A non-numerical prothrombin time (pt) result of "no coagulation" was obtained on a patient sample on the sysmex cs-2100i system using dade innovin reagent.The initial result was not reported to the physician(s).The patient was re-drawn and the new sample was run on the same system and using the same reagent.The results obtained on the redrawn sample was considered to be correct and the pt international normalized ratio (inr) was reported to the physician(s).The initial sample was repeated on the same system and using the same reagent, resulting in a lower pt and pt inr result and a higher pt % results.The initial sample was also repeated using the same system and same reagent in extended time, resulting in a flagged no coagulation result.There are no known reports of adverse health consequences due to the discordant, falsely low pt inr results.
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