THC Metabolite, Serum/Plasma Quant

Test Code: TD_5948
CPT Code(s): 80349

$99

Test Details

Alternative Name(s)

11-nor-9-carboxy-thc, quant
Cannabinoids, quantitative
Quantitative thc
Tetrahydrocannabinol

Test Includes

THC Metabolite, Serum/Plasma Quant

Methodology

Liquid chromatography-tandem mass spectrometry (LC-MS/MS)

Rejection Criteria

Samples collected in serum separator tube
Avoid repeated freeze/thaw cycles
Citrated plasma

Reference Range(s)

Positive Cutoff for 11-NOR-9-CARBOXY-THC: 5 NG/ML

Specimen Requirements

Preferred Specimen

Sodium fluoride/potassium oxalate (gray top) tube

Minimum Volume

0.5 mL plasma or serum

Sample Stability

After separation from cells:
1 week room temperature
2 weeks refrigerated
3 years frozen

Transport Temperature

Refrigerated

Collection Instructions

1 mL sodium fluoride/potassium oxalate plasma. Centrifuge sample and separate plasma from cells within 2 hours of collection. Transfer plasma to a plastic transport tube. Refrigerate.

Alternative Specimen

1 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Refrigerate.

1 mL EDTA (lavender top) or sodium heparin (green top) plasma. Centrifuge sample and separate plasma from cells within 2 hours of collection. Transfer plasma to a plastic transport tube. Refrigerate.