Human Infertility

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Abstract
Elsewhere in this issue Collins et al. eloquently call attention to a long-known but poorly understood fact of human infertility: a substantial portion of patients will conceive while under study or after cessation of treatment.1 The call these authors make for a controlled scientific approach to the study of old and new therapies is well founded.We can quibble with small points in their report—for instance, their rather casual dismissal of the influence of diagnostic tests on the occurrence of pregnancy. Thus, "post-test pregnancies" are assigned to the "treatment-independent" group. Some patients will conceive within a short time after almost . . .