Infertility is defined as the inability to conceive after 12 months of unprotected sexual intercourse. The causes of infertility are outlined in Fig. 178-4. Male infertility is discussed in Chap. 177: Disorders of the Male Reproductive System.

FIGURE 178-4
Causes of infertility. FSH, follicle-stimulating hormone; LH, luteinizing hormone.

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