Vitamin B12 Unit Converter

How this is worked out

This tool is for general wellbeing information and is not a diagnosis or medical advice. It places the numbers you enter in context; it cannot tell you whether you have a condition. If a result concerns you, or you have symptoms, speak to your GP.

Read more

• Vitamin b12 blood test
• Vitamin deficiency blood test
• Folate blood test

Questions

How do you convert vitamin B12 from pmol/L to ng/L?

Divide the pmol/L figure by 0.7378. So 148 pmol/L is about 201 ng/L, 300 pmol/L is about 407 ng/L, and 500 pmol/L is about 678 ng/L.

How do you convert vitamin B12 from ng/L to pmol/L?

Multiply the ng/L figure by 0.7378. So 200 ng/L is about 148 pmol/L, 400 ng/L is about 295 pmol/L, and 1000 ng/L is about 738 pmol/L.

Is ng/L the same as pg/mL for B12?

Yes. ng/L and pg/mL are numerically identical, so a B12 of 400 ng/L is the same as 400 pg/mL. Only pmol/L uses a different scale.

What about pmol/L to ng/mL?

B12 is almost never reported in ng/mL, because the numbers would be tiny. One ng/mL is 1000 ng/L, so 300 pmol/L works out at about 0.407 ng/mL. If a chart shows B12 values in the hundreds, it is using ng/L or pg/mL, not ng/mL.

Does this tell me if my B12 is low?

No. This converter only changes the unit; it is not a diagnosis. Whether a B12 level is adequate depends on the reference range on your report, your symptoms and sometimes further tests, which are for a qualified clinician to interpret.