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Get valuable insights from all Quest reference testing as well as 40+ medical laboratory guidelines, sourced by clinical societies. The Joint Directory of Services (JDOS) offering is a …

Vitamin D, 25-Hydroxy, Total, Immunoassay - Measurement of serum 25-OH vitamin D concentrations provide a good index of circulating vitamin D activity in patients not suffering …

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Quest offers two methods of vitamin D [25(OH)D] testing that can help you regularly assess at-risk patients, identify vitamin D deficiency and disorders, and manage deficiency once diagnosed.

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Vitamin D levels <20 ng/mL are considered vitamin D deficient. Vitamin D deficiency may lead to elevated parathyroid hormone (PTH) levels (secondary hyperparathyroidism). If your patients' …