How do I convert Sodium (CSF) from mmol/L to mg/dL?

mg/dL = mmol/L × 2.299. In the other direction: mmol/L = mg/dL × 0.435.

Which units are used for Sodium (CSF)?

Common units are mmol/L, g/dL, g/L, mg/dL, mg/L.

Urine & CSF

Sodium (CSF) unit converter

Q: What is the reference range of Sodium (CSF)?

For adults the range is 127.5 – 150.5 mmol/L (Pirke, Wisser, Mertin (1972): Elektrolytkonzentrationen in Liquor und Serum, Z Klin Chem Klin Biochem 10:462-466 (HU Berlin edoc)). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Sodium in cerebrospinal fluid

Also known as: CSF sodium, Liquornatrium, Natrium im Liquor, Sodium in cerebrospinal fluid

Converter

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

mmol/L = mEq/L g/dL g/L mg/dL mg/L

Worked example

139 mmol/L (middle of the reference range) = 0.32 g/dL

Conversion formulas

g/dL	g/dL = mmol/L × 0.002299	mmol/L = g/dL × 435
g/L	g/L = mmol/L × 0.02299	mmol/L = g/L × 43.5
mg/dL	mg/dL = mmol/L × 2.299	mmol/L = mg/dL × 0.435
mg/L	mg/L = mmol/L × 22.99	mmol/L = mg/L × 0.0435

Good to know

Sodium in cerebrospinal fluid is reported in mmol/L or mEq/L, which are numerically identical.

1 mmol/L = 1 mEq/L.
CSF (cerebrospinal fluid) values are only meaningful together with a blood sample taken at the same time and the other CSF results.

Reference range

Unit	Adults
mmol/L = mEq/L	127.5 – 150.5
g/dL	0.2931 – 0.346
g/L	2.931 – 3.46
mg/dL	293.1 – 346
mg/L	2931 – 3460

Source: Pirke, Wisser, Mertin (1972): Elektrolytkonzentrationen in Liquor und Serum, Z Klin Chem Klin Biochem 10:462-466 (HU Berlin edoc) · Last reviewed: 2026-10-19

Note from the source: 127.5-150.5 mmol/L (96th-percentile limits, 102 samples, flame photometry; study from 1972, so methods differ from today's analysers). CSF sodium is held within narrower limits than serum sodium