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29 Φεβ 2020 · In these men, tests for the free (or non-SHBG/bioavailable) testosterone fraction testosterone) are helpful for an accurate diagnosis. If testosterone deficiency is confirmed, the next step is to differentiate between primary and secondary hypogonadism by measuring LH and FSH.
Serum FSH and LH levels are usually ≤ 5 mIU/mL (5 IU/L) before puberty and between 5 and 15 mIU/mL (5 and 15 IU/L) in adulthood. Semen analysis should be done in all men who are seeking fertility treatment.
Elevated LH and FSH values indicate primary (testicular) hypogonadism, whereas low or importantly even inappropriately ‘normal’ LH and FSH values may indicate secondary (pituitary–hypothalamic) hypogonadism.
30 Αυγ 2024 · Testosterone is the primary male hormone that plays a considerable role in regulating sex differentiation and producing male sex characteristics. 1 It influences puberty, contributing to the development of muscles, deepening the voice, and promoting hair growth.
The initial laboratory testing should include a morning blood sample for testosterone, prolactin, FSH, and LH levels. A semen analysis is needed if fertility potential is at issue.
FSH levels can be detected using a simple blood test. Normal FSH levels in adult males are typically between 1.5 to 12.4 mIU/mL. However, what counts as a normal value may vary from lab to lab, as some labs have different testing standards.
The first step in establishing aetiology is measuring serum luteinising hormone (LH) and follicle stimulating hormone (FSH) levels (Supplementary Figure S1 and Supplementary Box S1).
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