[Comparative studies on doses of complement for detection of sperm immobilizing antibody in serum, cervical mucus and seminal plasma (author's transl)].

In Isojima's sperm immobilization test, the complement is one of the most important factors which influence on sensitivity of the test. Previously we reported that more than 10 CH50 of guinea pig serum complement was necessary in the reaction to obtain the best result for measuring the sperm immobilizing antibody in the serum. This time, the influences of various test specimens on complement activities for the sperm immobilization test were studied and the necessary amounts of complement to detect the sperm immobilizing antibody in serum, cervical mucus and seminal plasma were compared. In the sperm immobilization test, the following results were obtained: 1. The amount of complement (guinea pig serum) added was 11.9 CH50, and after 60 minutes incubation at 32 degrees C in veronal buffer (VB2+), 2.0 +/- 0.3 (M +/- SD) of CH50 was consumed. 2. When human serum, cervical mucus and seminal plasma were added to the reaction as specimens, the complement consumptions (M +/- SD) were more 0.2 +/- 0.3 CH50, 0.2 +/- 0.2 CH50 and 3.3 +/- 0.8 CH50 than that of VB2+ buffer respectively. 3. When the washed human spermatozoa were added, the consumed amounts of complement (M +/- SD) were dose dependent; 3.5 +/- 0.7 CH50 for 100 X 10(4) spermatozoa, 7.3 +/- 0.3 CH50 for 200 X 10(4) spermatozoa and 15.7 +/- 2.2 CH50 for 400 X 10(4) spermatozoa. 4. In our sperm immobilization test, the net consumptions of complement (M +/- SD) were 5.0 +/- 0.7 CH50 for specimen of serum, 4.9 +/- 0.8 CH50 for specimen of cervical mucus and 11.1 +/- 1.2 CH50 for specimen of seminal plasma. 5. Complement doses necessary to obtain the most sensitive sperm immobilization tests were 10 CH50 for both serum and cervical mucus specimens, and 15 CH50 for seminal plasma specimen.