Vitamin Deficiency Tests

Vitamin D promotes bone health by increasing absorption of calcium and phosphorus in the intestine. It also plays a role in neuromuscular, immune, and other cellular functions. Although exposure to sunlight is a ready source of vitamin D, deficiency in the U.S. is common.

Sufficiency vs Insufficiency vs Deficiency

25-Hydroxyvitamin D [25(OH)D] measurements are used to find out if people have enough vitamin D. Here’s a good guide :

Sufficiency: 30–100 ng/mL

• Insufficiency: 21–29 ng/mL

• Deficiency: <20 ng/mL

These conditions may put people at risk for vitamin D deficiency:

• Being pregnant

• Lactating

• Having dark skin

• Being elderly

• Being obese

• Being housebound

• Taking certain medications

• Having a malabsorption syndrome - Left undiagnosed for years can lead to frequent fracturing of bones disrupting a child's life and causing unnecessary pain and suffering.

References 1. U.S. Department of Health and Human Services. Overweight and obesity statistics. Accessed July 17, 2015. 2. Wortsman J, Matsuoka LY, Chen TC, et al. Decreased bioavailability of vitamin D in obesity. Am J Clin Nutr. 2000;72:690-693.

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