INSL3 resembles testosterone as a sensitive marker of testicular suppression and reflects Leydig cell function, also during exposure to exogenous testosterone. Serum INSL3 measurements may complement testosterone as a Leydig cell marker in male reproductive disorders, during therapeutic testicular suppression as well as in surveillance of illicit use of androgens.
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Albrethsen et al. (2023) studied this question.
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