Question

Of the following tubes or containers, which is filled first in the ETS order of draw?

A. Light blue-top tube
B. Lavender-top tube
C. Green-top tube
D. Red-top tube

Answer 1

In the ETS order of draw, the light blue-top tube is filled first.

Step-by-step explanation:

The ETS (Evacuated Tube System) order of draw is a standardized order in which blood samples are collected. In this order, the tubes or containers are filled in a specific sequence to prevent cross-contamination and ensure accurate test results. The correct order of draw is as follows:

1. Light blue-top tube - This tube contains sodium citrate, which is used for coagulation tests like PT, APTT, and INR.
2. Lavender-top tube - This tube contains EDTA, which is used for complete blood count (CBC) and blood bank tests.
3. Green-top tube - This tube contains heparin or lithium heparin, which is used for plasma or whole blood tests like electrolytes, glucose, and some enzymes.
4. Red-top tube - This tube does not contain any additives and is used for serum tests like chemistry, serology, and blood bank tests.

Therefore, the light blue-top tube is filled first in the ETS order of draw.