Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
Too much B6 from supplements can cause numbness.
Why it's done
- Numbness or tingling
- Some medicines, alcohol use, or kidney disease
- Taking high-dose supplements
Getting ready and what happens
- Fast overnight if asked; stop B6 supplements beforehand only if told to.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
Low
Supplements and diet changes help.
High
Usually from supplements; stopping them often improves symptoms.
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related tests
Sources
Last updated 2026-11-13.