3-O-Methyldopa (CSF) unit converter
L-dopa metabolite in CSF (AADC deficiency, L-dopa therapy)
Also known as: 3-OMD CSF, 3-methoxytyrosine CSF, 3-OMD (Liquor)
Converter
Enter a value in any unit and all other units fill in.
Worked example
25 nmol/L (middle of the reference range) = 5.28 ng/mL
Conversion formulas
| ng/mL | ng/mL = nmol/L × 0.2112 | nmol/L = ng/mL × 4.734 |
|---|---|---|
| µg/dL | µg/dL = nmol/L × 0.02112 | nmol/L = µg/dL × 47.35 |
| ng/dL | ng/dL = nmol/L × 21.12 | nmol/L = ng/dL × 0.04735 |
Good to know
3-O-methyldopa (3-OMD) in cerebrospinal fluid is reported in nmol/L or in ng/mL.
- ng/mL × 4.73 = nmol/L (exact factor 4.734).
- It is raised when L-dopa is given or when the enzyme AADC is missing, so the result is read together with HVA and 5-HIAA.
Reference range
| Unit | Adults |
|---|---|
| ng/mL | 0 – 10.56 |
| nmol/L | 0 – 50 |
| µg/dL | 0 – 1.056 |
| ng/dL | 0 – 1056 |
Source: Cerebrospinal fluid neurotransmitters, pterins, folates and amino acids in paediatric-onset epilepsies, Children 2025 (age-related reference ranges of the authors' laboratory, PMC) · Last reviewed: 2026-10-19
Note from the source: Children from 6 months and adults 0-50 nmol/L (age-related ranges of the authors' laboratory; infants up to 300 nmol/L). Raised in aromatic L-amino acid decarboxylase deficiency and during L-dopa treatment. 1 ng/mL = 4.73 nmol/L