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. 2021 Nov 16;8(2):e001784. doi: 10.1136/openhrt-2021-001784

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

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INR tests and recorded TTRs in warfarin patients. (A) Number of patients having an INR test, and the total number of INR tests carried out, per thousand warfarin patients. (B) Number of patients having a TTR recorded, and the total number of TTRs, per thousand warfarin patients. (C) Mean TTR value across warfarin patients tested. (D) Monthly rate of elevated INRs (as >8 and ≥8) recorded in warfarin patients per thousand warfarin patients and thousand patients having an INR test. INR, international normalised ratio; TTRs, time in therapeutic range.