Enrollment Deadline: 15 June 2026

Participants will analyze the contents of three vials, collect quantitative and qualitative data, and report their results.

Sample Description: Three vials, each containing 5 mL of whole human blood and unknown case-like concentrations of THC, THC metabolites, or both, including the possibility of a negative sample. Analyte levels are in case-like ranges.

Samples ship in October.

Additional Information: This test is open to laboratories outside of the USA (including D.C., but excluding other territories), but laboratories must determine if there are any restrictions on the import of liquid blood samples into their country. Participating laboratories are responsible for any additional duties or taxes for the import of biological materials. Shipments not accepted for delivery or refused entry into a country are destroyed, and any disposal costs will be billed to your laboratory.

This test is included on CTS' Scope of Accreditation to ISO/IEC 17043.