What are the hematological tests that require venipuncture?

Hematological tests that require venipuncture include complete blood count (CBC), blood typing and crossmatching, and coagulation studies such as prothrombin time (PT) and activated partial thromboplastin time (aPTT). These tests assess various components of blood, including red and white blood cells, platelets, and clotting factors. Venipuncture is preferred over capillary sampling for these tests due to the larger volume of blood needed and the need for accurate results.