Evaluation and Treatment Approach for Microhematuria in Males

Definition and Initial Assessment

Males with microscopic hematuria should undergo a thorough risk-stratified evaluation including urinalysis confirmation, assessment for benign causes, and appropriate imaging and cystoscopy based on risk factors, as microhematuria carries a 2.6-4% risk of urologic malignancy in this population 1, 2
Microscopic hematuria is defined as ≥3 red blood cells per high-power field on microscopic evaluation of urinary sediment from 2 of 3 properly collected urinalysis specimens 3, 4
Dipstick positivity should always be confirmed with microscopic examination due to limited specificity (65-99%) 3, 4
Initial assessment should exclude benign causes including vigorous exercise, sexual activity, viral illness, trauma, and infection 5, 4
For suspected urinary tract infection, obtain urine culture before antibiotic therapy 1, 4

Risk factors for significant urologic disease in males with microhematuria include age >35 years, smoking history, occupational exposure to chemicals or dyes, history of gross hematuria, history of urologic disease, irritative voiding symptoms, history of urinary tract infection, analgesic abuse, history of pelvic irradiation, exposure to carcinogens or chemotherapy, and chronic indwelling foreign body 1, 6

Complete urinalysis with microscopic examination should be performed for all patients 4, 5
Urine culture to exclude infection should be performed for all patients 1, 4
Serum creatinine and BUN to assess renal function should be performed for all patients 5, 4
High-risk males should undergo CT urography and cystoscopy 1, 6

Nephrology referral is indicated if proteinuria >500 mg/24 hours, red cell casts, or predominantly dysmorphic RBCs are present 5, 4
Urology referral for cystoscopy and imaging is recommended for non-glomerular source without benign cause 4
Use of anticoagulants does not alter the need for urologic evaluation 1, 2

For patients with negative initial evaluation but persistent hematuria, repeat urinalysis at 6, 12, 24, and 36 months 4
Consider additional evaluation if development of gross hematuria, significant increase in degree of microscopic hematuria, new urologic symptoms, or development of hypertension or proteinuria occurs 6, 4