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How do you use a vitamin D level chart?

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Quick Answer

A vitamin D level chart indicates the acceptable and unacceptable levels of the vitamin per unit volume of blood. It is used by comparing the results of a blood test for vitamin D to the documented reference values, according to medical awareness non-profit organization, the Vitamin D Council.

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Full Answer

A typical vitamin D chart displays reference values of vitamin D in nanograms per milliliter (ng/ml) of blood and indicates normalcy, deficiency, insufficiency, excess and toxicity levels, according to the U.S. National Library of Medicine. Several organizations such as the Food and Nutrition Board (FNB) at the Institute of Medicine of The National Academies, the Institute of Medicine, and the Vitamin D Council recommend various levels of vitamin D as the normal reference value, the Vitamin D Council reports. Consequently, these charts also show a small variation in the Recommended Dietary Allowance — the daily intake required for a healthy person.

Standard vitamin D charts use 50-54 ng/mal as the normal reference value for vitamin D in healthy adults, according to the National Institutes of Health. Twenty to 32 ng/ml is an indicator of vitamin D insufficiency, while values below 20 ng/ml are indicators of severe deficiency. Values above 100 ng/ml are indicators of excess vitamin D, while any reading greater than 150 ng/ml are toxic to the human body.

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