Phlebotomy Exam Prep 33, Blood Culture Order in Draw Sequence
Aug 12, 2026
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In this episode you will learn:
- Blood cultures must always be drawn first in the order of draw to prevent microbial contamination from non-sterile tube stoppers.
- The principle of 'sterile before systems' dictates that blood cultures precede all other tubes, including light blue top coagulation tubes, regardless of test priority.
- Inadequate blood volume is a critical factor that can lead to false-negative blood culture results, as it reduces the sensitivity of the test.
- After collection, blood culture bottles should be gently inverted 5 to 8 times to ensure proper mixing of blood and culture media without causing hemolysis.
- Pediatric blood culture collections have specific requirements, often utilizing a single aerobic bottle with a much smaller volume based on the patient's weight.
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