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)
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 mcg/mL
Toxic: >500 ng/mL
Toxic: >500 ng/mL
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
No