Specimens collected by venipuncture that require preparation of a blood smear are collected in:

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Blood specimens collected by venipuncture that require preparation of a blood smear are collected in lavender stopper tubes. Lavender top tubes contain the anticoagulant EDTA, which prevents clotting and preserves the cellular components of the blood. The EDTA-treated blood is ideal for making blood smears for examination under the microscope, as it ensures a uniform distribution of cells on the slide. Blue top tubes (A) contain sodium citrate and are used for coagulation testing. Green top tubes (C) contain the anticoagulant heparin and are used for chemistry tests. Gray top tubes (D) contain oxalate or fluoride and are used for glucose and lactate testing.

Specimens Collected by Venipuncture That Require Preparation of a Blood