In the evacuated tube system, what position should the gold tube be collected?

In the evacuated tube system, what position should the gold tube be collected?

• A. 5th
• B. 3rd
• C. 1st
• D. 7th

Answer: (A)

In the evacuated tube system, the order of draw is chosen to prevent additives in one tube from contaminating the next one and altering test results. The gold tube is a serum separator tube with a clot activator and gel, used to produce a clean serum sample after clotting. Placing it in its designated spot ensures that its clot activator and gel do not interfere with the tests that follow, while still allowing proper serum collection. If the gold tube were drawn too early, its clot activator could contaminate subsequent tubes and affect tests that rely on unaltered anticoagulants or additives. If it were drawn too late, the preceding tubes might carry over substances that could complicate or bias downstream assays. Positioning the gold tube where it belongs minimizes cross-contamination and preserves the integrity of both serum and subsequent specimens.

In the evacuated tube system, the order of draw is chosen to prevent additives in one tube from contaminating the next one and altering test results. The gold tube is a serum separator tube with a clot activator and gel, used to produce a clean serum sample after clotting. Placing it in its designated spot ensures that its clot activator and gel do not interfere with the tests that follow, while still allowing proper serum collection.

If the gold tube were drawn too early, its clot activator could contaminate subsequent tubes and affect tests that rely on unaltered anticoagulants or additives. If it were drawn too late, the preceding tubes might carry over substances that could complicate or bias downstream assays. Positioning the gold tube where it belongs minimizes cross-contamination and preserves the integrity of both serum and subsequent specimens.