cannot tolerate intramuscular Progesterone (PIO), we prescribe either Crinone vaginal gel or Endometrin vaginal inserts according to protocol. If you’d like to explore one of these options, talk to your physician. For blastocyst FET’s, the blood pregnancy tests are performed 13 days and 15 days after the first progesterone administration is commenced.