3 December 2018 (Monday) - ISI

There was a discussion today on the Haematology Interest Group about how much variation there is between analysers when producing an INR; particularly with the higher values.
I always thought that we took the trouble to calculate an IS for each analyser with each reagent to avoid such a problem... Can a manufacturer-provided ISI *really* work? It strikes me that the evidence says it doesn’t.

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