Walk-In Lab logo
  • 0

Tetrahydrocannabinol (THC), Screen Only, Whole Blood Test

Share copy the link
Link copied!
share on Twitter Share on Facebook Share on Pinterest

The Tetrahydrocannabinol (THC), Screen Only, Whole Blood Test is used to screen for marijuana use by detecting the presence of THC in the blood.


Test Code:


CPT Code(s):



Presumptive testing by immunoassay (IA) at a testing threshold of 5 ng/mL. Presumptive positives are not confirmed by a definitive method.


Whole Blood


No special preparation is required.

Test Results:

3-5 days. May take longer based on weather, holiday, or lab delays.

Walk-In Lab is prohibited from selling LabCorp tests to residents in the following states:NY, NJ, RI, MA, MD

What is the purpose of this test?

Order this Tetrahydrocannabinol (THC), Screen Only, Whole Blood Test, which is used to screen for marijuana use by detecting the presence of THC in the blood. Marijuana, also known as cannabis, produces compounds called cannabinoids, such as tetrahydrocannabinol (THC). These compounds have varying effects on the body and may be used for medical or recreational purposes. 


Marijuana testing is commonly conducted using a urine sample, but blood, saliva, and hair samples may also be used. Testing for marijuana use may be done for various reasons, such as medical screening, employment, or athletic purposes. The detection window for marijuana use can range from a few days to several weeks or even months, depending on the amount and frequency of use and the type of sample collected. For example:


  • Blood: Up to 7 days
  • Hair: Up to 90 days
  • Saliva: Up to 24 hours
  • Urine: Up to 3 days (up to 6 weeks in heavy users)


Drug testing for marijuana involves the analysis of cannabinoids or cannabinoid metabolites in a blood, hair, saliva, or urine sample. Metabolites are substances that are produced when the body breaks down a drug. Although marijuana has over 100 different cannabinoids, only a few of them and their metabolites are typically measured in marijuana testing. This test measures delta-9-THC metabolite, the primary psychoactive cannabinoid in marijuana.


When should I order a Tetrahydrocannabinol (THC), Screen Only, Whole Blood Test?

Individuals may order this test as part of pre-employment or athletic drug screenings. Many federal employees undergo drug testing as part of a drug-free workplace policy. This applies to various industries, including transportation and national security. Law enforcement and emergency service providers may also be subject to drug testing. Federal, state, and local laws impact drug testing requirements. Marijuana use is illegal under federal law, so employers may penalize individuals for using it, despite state legalization.

Search for a Lab Test, Home Kit or Discount Panel:

Today's Offers