Methodology
High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS)
Specimen Type
Serum or Plasma
Performing Lab
NMS Labs
Epic ID
Other Reference Test
Standard TAT
3-6 Days
Collection Information
Specimen Required
1-4 mL Blood
Container Type
Red Top (No Additive)
Collection Instructions
Plasma collected in a sodium heparin (green-top) tube is also acceptable. It is recommended that patients refrain from taking excessive amounts of vitamin C or vitamin C rich food for at least 48 hours prior to collection. Ascorbic acid at very high concentration (exceeding 51 mcmol/mL plasma) can interfere.
Processing Information - Lab Use Only
Transport Temperature
Frozen-Only
Specimen Stability
Room Temp: Not Stable; Refrigerated: Not Stable; Frozen: 30 Days
Rejection Criteria
Received Room Temperature. Received Refrigerated. Gray top tube (Sodium Fluoride / Potassium Oxalate). Polymer gel separation tube (SST or PST).
Test Volume Required
2 mL Serum or Plasma
Minimum Test Volume
0.4 mL Serum or Plasma
Processing Instructions
Promptly centrifuge with refrigeration and separate serum or plasma into chilled transport tube. Freeze immediately and send frozen.
CPT Codes
83945
Revised
6/10/26
Initials
IM