The evaluation of an enlarged prostate gland begins with a medical history and physical examination. Benign prostatic hyperplasia may be detected during a digital rectal exam.
Additional tests may be performed, in order to determine the size of the prostate.
Tests that may be used to evaluate an enlarged prostate include:
- Prostate specific antigen blood test
- Urine culture
- Ultrasound of the prostate
- Urine flow rate studies
- Voiding pressure studies
- Measure the pressure inside the bladder during urination
- Prostate biopsy
Less common tests used to evaluate an enlarged prostate include:
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- Comhaire F, Mahmoud A. Girman CJ, Jacobsen SJ, Guess HA, et al: Natural history of prostatism: relationship among symptoms, prostate volume and peak urinary flow rate. J Urol 1995 May; 153(5): 1510-5. 
- Milani S, Djavan B. Lower urinary tract symptoms suggestive of benign prostatic hyperplasia: latest update on alpha-adrenoceptor antagonists. BJU Int. 2005 Jun;95 Suppl 4:29-36. 
- Preventing diseases of the prostate in the elderly using hormones and nutriceuticals. Aging Male. 2004 Jun;7(2):155-69.