Canadian Practical Nurse Registration Examination (CPNRE) Practice Exam

Heparin typically has a duration of action that can be influenced by several factors, but generally, it lasts in the body for about 4 to 6 hours. This timeframe is pivotal for managing anticoagulation therapy, especially in acute settings such as during a hospital admission. The half-life of heparin is one of the key elements in determining its duration, allowing healthcare professionals to time subsequent doses based on the patient's bleeding risk and the desired level of anticoagulation.

When heparin is administered, its effects can be observed almost immediately, which is why it's often utilized in situations where quick anticoagulation is required. The relatively short duration necessitates careful monitoring and adjustment of dosing schedules to maintain therapeutic levels and minimize the risk of complications.

The choice indicating 8-12 hours does not align with typical clinical experiences and half-life data for heparin, which is why it wouldn't be the most accurate representation of how long the medication lasts.