What type of requisition is needed for a blood culture?

A blood culture is specifically designed to detect the presence of microorganisms in the blood, which is essential for diagnosing infections like bacteremia or sepsis. The requisition needed for this type of test falls under microbiology because it involves the study of microorganisms, including bacteria and fungi.

Microbiology requisitions are tailored for the collection, handling, and analysis of specimens to identify pathogens, assess their growth, and guide treatment options. Blood cultures require careful collection and processing to ensure accurate results, which is why they are categorized distinctly within microbiology.

The other options pertain to different areas of laboratory testing: histopathology deals with the study of tissue samples to diagnose diseases based on cellular structure, cytology focuses on the examination of cells to detect abnormalities, and transfusion medicine involves the testing and matching of blood for transfusions. None of these areas pertain directly to the isolation and identification of microorganisms from blood, which is the primary objective of a blood culture.