Heparin sodium is prescribed for the client. Which laboratory result indicates that the heparin is prescribed at a therapeutic level?  1. Thrombocyte count of 100,000 mm3 2. Prothrombin time (PT) of...

Heparin sodium is prescribed for the client. Which laboratory result indicates that the heparin is prescribed at a therapeutic level?

 1. Thrombocyte count of 100,000 mm3 2. Prothrombin time (PT) of 21 seconds 3. International normalized ratio (INR) of 2.3 4. Activated partial thromboplastin time (aPTT) of 55 seconds