Neurology & psychiatry

Serotonin (whole blood) unit converter

Platelet-stored monoamine; used mainly to evaluate carcinoid tumors

Also known as: 5-HT, 5-hydroxytryptamine

Converter

Enter a value in any unit and all other units fill in.

ng/mL nmol/L mg/L µmol/L µg/dL

Worked example

115 ng/mL (middle of the reference range) = 653 nmol/L

Conversion formulas

nmol/L	nmol/L = ng/mL × 5.675	ng/mL = nmol/L × 0.1762
mg/L	mg/L = ng/mL × 0.001	ng/mL = mg/L × 1000
µmol/L	µmol/L = ng/mL × 0.005675	ng/mL = µmol/L × 176.2
µg/dL	µg/dL = ng/mL × 0.1	ng/mL = µg/dL × 10

Reference range

Unit	Adults
ng/mL	0 – 230
nmol/L	0 – 1305
mg/L	0 – 0.23
µmol/L	0 – 1.305
µg/dL	0 – 23

Source: MedlinePlus (NLM): Serotonin blood test · Last reviewed: 2026-10-14

Note from the source: 0-230 ng/mL (0-1.3 µmol/L) (MedlinePlus)

Frequently asked questions

How do I convert Serotonin (whole blood) from ng/mL to nmol/L?

nmol/L = ng/mL × 5.675. In the other direction: ng/mL = nmol/L × 0.1762.

What is the reference range of Serotonin (whole blood)?

For adults the range is 0 – 230 ng/mL (MedlinePlus (NLM): Serotonin blood test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Serotonin (whole blood)?

Common units are ng/mL, nmol/L, mg/L, µmol/L, µg/dL.