General Information

UPHSM LIS Test #: 626
Testing Time:
Testing Lab: Labcorp

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 1.5(1.0) mL
Temperature: Frozen
Tube Type: Lavender-Top Whole Blood, Light Protected
Collection Info:
Specimen:  Whole blood, frozen and protected from light

Volume:  1.5 mL

Minimum Volume:  1 mL

Container:  Lavender-top (EDTA) tube. Use amber plastic transport tube with amber stopper. (If amber tubes are unavailable, cover standard transport tube completely, top and bottom, with aluminum foil. Identify specimen with patient's name directly on the container and the outside of the aluminum foil. Secure with tape. )

Collection:  Draw blood. Do not separate. Protect specimen from light. Collect sample before breakfast in the morning prior to any medications.
Storage Instructions:  Transfer whole blood to a plastic transport tube and freeze. Protect from light. Samples are only stable for one day at 2°C to 8°C.

Causes for Rejection:  Specimen not frozen; plasma specimen; use of anticoagulants other than EDTA; specimen not protected from light; plasma or serum specimen


High-pressure liquid chromatography (HPLC) with fluorescence detector
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

CPT Codes


* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Reference Range

137-370 µg/L. Note: Reference interval reflects flavinadeninedinucleotide (FAD), that accounts for approximately 90% of the total riboflavin in whole blood.