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Recovery of protein from urine specimens collected in cotton wool
1Children's Hospital, Birmingham, Ladywood.
Archives of Disease in Childhood
|December 1, 1992
Insights
Cotton wool balls interfere with infant urine tests. Protein levels, like albumin and retinol binding protein, significantly decrease when using cotton wool, affecting diagnostic accuracy for proteinuria.
Area of Science:
- Clinical Chemistry
- Pediatric Diagnostics
- Biochemical Analysis
Background:
- Infant urine collection often utilizes cotton wool balls.
- Accurate measurement of urinary proteins is crucial for diagnosing kidney conditions in infants.
Purpose of the Study:
- To evaluate the impact of cotton wool balls on the concentration of urinary proteins in infant samples.
- To determine the suitability of cotton wool balls for urine collection in proteinuria investigations.
Main Methods:
- Urine samples from infants were collected.
- The effect of cotton wool ball contact on albumin and retinol binding protein concentrations was measured over time.
Main Results:
- Albumin concentration decreased by 40% within 15 minutes of contact with cotton wool.
- Retinol binding protein concentration decreased by 80% within 15 minutes of contact with cotton wool.
Conclusions:
- Cotton wool balls significantly reduce measured concentrations of key urinary proteins.
- The use of cotton wool balls is not recommended for infant urine sample collection when assessing proteinuria.
Abstract:
Cotton wool balls have been used to aid the collection of urine from infants. Concentrations of two urinary proteins, albumin and retinol binding protein, decreased by 40 and 80% respectively within 15 minutes of contact with the cotton wool. Cotton wool balls should not be used when investigating proteinuria.