Final answer:
The calculation of the number of thrombocytes in the blood is called a platelet count. Thrombocytes are more accurately called platelets and play a key role in hemostasis.
Step-by-step explanation:
The calculation of the number of thrombocytes in the blood is known as a platelet count. Thrombocytes, more commonly and accurately referred to as platelets, are cell fragments critical for the process of hemostasis, which helps to stop bleeding. A platelet count is part of a complete blood count (CBC) and is essential for diagnosing and monitoring conditions that affect platelet numbers like thrombocytopenia (low platelet count) or thrombocytosis (high platelet count).