AOAC CASP Meeting

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Reproducibility 

The standard deviation or relative standard deviation calculated from among‐laboratory data. 

Expressed as the reproducibility standard deviation (SD R

); or % reproducibility relative standard 

deviation (% RSD R

). 

Recovery 

The fraction or percentage of spiked analyte that is recovered when the test sample is analyzed 

using the entire method. 

Hemp Plant Materials 

Fresh or dried, whole or milled plant material of low THC cultivars of Cannabis  spp.  

Total THC : the maximum potential percentage w/w delta‐9 tetrahydrocannabinol that the  test sample could yield on a dry weight basis including delta‐9‐THC and delta‐9‐THCA. 

5. Method Performance Requirements :   

See tables 2 and 3. 

6. System suitability tests and/or analytical quality control:

Suitable methods will include blank check samples, and check standards at the lowest point and 

midrange point of the analytical range.   

A detailed description of the method’s dry weight procedures and calculations must be included. 

7. Reference Material(s):

See tables 1A and 1B for sources of reference materials. 

Refer to Annex F: Development and Use of In‐House Reference Materials  in Appendix F: Guidelines  for Standard Method Performance Requirements , 19 th  Edition of the AOAC INTERNATIONAL Official  Methods of Analysis (2012).  Available at:  http://www.eoma.aoac.org/app_f.pdf 

8. Validation Guidance :   

An initial and important stage in cannabis testing is preparation of a homogeneous sample of the  plant material.  Detailed and complete procedures for reproducible preparation of test samples  from the plant material must be addressed during method validation and those data must be  included in the method validation submission.  A detailed description of the method’s dry weight 

procedures and calculations must be included in the submission. 

Appendix D : Guidelines for Collaborative Study Procedures To Validate Characteristics of a Method  of Analysis; 19 th  Edition of the AOAC INTERNATIONAL Official Methods of Analysis (2012).  Available 

at:  http://www.eoma.aoac.org/app_d.pdf