A hematocrit test, or HCT, measures the percentage of your blood volume that is made up of red blood cells. It is typically part of a complete blood count (CBC).
Testosterone is the primary male sex hormone, produced mainly in the testes.
PSA is a protein produced by prostate cells. A PSA blood test is used primarily to screen for prostate cancer.
Estradiol (E2) is the primary form of estrogen. In men, a small amount of testosterone is converted into estradiol. A "sensitive" test is used for more precise measurements of low concentrations.
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