Consolidated Political Compass Test (CPCT) Practice Exam 2025 - Free CPCT Practice Questions and Assessment Guide

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What is the main function of sodium fluoride in the gray tube?

To promote blood clotting

To preserve glucose

The primary function of sodium fluoride in the gray tube is to preserve glucose. Sodium fluoride acts as a glycolytic inhibitor, which means it prevents the breakdown of glucose in the sample after collection. This is particularly important for accurate glucose testing, as unpreserved samples can lead to a decrease in the measured glucose levels over time due to cellular metabolism. In standard laboratory practice, maintaining the integrity of glucose levels is crucial for diagnosis and treatment decisions.

While several other substances in tubes may have functions such as promoting clotting or removing toxins, sodium fluoride is specifically used in conjunction with other anticoagulants to ensure glucose levels remain stable until analysis. This makes it a key component for tests that require precise glucose measurement.

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To remove toxins

To inhibit hemolysis

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