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Neurology & psychiatry

5-Hydroxytryptophan (CSF): convert ng/mL to nmol/L

nmol/L = ng/mL × 4.541

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

Conversion formulas

ng/mL → nmol/Lnmol/L = ng/mL × 4.541
nmol/L → ng/mLng/mL = nmol/L × 0.2202

Conversion table

Highlighted: values inside the adult reference range.

ng/mLnmol/L
0.52.271
14.541
1.56.812
29.082
2.511.35
313.62
3.515.89
418.16
4.520.43
522.71
5.524.98

Reference range

0 – 2.202 ng/mL = 0 – 10 nmol/L

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

Frequently asked questions

How do I convert 5-Hydroxytryptophan (CSF) from ng/mL to nmol/L?

nmol/L = ng/mL × 4.541. For example, 1 ng/mL equals 4.54 nmol/L.

How many nmol/L are 1 ng/mL?

1 ng/mL equal 4.54 nmol/L (5-Hydroxytryptophan (CSF)).

How do I convert 5-Hydroxytryptophan (CSF) from nmol/L back to ng/mL?

ng/mL = nmol/L × 0.2202.

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