What color tube is typically used for collecting a sample that will be tested for electrolytes?

The green tube is typically used for collecting samples that are tested for electrolytes, primarily due to its additive, which is usually heparin. Heparin is an anticoagulant that prevents the blood from clotting, allowing for accurate analysis of serum components, including electrolytes like sodium, potassium, and chloride.

The green tube is suitable for this type of testing because it can provide plasma samples without the interference caused by other additives found in tubes of different colors. When evaluating electrolyte levels, it is crucial to ensure that the sample is free from clot formation to maintain the integrity of the results.

In contrast, other colored tubes have specific uses related to different tests; for instance, the gray tube often contains additives for glucose testing, the light blue tube is typically used for coagulation studies, and the purple tube is intended for complete blood counts or blood banking. These differences in additives and intended purposes highlight why the green tube stands out for electrolyte testing.