On (b)(6) 2020, customer released an inr greater than 16.0 following two repeated vmax error on the pt test.According to the customer, quality control before and after the results were in range.Customer performed the maintenance of the instrument and repeated again the test: inr= 2.4.The corrected result was called to provider: no change made to patient therapy due to the initial result.Then on (b)(6) 2020, qc for pt and ptt were in vmax error.Qc repeated within range but after a third run, ptt qc were in vmax again.Instrument taken out of service and samples frozen.A technical intervention has been asked and performed the same day: the technician found a needle clogged and replaced needle from customer inventory.Preliminary conclusion: the most likely root cause was a clogged needle.
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