Biopterin (CSF) unit converter
Total biopterin in CSF (tetrahydrobiopterin metabolism)
Also known as: CSF biopterin, Total biopterin CSF, Biopterin im Liquor
Converter
Enter a value in any unit and all other units fill in.
Worked example
5.95 ng/mL (middle of the reference range) = 25.1 nmol/L
Conversion formulas
| nmol/L | nmol/L = ng/mL × 4.215 | ng/mL = nmol/L × 0.2372 |
|---|---|---|
| µg/dL | µg/dL = ng/mL × 0.1 | ng/mL = µg/dL × 10 |
| ng/dL | ng/dL = ng/mL × 100 | ng/mL = ng/dL × 0.01 |
| ng/L | ng/L = ng/mL × 1000 | ng/mL = ng/L × 0.001 |
Good to know
Total biopterin in cerebrospinal fluid is reported in µg/L (= ng/mL) or in nmol/L.
- nmol/L × 0.237 = ng/mL (exact factor 0.23722); 1 µg/L = 1 ng/mL.
- It is read together with neopterin to find disorders of tetrahydrobiopterin metabolism.
Reference range
| Unit | Adults |
|---|---|
| ng/mL | 2.4 – 9.5 |
| nmol/L | 10.12 – 40.05 |
| µg/dL | 0.24 – 0.95 |
| ng/dL | 240 – 950 |
| ng/L | 2400 – 9500 |
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: 2.4-9.5 µg/L (= ng/mL), about 10-40 nmol/L (reference range of the authors' laboratory); interpreted together with neopterin to detect BH4 deficiencies