Drugs & toxicology

Quetiapine unit converter

Atypical antipsychotic drug level for therapeutic drug monitoring

Also known as: Seroquel

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

300 ng/mL (middle of the reference range) = 782 nmol/L

Conversion formulas

nmol/L	nmol/L = ng/mL × 2.607	ng/mL = nmol/L × 0.3835
mg/L	mg/L = ng/mL × 0.001	ng/mL = mg/L × 1000
µmol/L	µmol/L = ng/mL × 0.002607	ng/mL = µmol/L × 383.5
µg/dL	µg/dL = ng/mL × 0.1	ng/mL = µg/dL × 10

Reference range

Unit	Adults
ng/mL	100 – 500
nmol/L	260.7 – 1304
mg/L	0.1 – 0.5
µmol/L	0.2607 – 1.304
µg/dL	10 – 50

Source: Therapeutic Drug Monitoring in Psychiatry (Pharmaceuticals 2024), AGNP reference ranges · Last reviewed: 2026-10-14

Note from the source: AGNP consensus reference range 100-500 ng/mL (trough)

Frequently asked questions

How do I convert Quetiapine from ng/mL to nmol/L?

nmol/L = ng/mL × 2.607. In the other direction: ng/mL = nmol/L × 0.3835.

What is the reference range of Quetiapine?

For adults the range is 100 – 500 ng/mL (Therapeutic Drug Monitoring in Psychiatry (Pharmaceuticals 2024), AGNP reference ranges). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Quetiapine?

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