Final answer:
Blood collected in a tube with no additive is generally used for (b) chemistry testing, which requires the natural clotting of blood to separate cells from the plasma for serum analysis.
Step-by-step explanation:
If blood is collected in a vacuum tube containing no additive, it is typically used for chemistry testing. This type of tube allows the blood to clot naturally, which is necessary for serum-based chemistry tests. The clotting process separates the blood cells from the plasma, providing a clear serum sample for testing.
This serum can then be analyzed to determine levels of electrolytes, enzymes, lipids, sugars, hormones, etc. Coagulation testing, in contrast, would require an additive to prevent clotting; hematology typically requires an anticoagulant like EDTA; and immunology could require various additives depending on the specific test.