5-Hydroxytryptamine
10 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Accredited Laboratory Partner
Contact Technical Support
Used in diagnosing carcinoid tumors and serotonin-producing tumors.
Whole Blood
10 mL EDTA/ascorbic acid mixture
Lavender-top (EDTA) tube and transport tube (LabCorp N° 33314) containing 75 mg ascorbic acid
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Sample collection practices that prevent blood clotting and oxidation of serotonin are imperative. Collect three tubes (4 mL each) whole blood. Invert tubes at least ten times to ensure thorough distribution of EDTA. Immediately transfer 10 mL whole blood to transport tube containing 75 mg ascorbic acid. Thoroughly mix by inverting whole blood/ascorbic acid mixture another ten times. Freeze transport tube and send entire collection to the laboratory. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
| Temperature | Period |
|---|---|
| Room temperature | 4 hours |
| Refrigerated | 1 day |
| Frozen | 16 days |
5-Hydroxytryptamine
10 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Accredited Laboratory Partner
Contact Technical Support
Used in diagnosing carcinoid tumors and serotonin-producing tumors.
Whole Blood
10 mL EDTA/ascorbic acid mixture
Lavender-top (EDTA) tube and transport tube (LabCorp N° 33314) containing 75 mg ascorbic acid
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Sample collection practices that prevent blood clotting and oxidation of serotonin are imperative. Collect three tubes (4 mL each) whole blood. Invert tubes at least ten times to ensure thorough distribution of EDTA. Immediately transfer 10 mL whole blood to transport tube containing 75 mg ascorbic acid. Thoroughly mix by inverting whole blood/ascorbic acid mixture another ten times. Freeze transport tube and send entire collection to the laboratory. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
| Temperature | Period |
|---|---|
| Room temperature | 4 hours |
| Refrigerated | 1 day |
| Frozen | 16 days |