Basal body temperature chart as a guide for donor insemination.

The use of BBT in a single donor insemination and the conception rate according to cycle day was studied. For 107 such cycles, inseminations were performed on day 0 in 21.5% of cycles, on days-1,+1 and –2 in 17.8%, 16.8% and 13.1% respectively. The overall pregnancy rate achieved was 44%. The success rate per cycle was 15%, and the highest success rates were obtained on day 0 (43.7%) and day –1 (31.2%). No pregnancies occurred when insemination was done before day -3 and beyond day +1. In conclusion BBT provides a reasonable guide to the 2-to 3-day period on either side of the nadir in donor insemination.