Hypogonadism Differential Diagnosis Algorithm
 • Low testosterone, Normal or low LH, Normal or low FSH - Secondary or tertiary hypogonadism
 • Normal testosterone, Normal  LH, Normal  FSH - Consider other etiologies
 • Normal testosterone, Normal LH, Elevated FSH - Seminiferous tubule disease
 • Low testosterone, Elevated LH, Elevated FSH - Primary hypogonadism

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