How does a lab run Quality Control?

Quality is a serious business! Promise of safety and accuracy, Quality is more than a practice that can be brought with money!

How does a lab run Quality Control?


Quality is a desire for everybody who pays. It is considered a value for money identity and also something that arises out of policies and practices in place. 


Quality management in processes and services is a serious business and in patient care and management involving diagnosis  and treatment, it is a need and becomes a great value add. Routines in any diagnostic laboratory include every step from sample collection, to testing and further ensuring right report to the right patient/client. Though following ethics and international quality practices is a conscientious road, without documentary evidences, they stand null and void. Quality Management System (QMS) becomes the Holy Grail for any lab to document all the quality practices proposed, promised and proven to be in use. The proof is quality certifications like NABL and CAP which a laboratory earns.


Quality Control (QC) facts:

üProcedures and results aid in validation of instrument performance as well as add reliability to patient results

üInvolves use of certified reference material and further statistical process controls

üThe material used is similar to biological fluids tested and is made from blood, serum, urine or spinal fluid

üIt is pre-packaged and available in liquid or lyophilized state having known concentration of analytes

üThese are available in different concentration ranges to include both clinically normal and abnormal ranges for every 

analyte tested


The QC process:

üThe QC materials are to be processed in the same way as patient samples

üGood quality practice involves testing both normal and abnormal levels of QC material each day

üFrequency of testing QC material also depends on workload for the test and hence is tested in three stages – Pre, mid and post QC stages

üResults from all the QC runs are evaluated to validate reporting vs. pre-defined ranges


The QC process does not stop with running the QC material in the machine and ensuring compliance, but beyond that to assess minor or major outliers using statistics. The clinical result of the patient report can fall in any end of the reporting spectrum and hence statistical backbone like Mean and Standard Deviation when applied to the combined QC database, will help the lab to monitor any non-performance. 


“A practice that arises out of due diligence;

QC processes lie in a roadmap which a laboratory can never decline to hold”

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