The reference values for testosterone in men are generally: puberty (late): 100-200ng/L; adult: 300-1000ng/L. Some tests are measured in moles, and the reference values are: total testosterone 9.45-37.5nmol/L and free testosterone (276±80) pmol/L. Testosterone is mainly secreted by the testes in males, and also in small amounts by the adrenal cortex and ovaries in females. It is responsible for maintaining muscle strength and mass, maintaining bone density and strength, and enhancing bodily functions, etc. It is usually checked biochemically by blood sampling. Increased testosterone levels are seen in testicular mesenchymal stromal cell tumors and male precocious puberty. Decreased testosterone values are usually seen in primary microtesticulosis, testicular hypoplasia, and olfactory nerve-hypoplasia syndrome. If the testosterone value is abnormal, it is recommended to go to a regular medical institution for examination to identify the cause of the disease.