Centralized Core Laboratory:Chemistry
Red top (no anticoagulant) tube
1.25 mL (minimum 0.7 mL)
Sent to reference lab
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Patient preparation: 12- 14 hour fast prior to collection.
Separate serum from cells immediately. Protect specimen from light.
(Infants-draw prior to next feeding).
0-6 years: 11.3-64.7 mcg/dL
7-12 years: 12.8-81.2 mcg/dL
13-17 years: 14.4-97.7 mcg/dL
>or= 18 years: 32.5-78.0 mcg/dL