PSA levels are measured through a blood test. The test quantifies the concentration of PSA in the blood, usually reported in nanograms per milliliter (ng/mL). Different thresholds are used to determine what constitutes an elevated PSA level, often taking into account factors such as age and race. A higher-than-normal PSA level may prompt further diagnostic procedures, such as a digital rectal exam (DRE) or a prostate biopsy.
