Abstract
Summary
1. Lactic dehydrogenase is present in high concentration in normal human semen and in seminal fluid of azoospermic individuals. 2. As compared to normal human blood plasma, LD activity of seminal fluid is high and is comparable to values obtained from tissue fluids which contain or bathe growing malignant cells. 3. There appears to be a semi-qualitative relationship between LD activity of semen and its content of spermatozoa but a considerable portion of LD activity is present in sperm-free seminal fluid. The latter activity seems to be derived principally from the prostatic secretions.
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