Qualitative and Quantitative Proficiency Test (PT) for laboratories performing GC-MS Assay of pharmaceutical material by USP general chapter <736> or equivalent. Participants may report qualitative and/or quantitative results. Samples provided as a three sample panel. Each sample will contain 1.5 mL sample volume and is sufficient for duplicate analyses. One of three samples will be positive for target analyte. Two of the three samples will be negative for the target analyte. Indicate present for sample that contains the target analyte(s) and indicate absent for the two samples that do not contain the target analyte(s).