What is the primary use of a blood culture bottle?

The primary use of a blood culture bottle is to detect infections caused by bacteria or fungi in the blood. Blood cultures are critical in diagnosing bloodstream infections, such as septicemia, which can become rapidly life-threatening. When a sample of blood is placed in a culture bottle, it provides an optimal environment for any microorganisms present to grow. After incubation, laboratory technicians can identify the specific pathogens causing the infection and choose the most effective treatment based on those results.

The other options do not accurately represent the function of a blood culture bottle. Measuring blood glucose levels involves different types of tubes with specific additives, while complete blood counts require separate collection tubes that prevent clotting. Storing blood for future testing also does not align with the intended purpose of blood culture bottles, which are designed solely for the growth and identification of pathogens.