Canadian Practical Nurse Registration Examination (CPNRE) Practice Exam

The normal range for activated Partial Thromboplastin Time (aPTT) is typically between 30 and 60 seconds. This test measures the time it takes for blood to clot and is essential for assessing the intrinsic and common pathways of the coagulation cascade. The aPTT is often used to monitor patients on anticoagulant therapy, particularly those receiving heparin, as it helps ensure that bleeding risks are minimized while still providing adequate anticoagulation.

When evaluating the values typically seen in aPTT tests, a result within 30 to 60 seconds indicates that the coagulation factors are functioning effectively. A result below this range may indicate a risk of increased bleeding, while a result above this range may suggest a risk of clotting issues or inadequate anticoagulation. This is why the choice of 30-60 seconds is recognized as the standard normal range.

Values outside of this range may suggest potential underlying conditions or necessitate adjustments in medication dosages, making understanding the normal range critical for nursing practice and patient safety.