Screening for Microscopic Hematuria in a Urogynecologic Population

Area of Science:

• Urology
• Clinical Chemistry
• Medical Diagnostics

Background:

• Microhematuria, defined as the presence of red blood cells (RBCs) in urine, is a key indicator for various renal and urinary tract conditions.
• Urine dipstick tests are commonly used for initial screening, but their correlation with microscopic findings can be influenced by several factors.
• Accurate detection of microhematuria is crucial for timely diagnosis and management of underlying pathologies.

Purpose of the Study:

• To determine the correlation between a urine dipstick finding of blood and microscopic confirmation of at least 3 red blood cells per high-power field (RBCs/HPF).
• To identify clinical factors that may influence the accuracy of this correlation in women.

Main Methods:

• Retrospective review of urine dipstick and microscopy results from women with positive blood tests between August 2012 and August 2013.
• Categorization of patients based on microscopy findings (≥3 RBCs/HPF vs. <3 RBCs/HPF).
• Analysis of clinical and demographic variables using SAS version 9.4.

Main Results:

• Of 203 women analyzed, 25.6% had ≥3 RBCs/HPF on microscopy.
• A dipstick finding of moderate or large blood was significantly associated with ≥3 RBCs/HPF (P < 0.001).
• Increasing age, recurrent urinary tract infections, and urinary specific gravity >1.010 were associated with higher RBC counts.

Conclusions:

• Lower urinary specific gravity may lead to underestimation of microhematuria.
• Urine dipstick results indicating moderate or large blood enhance the probability of microscopic confirmation of microhematuria.
• Current guidelines for microhematuria detection and evaluation may require refinement due to clinical and economic implications.