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What vitamin D level indicates a deficiency?
< 20 ng/mL
< 30 ng/mL
< 40 ng/mL
< 50 ng/mL
The correct answer is: < 30 ng/mL
Vitamin D deficiency is commonly defined as a serum 25-hydroxyvitamin D level below 30 ng/mL. This level indicates a lack of sufficient vitamin D in the body, which can lead to various health issues such as weakened bones, muscle pain, and increased risk of fractures. Therefore, option B (< 30 ng/mL) is the correct answer. Options A, C, and D are not indicative of a deficiency as they are above the commonly accepted threshold for defining a vitamin D deficiency.