Se'' for serum. Laboratories approved to screen both blood and serum would therefore have ''SBSe'' listed after their laboratory name. Se'' for serum. Laboratories approved to perform confirmatory analyses on both serum and blood would therefore have ''CBSe'' listed after the name of their laboratory. Screening analyses provide a presumptive indication that a controlled substance is present.
Confirmatory testing is used to substantiate screening results.
They should also determine that the director of the facility is agreeable to performing analyses for forensic purposes. Persons seeking the analyses are responsible for specifying the extent to which the presence of a controlled substance is to be verified. That specification should be predicated upon the purpose for which the analysis is being sought. The list of approved laboratories will be revised semiannually and published in the Pennsylvania Bulletin. No part of the information on this site may be reproduced for profit or sold for profit.