Quality Flashcards
What is validation?
- rigorous assessment process of e.g. a new assay
- usually involves significant change such as a new test
- defines characteristics of the new assay such as accuracy, limitations, behaviour of controls,
- is the test correct?
What is verification?
- less rigorous process than validation
- may involve a commercial CE marked kit
- may involve comparing a kit to an existing method to find out if we can transfer over e.g. bisulphite conversion kit - might run 10 samples though just to check it works OK.
- more of a minor change
Why are validation and verification important?
- evaluate performance of a test
- to give objective evidence that the method in question is accurate
- ultimately ensure the patient is getting the correct result
What does robustness mean?
- can also be called ruggedness (this is actually more technically correct)
- it is the reproducibility of the assay under normal but variable conditions such as varying regents, varying equipment, varying users.
- a good laboratory assay needs to hold steady despite these variations to be usable in a diagnostic lab.
- robustness is actually an investigation into how the assay responds to deliberate changes such as halving the amount of a particular reagent that goes in, or deliberately setting the temperature too low and can help you learn how to troubleshoot the assay later down the line if things go wrong.
What does repeatability mean?
- find out whether the assay can consistently produce the same results when the same sample is input multiple times
- known as within-run precision
- how much confidence can we have in this method
- all other parameters remain unaltered
What is reproducibility?
- between run precision
- will the same sample produce the same result time after time
What is sensitivity?
- ability of the assay to correctly identify all positive samples
- is it sensitive enough to detect every methylated patient?
What is specificity?
- ability of the assay to correctly identify all the samples which are negative?
- e.g. do you get any false positives or is it highly specific?
Why do we need to consider all these factors during a validation?
- objective evidence about assay performance
- evidence it is accurate
- evidence it is safe for use on patients
- right results for the patient every time
What UKAS standard are we assessed against?
ISO 15189: 2012 - Requirements for quality and competence
Why is UKAS accreditation important?
Demonstrates competence, impartiality and performance capability.
Gives users confidence that our service is high quality.
That the PATIENT will get the right test and the right result!
- regularly assesses the lab against international standards
- proves we have a solid system of continual quality improvement
- proves that all our staff are competent and trained appropriately
- lab is constantly striving to improve quality e.g. learning from incidents to improve our service.
- that the lab takes part in approved external quality assessment schemes
What is registration? Why is it important?
It is a recognised standard across the UK and provides significant public protection from unprofessional or unethical behaviour.
It reassures patients, the public, users and employers that you are appropriately qualified, competent and safe to practice.
Who is registration controlled by?
HCPC - Health and Care Professions Council
What is the HCPC?
They protect the public by regulating several professions including Clinical Scientists
They do this by holding a register of professionals that can be searched online
They set the standards for education, training and practice which must be met in order to practice
Who regulates the HCPC? State something they could do?
The Professional Standards Authority.
They could overturn a fitness to practice ruling if they felt it was too lenient and puts the public at risk.