A healthy result should fall into the range 5.3 - 46.7 ug/L.

Vitamin B6 is a water-soluble vitamin that is involved in over 100 different enzymatic reactions in the body. Many of these are related to amino acid synthesis, fatty acid metabolism and hemoglobin synthesis. Without enough hemoglobin from a vitamin B6 deficiency, the body’s ability to transport oxygen is decreased and anemia results. 

Vitamin B6 also is critical for the release of glucose from glycogen stores; this is why fatigue is one of the symptoms of a deficiency. The vitamin is also important for the synthesis of serotonin and dopamine. 

The immune system, heart and blood vessels, detoxification (methylation) and cognitive health are dependent on vitamin B6.

A vitamin B6 blood test helps determine whether or not someone is deficient in the vitamin, or has high levels. It can give the doctor clues about anemia, heart disease, lack of energy and skin problems.

Normal Ranges for Vitamin B6 in mcg/L:

Adults:  5-50 mcg/L

Critical Range: <5 or >50 mcg/L



  1. http://www.lifeextension.com/Vitamins-Supplements/itemLC004655/Vitamin-B6-Blood-Test
  2. http://lpi.oregonstate.edu/mic/vitamins/vitamin-B6
  3. https://www.childrensmn.org/references/lab/chemistry/vitamin-b6-assay.pdf 
  4. https://emedicine.medscape.com/article/2088627-overview#a2 

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