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Detection of nutritional deficiency as in anorexia nervosa or of excess of carotene as with food faddists; evidence of person with lipid malabsorption.
70 - 300 mcg/dl
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect blood in a red top or SST tube from a fasting patient (12 hour fast). Patient should not consume any alcohol for 24 hours prior to collection of specimen. Centrifuge, aliquot serum into plastic vial and freeze within 1 hour of collection. Protect specimen from light.