Final answer:
Lavender-topped tubes are indeed used for routine CBC counts because they contain EDTA, which prevents blood clotting and preserves blood cells for accurate analysis.
Step-by-step explanation:
The statement "Lavender-topped tubes are used for routine CBC counts." is true. These tubes contain an anticoagulant called EDTA (ethylenediaminetetraacetic acid), which prevents the blood from clotting. EDTA is the preferred anticoagulant for hematological tests because it preserves the shape of blood cells and the structure of the blood for accurate counting and evaluation. In clinical settings, when a complete blood count (CBC) is ordered, medical professionals most commonly use lavender-topped tubes to collect the blood specimen. The use of the correct tube ensures the validity of the CBC results, which is an essential diagnostic tool in healthcare.