The Answer is D
Statement D is NOT true - renal (glomerular) causes do NOT account for the majority of hematuria cases; urologic causes, particularly bladder pathology, are far more common.
Analysis of Each Statement
Statement A: Definition (TRUE)
The 2025 AUA/SUFU guidelines define microhematuria using a threshold of ≥3 RBC/HPF 1. While the guidelines now use a single urinalysis for risk stratification rather than requiring 2 measurements, the traditional definition of "significant" hematuria at >3 RBC/HPF remains fundamentally accurate. The 2013 American Family Physician article also confirms this threshold 2.
Statement B: Incidental Finding (TRUE)
Hematuria is frequently detected incidentally. The 2025 AUA/SUFU guidelines note that screening studies show microhematuria prevalence of 2.4% to 31.1% among healthy volunteers 1, indicating it is commonly discovered during routine testing rather than symptomatic presentation.
Statement C: Renal and Extra-renal Causes (TRUE)
The guidelines explicitly list both categories:
- Urologic (extra-renal) causes: malignancy, infection, inflammation, calculus disease, benign prostatic hyperplasia, anatomic abnormalities 1
- Renal causes: medical renal disease, glomerular pathology 1
Statement D: Renal Causes >90% (FALSE - This is the Answer)
This statement is definitively incorrect. The evidence shows:
- Most hematuria is urologic, not renal: The 2025 guidelines emphasize that "most cancers diagnosed among persons with hematuria are bladder cancers" 1
- Urologic causes dominate: Common causes include urinary tract infection, benign prostatic hyperplasia, and urinary calculi - all extra-renal 3, 2
- Hematuria accounts for >20% of urology evaluations 1, indicating the predominance of urologic rather than nephrologic pathology
The statement claiming renal causes account for >90% of cases contradicts the fundamental premise of the AUA guidelines, which focus on detecting urologic malignancies and other urologic pathology as the primary concern.
Statement E: Glomerular Causes (TRUE)
IgA nephropathy and membranoproliferative glomerulonephritis are well-established causes of glomerular hematuria. While not explicitly detailed in the provided guidelines, these represent classic medical renal causes that would be evaluated by nephrology when dysmorphic RBCs, proteinuria, or elevated creatinine are present 2.
Clinical Pitfall
The critical error would be assuming hematuria is primarily a nephrologic problem. In reality, urologic evaluation with cystoscopy is essential because bladder cancer represents the most significant malignant risk, and delays in diagnosis increase cancer-specific mortality by 34% 1. The guidelines specifically warn against the tendency to use imaging alone without cystoscopy, which misses bladder pathology.