Epithelial Cells 8-10/HPF on Urine Microscopy: Clinical Significance
The finding of 8-10 epithelial cells per high-power field on routine urine microscopy most commonly indicates specimen contamination from periurethral or vaginal sources and does not require specific treatment, but it significantly reduces the reliability of other urinalysis findings, particularly for detecting microscopic hematuria or urinary tract infection.
Understanding the Finding
Epithelial cells in urine are typically squamous epithelial cells (SECs) shed from the distal urethra, vagina, or perineal skin during specimen collection. The presence of 8-10 cells/HPF falls into a moderate range that suggests suboptimal collection technique rather than a pathologic process.
Key Clinical Context
- Specimen Quality Indicator: High SEC counts primarily reflect collection technique rather than disease 1
- Contamination Threshold: Research demonstrates that specimens with >2 SECs/HPF have significantly reduced positive predictive value for detecting true microscopic hematuria (dropping from 68.8% to 46.1%) 2
- Impact on Test Performance: Urinalysis samples with >8 SECs/lpf show reduced diagnostic accuracy (sensitivity 86%, specificity 70%) compared to samples with <8 SECs/lpf (sensitivity 75%, specificity 84%) 3
Clinical Implications
For Hematuria Evaluation
If this urinalysis was performed to evaluate for microscopic hematuria, the specimen should be considered inadequately collected and requires repeat testing 2. The 2025 AUA/SUFU guidelines emphasize that initial determination of microscopic hematuria should be based on microscopic examination of urinary sediment from a freshly voided, clean-catch, midstream urine specimen 4.
- Any finding of ≥3 RBCs/HPF in a specimen with 8-10 epithelial cells should be confirmed with a properly collected specimen before proceeding with hematuria evaluation
- For women with persistent contamination despite proper collection technique, catheterized specimen collection should be considered to obtain accurate results 2
For UTI Evaluation
A urine sample with >10 WBCs and a significant number of epithelial cells must be considered contaminated, and either an improved clean-catch method or catheterization should be attempted 1. While the guideline specifically mentions >10 epithelial cells, your finding of 8-10 cells falls into a gray zone where clinical judgment is needed.
Recommended Action
Repeat the urinalysis using proper midstream clean-catch technique:
- Patient education on collection: Cleanse periurethral area, begin voiding into toilet, then collect midstream portion
- Process specimen promptly: Keep at 0-4°C and process within 8 hours 5
- If repeat specimen shows similar contamination: Consider catheterized specimen, particularly in women being evaluated for hematuria 2
Important Caveats
- Do not pursue hematuria workup based on RBC counts from contaminated specimens
- Do not treat for UTI based on pyuria or bacteriuria from contaminated specimens without confirmation
- The finding itself requires no treatment—it simply indicates the need for specimen recollection
What NOT to Do
- Do not proceed with cystoscopy or imaging for hematuria evaluation based on this specimen 4
- Do not initiate antibiotics for suspected UTI without proper specimen confirmation 1
- Do not ignore the finding if other urinalysis abnormalities are present—the contamination invalidates those results 3
The clinical significance is primarily that this specimen is unreliable for diagnostic purposes and proper recollection is necessary before making any clinical decisions based on urinalysis findings.