The nurse is evaluating the effectiveness of warfarin in a patient with atrial fibrillation. The patient's prothrombin time (PT) is 20 seconds. The nurse should anticipate:

Administering the next dose of warfarin


•A normal PT is 11-12.5 seconds. For patient's on warfarin, the therapeutic level is 1.5 to 2 times the normal level.

•A PT of 20 seconds falls within the therapeutic range, so the dose should not be held or altered.

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