02/05/2024
Tests for testosterone levels are done by sampling the blood early in the morning when levels of testosterone are highest. Your doctor may want to run a second test a few days later to check for consistency in testosterone levels measured. Normal testosterone levels range from about 300 to 1000 nanograms per deciliter (ng/dL), although some labs consider 200 ng/dL the cutoff for low testosterone. Your doctor will help interpret the tests for you.