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Item Value
Approval req'd? No
Available Stat? No
Test code CARO
Performed by Quest
Sendout? Yes
Method HPLC
Patient Preparation An 8 hour fast before specimen collection is preferred
Collection Instructions Wrap tube in Aluminum foil to protect from light.
Container type Gold top
Amount to Collect 2 mL blood
Sample type Serum
Preferred volume 1 mL serum
Min. Volume 0.5 mL serum
Processing notes Separate serum as soon as possible after clotting. Wrap tube in Aluminum foil to protect from light and refrigerate. Order Quest # 20537P.
Units µg/dL (mcg/dL)
Normal range
PEDIATRIC 9 mo-6 years < 48 µg/dL 7-17 years < 95 µg/dL

≥ 18 year old Males 4-51 µg/dL Females 6-77 µg/dL
Turn around times Test run Monday-Friday. Turnaround time: 2-6 days.
Additional information This test was developed and its performance characteristics determined by Quest Nichols Laboratories. It has not been cleared or approved by the U.S. Food and Drug Administration.
CPT coding 82380-90
LOINC code 2053-7
Last Updated 6/21/2016 08:09:05
Entry Number 171
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