Which of the following substances is likely to be elevated in urine of a carcinoid syndrome patient? (LQ)
|A||5-hydroxyindoleacetic acid (5-HIAA)|
|B||Aminolevulinic acid (ALA)|
a. The patient has carcinoid syndrome, which include flushing, diarrhea, and bronchoconstriction.
b. The syndrome results from elaboration of serotonin (5-hydroxytryptamine) by a primary carcinoid tumor in the lungs or ovary or from hepatic metastases from a primary carcinoid tumor in the gastrointestinal tract.