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Common Test-Ordering Errors
Part 1: Misordered Tests

1,25-Dihydroxyvitamin D
PTH-related Peptide
Uroporphyrinogen III Synthase


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Sunlight Exposure

Slide 10

April 2010

Sun-exposure is an important variable and explains the lower levels of vitamin D seen in individuals with dark skin, upon which sunlight has decreased effect, in the elderly and other populations confined indoors, and in the seasonal variations that are seen in some areas of the country that have greatly reduced sunlight in the winter months.

Sunlight Exposure


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