140. Among the controls which the director of a medical biology laboratory must establish are:(a) the analysis of standards for the examinations requested must be made each day. The results of the examination of the standard must be compiled every day in a book used exclusively for that purpose;
(b) the acceptable margin limits for each of the methods used in case of haematology, biochemistry or radioisotope analyses must be established. Such limits thus determined must be shown in respect of every result reported by the laboratory.