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THCA, QUANTITATIVE, SERUM

Mnemonic

THC S

Synonym

Cannabinoids - Delta-9 Tetrahydrocannabinoid - THC - Marijuana

Includes

THC metabolite, THCA only

Guidelines

This testing should only be ordered when a urine specimen is not available for testing. Urine is the preferred specimen for drugs of abuse testing.

Specimen Collection Requirements

Collect

Serum or Plasma, one 7.0 mL red, 4.0 mL dark green (sodium heparin) or 4.0 mL lavender (EDTA) top tubes.
SST and PST tubes are NOT recommended.

Handling

Allow serum to clot completely at room temperature (minimum: 30 minutes). Centrifuge and separate serum or plasma from cells ASAP.

Preferred Volume

3 mL

Minimum Volume

1 mL (Whole Blood 2.5 mL minimum draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Serum that has been in contact with serum separator gel

Stability

Ambient (20-25°C): 1 week; Refrigerated (2-8°C): 2 months; Frozen (at or below -20°C): 3 months

Testing Information

Performed

Wed, Fri

Reported

1-5 days

Method

Liquid Chromatography Tandem Mass Spectrometry

Reference Values

Reference Values

NOT DETECTED: THCA < 2 ng/mL

Comments

THCA is the primary metabolite of THC. (delta-9-tetrahydrocannabinol, marijuana's major psychoactive ingredient). This test cannot differentiate between prescribed (e.g. Marinol), medical marijuana, or illicit forms of marijuana. This test cannot distinguish between active or passive marijuana exposure, or if the patient is under the influence of marijuana at the time of the specimen collection.

CPT Codes

82542

Last Updated: Tuesday, August 1, 2017 08:15:38 AM


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