Ordering Recommendation

Preferred serotonin test when diagnosing carcinoid tumors is Serotonin, Whole Blood (0080395).


Quantitative High Performance Liquid Chromatography


Sun, Tue-Fri


1-5 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation

Abstain from medications for 72 hours prior to collection.


Serum Separator Tube(SST).

Specimen Preparation

Separate from cells within 1 hour of collection. Transfer 0.5 mL serum to an ARUP Standard Transport Tube. (Min: 0.2 mL)

Storage/Transport Temperature

Frozen. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions

Specimens other than serum. Non-frozen specimens.


After separation from cells: Ambient: Unacceptable; Refrigerated: 24 hours; Frozen: 1 month

Reference Interval

50-220 ng/mL

Interpretive Data

Compliance Statement B: For laboratory developed tests not using a RUO kit, and for FDA approved, cleared or 510(k) exempt assays with alterations. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.


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).

Hotline History
CPT Codes


Component Test Code* Component Chart Name LOINC
0080397 Serotonin, Serum 27057-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • 5-HT
  • 5-Hydroxy Tryptamine
  • 5-Hydroxytryptamine
Serotonin, Serum