A client on a continuous heparin infusion has an aPTT of 62 seconds. The control is 30 seconds, and the protocol target is 1.5 to 2.5 times control. How should the nurse interpret this?

A. The aPTT is too low and the dose needs to increase
B. The aPTT is within the therapeutic range
C. The aPTT can't be interpreted without an INR
D. The aPTT is dangerously high

Show answer and rationale

Correct answer: B

1.5 to 2.5 times a 30-second control is 45 to 75 seconds. 62 seconds is therapeutic. Many facilities now use anti-Xa levels instead, following their protocol.

Source: Lehne's Pharmacology for Nursing Care, 12th ed. (heparin monitoring)

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A client on a continuous heparin infusion has an aPTT of 62 seconds. The control is 30 seconds, and the protocol target is 1.5 to 2.5 times control. How should the nurse interpret this?

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