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NOTE: Multiple lab options. Use our Lab Locator to find closest.

Serotonin, Serum

Laboratory: LabCorp
Laboratory: Quest Diagnostics

This test may be used when an individual is presenting signs or symptoms of a carcinoid tumor. Such symptoms would be:

  • rapid heart rate
  • vomiting/ nausea
  • diarrhea
  • difficulty breathing or wheezing 
  • flushing of the face and neck

Any individual taking an MAO Inhibitor medication should speak with their physician or healthcare provider before discontinuing use.

1. Purchase Tests

Choose the test you want (be sure to pick the laboratory you want to use).

Pay by credit card or PayPal®.

You pay directly and we do not bill your insurance.

(Note: A $10 laboratory fee is added to your total when you purchase one or more blood tests.)

2. Visit a Lab

After purchasing your testing you will receive an email with your lab requisition.  Bring this form to the laboratory.

NOTE: Be sure to visit the appropriate laboratory! 

If you choose LabCorp only visit a Labcorp location. 
If you choose Quest Diagnostics only visit a Quest location!

Find Your Lab Location.

No appointment is needed, but making one can minimize your wait time. 

If you have selected the option to have an At Home Test Kit delivered to you, you will receive your test kit in the mail within 5 to 7 business days. (Not all tests are available as At Home Test Kits.)

3. Get Results

We’ll email you when your results are ready. Sign into your account to view and download your result reports.

Sample Type
Prepare For Your Test
Monoamine oxidase inhibitor (MAO Inhibitor) drugs should be discontinued for at least one week prior to sampling since they tend to increase the level of serotonin.
Also Known As
No other names specified