Needle Gauge Colors and stopper colors
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White Needle
16G
Pink needle
18g
Cream Needle
19G
Yellow needle
20g
Green Needle
21G
Green needle
21g
Black Needle
22G
Blue needle
23g
blue stopper
ANTI-COAGULANT: Citrate BLOOD TESTS: Clotting function tests (i.e. prothrombin time)
Purple stopper
ANTI-COAGULANT: EDTA BLOOD TESTS: CBC, platelet count, heartworm, reticulocyte count, fibrinogen, sed rate
Grey stopper
ANTI-COAGULANT: Glycolytic inhibitor BLOOD TESTS: Glucose determinations on plasma.
Green stopper
ANTI-COAGULANT: Heparin, (Lithium) BLOOD TESTS: Blood gases, pH, avian and reptilian CBC and chemistries
red stopper
ANTI-COAGULANT: None (clot tube or SST) BLOOD TESTS: Serum Chemistries
