Complex sentence: The most commonly performed test is the complete blood count (CBC) also called full blood count (FBC), which Coagulation is a sub-specialty of hematology; basic general coagulation tests are the prothrombin time (PT) and partial thromboplastin time (PTT).
Split into simpler sentences: The most commonly performed test is the complete blood count (CBC) also called full blood count (FBC). Studies of blood coagulation is a sub-specialty of hematology; basic general coagulation tests are the prothrombin time (PT) and partial thromboplastin time (PTT).