- Laboratory  Review of Adverse Analytical Findings  and Atypical Finding s At a minimum, the review of Adverse Analytical Findings  and Atypical Finding s shall include:  o Documentation linking the Sample  external code (as specified in the DCF) to the Laboratory  internal Sample code;  o Laboratory Internal Chain of Custody  documentation;  o Initial  Testing  Procedure (s) and Confirmation Procedure (s) analytical data and calculations;  o Quality control data;  o Completeness of technical and analytical documentation supporting the reported findings;     ISL – January 2021 Page 104 of 160 o Compliance of test data with the Analytical Testing  Procedure ’s validation results ( e.g.