Lab test

Marijuana Cannabis (Weed) Drug Test

This blood test screens for cannabinoids, the compounds associated with marijuana (cannabis) use.

Typical price

From $199

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

This blood test screens for cannabinoids, the compounds associated with marijuana (cannabis) use. It uses an immunoassay to detect cannabinoid-class substances, most notably THC-related analytes. Blood testing reflects recent circulating exposure rather than the long-lived metabolites that can persist in urine, so it is most informative shortly after use. Because cannabinoids clear from blood within a relatively short period, the timing of collection strongly influences whether recent use is detected.

• Cannabinoids (THC) Tetrahydrocannabinol and related compounds associated with cannabis that are detected in blood.

• A clinician needs to assess very recent cannabis exposure via blood.
• You are in a setting where a blood specimen is required for drug screening.
• You use a prescribed cannabinoid product and its detection is relevant.
• A medical evaluation requires screening for cannabinoids alongside other substances.

• No fasting is required for this blood screen.
• Tell the clinician about any cannabis, hemp, or prescribed cannabinoid products you use.
• Mention all other medications, including sedatives and pain relievers.
• Hydrate normally before the blood draw.

A negative blood cannabinoid screen suggests THC was not detected above the cutoff at the time of collection. Because THC clears from blood quickly, a negative result does not rule out use in prior days. A positive screen indicates recent circulating cannabinoids but does not measure impairment. Interpretation depends on context; discuss the findings with a healthcare provider.

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