Relational Online Analytical Processing (ROLAP) provides the same solution but uses a relational database for storage of the data. This approach translates native OLAP queries, written in a language called multidimensional expressions ( MDX ) into the appropriate SQL statements. This is primarily done to prevent the need for another copy of the data. The data created directly by the online transaction processing (OLTP) applications are used. The primary disadvantage to this solution is that it does not, generally speaking, perform as well as a MOLAP database.
International standardization bodies such as the ISO 6710 have issued standards for type and concentrations of anticoagulants to be used for venous blood samples.
The National Committee for Clinical Laboratory Standards (NCCLS) in the . constantly update their guidelines on several aspects of the preanalytical phase. An updated listing of the NCCLS Standards can be found in their current catalogue available from NCCLS.
The checklist prepared by the College of American Pathologists for Laboratory Inspection and Accreditation addresses specimen related preanalytical variables.