- the fifth wheel position on the lead trailer of a B Train must not be located more than 0.3. meters behind the center of the last axle on the lead semitrailer. Weight Limits: - the steering axle weight limit on straight trucks was increased to 7250 kg. - weight limit caps on the second trailer of A and C train double trailer combinations were. removed and replaced by the requirement that the weight of the tractor drive axles + the.
Conclusion. A single serum 2-hCG level on d 11 after embryo transfer has good predictive value for clinical pregnancy outcome in controlled ovarian stimulation cycles and helps to plan the subsequent follow-up.o assess the clinic value of a single maternal serum beta-human chorionic gonadotropin (2-hCG) assay 11 d after embryo transfer in ART pregnancies and to predict pregnancy outcome. A total of 384 pregnancies after embryo transfer were included.
The embryos were then transferred to recipient women. They had pregnancies when the recipient's cycle was from 4 days in front of to 3 days behind the donor's uterus at ovulation. This suggests a window of implantation of up to 7 days. Navot et al, in 1991 reported on donor embryo transfers done with 2-3 day old embryos on recipient cycle days 15-20 (artificial cycles controlled with meds). Pregnancies resulted from transfers on all days. This suggests a window of at least 6 days.