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Cholecalciferol, vitamin D 1,25-dihydroxy.
To assess vitamin D levels toward diagnosing disorders such as vitamin toxicity, malabsorption, and vitamin deficiency.
Serum collected in a red-top tube. Plasma collected in a green-top (heparin) tube is also acceptable.
(Method: High-performance liquid chromatography)
|Form||Conventional Units||SI Units (Conventional Units × 2.496)|
|Vitamin D 25-hydroxy|
|Deficient||Less than 20 ng/mL||Less than 49.9 nmol/L|
|Insufficient||20–30 ng/mL||49.9–74.9 nmol/L|
|Optimal||30–100 ng/mL||74.9–249.6 nmol/L|
|Possible Toxicity||Greater than 150 ng/mL||Greater than 374.4 nmol/L|
|Conventional Units||SI Units (Conventional Units × 2.6)|
|Vitamin D 1,25-dihydroxy||18–72 pg/mL||47–187 pmol/L|