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.
PTT vs PT. PTT is âpartial thromboplastin timeâ, and PT is âprothrombin time.â Both PTT and PT are tests used for measuring the time taken for the blood to clot. These two tests are mainly conducted for checking for bleeding problems or the chances of excessive bleeding during surgery.