American Medical Technologist (AMT) Practice Exam 2026 – All-in-One Resource to Guarantee Exam Success!

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What colored stopper is associated with an anticoagulant used for blood glucose testing?

Red top

Light blue top

Light grey top

The light grey top tube is associated with an anticoagulant that is particularly used for blood glucose testing. This tube typically contains sodium fluoride, which acts as a glycolytic inhibitor, preventing the breakdown of glucose by cells in the blood sample. By inhibiting glycolysis, the sodium fluoride ensures that the glucose levels remain stable until the sample can be analyzed, providing a more accurate measurement of glucose concentration.

This is especially significant in glucose testing, where accurate results are crucial for diagnosing conditions such as diabetes. In contrast, the other colored stoppers, like the red top, light blue top, and green top, are associated with different additives and purposes, making them unsuitable for glucose testing in a manner meant to preserve the integrity of the glucose measurement.

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Green top

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