A urine sample showing white foam on shaking implies increased concentration of which component?

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Study for Success in Clinical Laboratory Science - Urinalysis and Body Fluids Test. Prepare with flashcards and multiple-choice questions, with hints and explanations. Get ready for your exam!

Multiple Choice

A urine sample showing white foam on shaking implies increased concentration of which component?

Explanation:
Foamy urine when shaken reflects protein in the urine. Proteins, especially albumin, act as surface-active agents and lower the surface tension at the air–urine interface, stabilizing air bubbles and creating persistent white foam. The more protein present, the more noticeable the foam. This is not due to hemoglobin, bilirubin, or nitrite, which would cause different indicators or color changes rather than a frothy, foamy appearance.

Foamy urine when shaken reflects protein in the urine. Proteins, especially albumin, act as surface-active agents and lower the surface tension at the air–urine interface, stabilizing air bubbles and creating persistent white foam. The more protein present, the more noticeable the foam. This is not due to hemoglobin, bilirubin, or nitrite, which would cause different indicators or color changes rather than a frothy, foamy appearance.

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