Test Details
Mnemonic
NORTI
Ordering Code
1750325
CPT-4 Code(s)
80335 (G0480)
Specimen Information
Collect
Red top
Specimen Preparation
Centrifuge, separate serum from cells within 2 hours and send 1.0 mL serum in a screw capped plastic vial.
Alternate Specimen
Lavender EDTA, gray sodium fluoride, potassium oxalate
Minimum Volume
0.2 mL
Transport Temperature
Refrigerated
Rejection Criteria
Serum separator tube (SST), grossly lipemic, hemolyzed, and icteric specimens.
Stability
Room temperature: 48 hours
Refrigerated: 14 days
Frozen: 14 days
Refrigerated: 14 days
Frozen: 14 days
Methodology
High Performance Liquid Chromatography
Reference Range
Therapeutic range: 10 - 35 ng/mL
Toxic: >500 ng/mL
Toxic: >500 ng/mL
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
No