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RESULTS: Three hundred and twenty four total urinalyses were reviewed. One hundred and twenty five urinalyses were classified as normal (39%), 182 (56%) as hematuria (?:. 3 RBC/hpf), and 17 (5%) as pyuria/bacteriuria. Etiologic factors for gross hematuria were bladder lesion/tumor (26%), renal calculus (7%), and ureteral calculus (5%), whereas for microscopic hematuria renal calculus (16%), bladder lesion/tumor (15%), and infection (11%). Fifty-five percent of patients were found to have a negative hematuria evaluation. The sensitivity and specificity for detecting hematuria in our cohort was 32% and 28%, respectively. Serial evaluation did not significantly change the sensitivity and specificity of urinalysis (35% and 23% for two urinalyses and 43% and 11% for three urinalyses, respectively) in detecting hematuria. CONCLUSIONS: In the evaluation of patients with suspected hematuria, serial urinalyses have …