Phil is drawing for multiple tests: a CBC, PT & PTT, blood glucose level and thyroid panel. Phil recalls from class that collection tubes are drawn in order. Phil arranges the collection tubes in this order: lavender top, light blue top, gray top and SST/ tiger top. What (if anything) has Phil done wrong?

Question

Quizplus · Accepted Answer

Phil may remember to arrange collection tubes in order, but he does not remember the purpose or the correct order of draws. Understanding what the color top system represents, as well as the different kinds of additives used, will aid in understanding the purpose of the order of draws. When drawing for multiple tests, collection tubes must be drawn in a specific order (determined by the colored top) to avoid cross-contamination of specimens by the additives. Additive cross-contamination may alter test results and/or result in the sample being rejected by the laboratory.

Phil Is Drawing for Multiple Tests: a CBC, PT