Discussion
Serum Vitamin D level ______ are indicative of sub-clinical Vitamin D deficiency.
Answer: A
Serum vitamin D levels below 20 ng/dl, the keyed value, are taken to indicate sub-clinical vitamin D deficiency.
Sub-clinical deficiency is the stage at which the biochemical level is low although there are no visible signs yet, so the cut-off is a laboratory threshold. The keyed value is 20, and the options of 10 and 5 describe lower and more severe levels, while 30 is a higher threshold that is usually taken as the lower limit of the sufficient range, not the line for deficiency.
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