A client is admitted with a confirmed pulmonary embolism (PE). Six hours after heparin IV infusion is initiated, the client's partial thromboplastin time (PTT) is 152 seconds, so the infusion is discontinued. Which intervention is most important for the nurse to implement? Reference Range: Partial Prothrombin Time (PTT) [27 to 41 seconds]

A. Obtain hemoglobin and hematocrit levels: A PTT of 152 seconds is significantly elevated, indicating a high risk of spontaneous bleeding. Monitoring hemoglobin and hematocrit helps detect internal or occult bleeding early. B. Measure and record the client's IV fluid intake: While maintaining hydration is important, fluid intake does not directly address the risk associated with excessive anticoagulation. It is a routine measure, not a priority in this context. C. Compare pedal pulse volume bilaterally: Assessing pedal pulses is important for evaluating perfusion, but it does not directly relate to the current risk of bleeding from excessive anticoagulation. It would be more relevant in the initial PE assessment. D. Perform guaiac tests on the client’s next stools: Testing for occult blood is helpful in identifying gastrointestinal bleeding. However, waiting for the next bowel movement could delay detection. Hemoglobin and hematocrit offer more immediate insight into bleeding risk.