Squamous epithelial cells are not normally seen in urine samples obtained by:

Squamous epithelial cells are not normally seen in urine samples obtained by:

• A. Catheterization
• B. Manual expression
• C. Free catch
• D. Cystocentesis

Answer: (D)

Squamous epithelial cells come from the lining of the distal urethra and external genital tract, so their presence in urine usually indicates contamination from these mucosal surfaces rather than true urine from the bladder. When urine is collected by methods that pass through or contact the urethra and genital tract—such as free catch or manual expression—the sample can pick up squamous cells from those mucosal linings. Catheterization also involves the urethra, so some contamination can occur, though typically less than with free catch. Cystocentesis, on the other hand, obtains urine directly from the bladder through the abdominal wall, bypassing the urethra and genital tract, so the sample is much less likely to contain squamous cells. Therefore, squamous epithelial cells are not normally seen in urine collected by cystocentesis.

Squamous epithelial cells come from the lining of the distal urethra and external genital tract, so their presence in urine usually indicates contamination from these mucosal surfaces rather than true urine from the bladder. When urine is collected by methods that pass through or contact the urethra and genital tract—such as free catch or manual expression—the sample can pick up squamous cells from those mucosal linings. Catheterization also involves the urethra, so some contamination can occur, though typically less than with free catch. Cystocentesis, on the other hand, obtains urine directly from the bladder through the abdominal wall, bypassing the urethra and genital tract, so the sample is much less likely to contain squamous cells. Therefore, squamous epithelial cells are not normally seen in urine collected by cystocentesis.