Vitamin B3, Niacin

Tube Type = Lavender Top

Tube Type

Test ID LAB1109
EPIC Order
 NIACIN (VITAMIN B3)
CPT Code(s) 84591
Group/Individual Test Individual
Laboratory Core Referral Testing
Tube Station 30
Specimen Routine: 3 mL blood/lavender EDTA tube; See Comments
Micro: 2.5 mL blood
Availability Routine: Reference Laboratory - Mayo Clinic Laboratories
Turnaround Time 3-10 days
Reference Range Normal: See separate report
Comments
Draw a separate tube when collecting other vitamins.
Sample must be processed within 2 hours of collection.

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Reviewed by J. Carr on December 18, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514