Iron & vitamins

Retinol unit converter

Vitamin A (serum retinol)

Also known as: Vitamin A, Vitamine A, Vitamina A

Converter

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

µmol/L µg/dL mg/L µg/L nmol/L

Worked example

2.65 µmol/L (middle of the reference range) = 75.9 µg/dL

Conversion formulas

µg/dL	µg/dL = µmol/L × 28.65	µmol/L = µg/dL × 0.0349
mg/L	mg/L = µmol/L × 0.2864	µmol/L = mg/L × 3.491
µg/L	µg/L = µmol/L × 286.4	µmol/L = µg/L × 0.003491
nmol/L	nmol/L = µmol/L × 1000	µmol/L = nmol/L × 0.001

Reference range

Unit	Adults
µmol/L	1.1 – 4.2
µg/dL	31.52 – 120.3
mg/L	0.3151 – 1.203
µg/L	315.1 – 1203
nmol/L	1100 – 4200

Source: MedlinePlus (NLM): Vitamin A blood test · Last reviewed: 2026-10-14

Note from the source: 30-120 µg/dL (1.1-4.2 µmol/L) (MedlinePlus)

Frequently asked questions

How do I convert Retinol from µmol/L to µg/dL?

µg/dL = µmol/L × 28.65. In the other direction: µmol/L = µg/dL × 0.0349.

What is the reference range of Retinol?

For adults the range is 1.1 – 4.2 µmol/L (MedlinePlus (NLM): Vitamin A blood test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Retinol?

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