Questions: QUESTION 14 While processing a urine specimen, the technologist notes yellow foam that does not dissipate upon standing. He suspects the presence of: bilirubin. protein and bilirubin. urochrome and protein. biliverdin and urochrome.

The answer is the first one: bilirubin.

Explanation for each option:

1. Bilirubin: The presence of yellow foam that does not dissipate upon standing is a classic indication of bilirubin in the urine. Bilirubin is a yellow compound that can cause the urine to foam when shaken, and this foam remains stable.

2. Protein and bilirubin: While protein in the urine can cause foaming, it typically results in white foam rather than yellow. The yellow foam specifically points to bilirubin.

3. Urochrome and protein: Urochrome is the pigment that gives urine its typical yellow color, but it does not cause foaming. Protein can cause foaming, but as mentioned, it would be white foam, not yellow.

4. Biliverdin and urochrome: Biliverdin is a green bile pigment, and its presence would not cause yellow foam. Urochrome, as stated, does not cause foaming.

Summary: The presence of yellow foam that does not dissipate upon standing is indicative of bilirubin in the urine.