Recovery of protein from urine specimens collected in cotton wool.

Smith, G C; Taylor, C M · Arch Dis Child · 1992

Level V

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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.

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