Final answer:
An ordered blood culture should be drawn in a yellow top tube to prevent clotting and allow proper analysis in the laboratory.
Step-by-step explanation:
An ordered blood culture should be drawn in a yellow top tube.
When ordering a blood culture, it is important to use a yellow top tube to collect the blood sample. This is because the yellow top tube contains a specific anticoagulant called Sodium Polyanethol Sulfonate (SPS), which helps prevent the blood from clotting.
By using a yellow top tube, the blood sample can be properly cultured and analyzed in the laboratory to detect any potential infections or bacteria present in the blood.