Preferred serotonin test when diagnosing carcinoid tumors is Serotonin, Whole Blood (0080395).
Quantitative High Performance Liquid Chromatography
Abstain from medications for 72 hours prior to collection.
Serum Separator Tube(SST).
Separate from cells within 1 hour of collection. Transfer 0.5 mL serum to an ARUP Standard Transport Tube. (Min: 0.2 mL)
Frozen. Separate specimens must be submitted when multiple tests are ordered.
Specimens other than serum. Non-frozen specimens.
After separation from cells: Ambient: Unacceptable; Refrigerated: 24 hours; Frozen: 1 month
Laboratory Developed Test (LDT)
Medications that may affect serotonin concentrations include lithium, MAO inhibitors, methyldopa, morphine, and reserpine. In general, foods that contain serotonin do not interfere significantly. Slight increases may be seen in acute intestinal obstruction, acute MI, cystic fibrosis, dumping syndromes, and nontropical sprue. Metastasizing abdominal carcinoid tumors often show serotonin concentrations greater than 400 ng/mL.
In general, EDTA whole blood (as compared to serum) preserved with ascorbic acid will give values most representative of blood concentrations. Most (95 percent) of blood serotonin is found in platelets. Refer to Serotonin, Whole Blood (ARUP test code 0080395).
|Component Test Code*||Component Chart Name||LOINC|
- 5-Hydroxy Tryptamine