68. A phlebotomist has orders for the following tests: CBC, chemistry panel, lead, and a toxicology screen via capillary puncture. Which of the following should be collected?
Answer: B
Lavender top tube should be collected for the tests.
The lavender top tube is used for hematology tests, including the complete blood count (CBC) and certain chemistry tests. Therefore, it is the appropriate choice for the specified tests.
A) Red top tube
The red top tube is primarily used for serum tests and does not contain any additives. It is not suitable for the CBC test as it does not preserve the cellular elements required for hematological analysis.
B) Lavender top tube
The lavender top tube contains EDTA, an anticoagulant that prevents blood from clotting. This makes it appropriate for the CBC test, and it can also be used for some chemistry tests that require whole blood or plasma, making it the correct choice for the tests ordered.
C) Light blue top tube
The light blue top tube contains sodium citrate, which is used primarily for coagulation tests. It is not suitable for the CBC or the other tests listed, making it an incorrect option for this collection.
D) Royal blue top tube
The royal blue top tube is often used for trace element testing and toxicology screens, but it is not appropriate for collecting a CBC or a chemistry panel. Therefore, it does not meet the requirements for the tests ordered.
Conclusion
The lavender top tube is the only option that meets the requirements for collecting a CBC and the associated chemistry tests. The other options either do not contain the necessary additives or are not suited for the specific tests required, confirming that option B is definitively correct.