The Terminology- SNOMED CTÂ®, an Evolving Clinical Reference Terminology. SNOMEDÂ® is the Systemized Nomenclature of Medicine. It is a controlled medical terminology (CMT). At its simplest, a SNOMED is a coded vocabulary of medical concepts and expressions used in healthcare.
The partial thromboplastin time (PTT) is a screening test that helps evaluate a person's ability to appropriately form blood clots. It measures the number of seconds it takes for a clot to form in a person's sample of blood after substances (reagents) are added.
If you have ever undergone oral anticoagulation therapy, you have most likely heard of the PT-INR test, but you may not understand what it is and/or what it means. This article will attempt to explain the PT-INR test. First let's talk about the PT test. PT stands for prothrombin time. It is a measure of how quickly blood clots. The traditional method for performing a PT test is to have your blood drawn and sent to a lab. At the lab, a substance called a reagent is added to your blood. The reagent causes the blood to begin clotting.