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Testosterone
Total Testosterone
The primary male sex hormone responsible for muscle mass, bone density, red blood cell production, and sex drive.
What It Measures
The total amount of testosterone in your blood, both bound and unbound.
Reference Range
250 ng/dLOptimal: 500–900 ng/dL1100 ng/dL
Optimal levels for men are typically 500-900 ng/dL, though labs list 250-1100 as the normal range.
If High
May indicate steroid use, tumors, or hyperthyroidism. Can cause aggression, acne, and sleep apnea.
If Low
Can cause fatigue, low libido, erectile dysfunction, depression, loss of muscle mass, and increased body fat.