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Iron and vitamins
Active B12
Measures the active form of vitamin B12 in the blood.
What it measures
It measures the amount of active vitamin B12 that is usable by cells.
Why it is tested
It is commonly used to help assess vitamin B12 status in more detail.
Low results
Low results may be associated with vitamin B12 deficiency or low absorption.
High results
High results may occur with supplements or certain conditions.
Related tests
Vitamin B12, Folate, MCV
Sources
Other markers
Disclaimer
This information is for education only and is not a substitute for medical advice. Results should be interpreted by a qualified clinician alongside your symptoms and medical history.