Significance of Squamous Epithelial Cells in Urine

Origin and Normal Presence

Squamous epithelial cells in urine typically originate from the urethra, trigone area of the bladder, or contamination from the cervicovaginal region during collection 1, 2

A urine sample with >10 WBCs and a significant number of epithelial cells should be considered potentially contaminated 3

Collection method significantly affects contamination rates: clean-catch (27%), bag specimens (65-68%), and catheterized specimens (4.7%) 4
Proper cleansing of the perineal area before collection can reduce contamination rates (7.8% with cleansing vs. 23.9% without) 4
Catheterization provides more reliable specimens with higher sensitivity (95%) and specificity (99%) 3, 4

When significant squamous epithelial cells are present alongside mixed bacterial flora, consider recollection using a more reliable method if clinical suspicion for UTI remains high 4
For proper interpretation of urine cultures with mixed flora and squamous cells, consider collection method, patient symptoms, and presence of pyuria 4
In children with fever and suspected UTI, a positive culture with mixed flora and squamous cells should be confirmed by catheterization or suprapubic aspiration before treatment 4