Question

why heparin does not work outside the body?​

Answer 1

Answer:

Patients treated with heparin are monitored by a blood test daily to see if their dose is optimal. The blood test used to check a patient's heparin level is the activated partial thromboplastin time (aPTT). The doctor adjusts the dose of heparin based on these blood test results.

                   or

Blood clotting, or coagulation, is an important process that prevents excessive bleeding when a blood vessel is injured. Platelets (a type of blood cell) and proteins in your plasma (the liquid part of blood) work together to stop the bleeding by forming a clot over the injury.