UKNEQAS BLOOD COAGULATION
A Shorter Guide
The same test, performed on the same specimen, should give the same answer wherever and by whoever it is carried out.
In practice, of course, coagulation tests are generally biologically based tests performed on biological specimens, and there will always be a certain amount of variation, but any individual test result should be similar to everyone else's.
For each test, a consensus is determined - the result, or range of results, on which most participants agree. Individual participant's performance for a given test is then compared to the consensus.
If the result for a given test for a given participant is repeatedly (from survey to survey) different to everyone else (outside the consensus) then it may indicate that the participant has a problem with that test.
For a more detailed explanation of how this is done for each test, please read Coagulation Performance Analysis