Disposable vacuum blood collection tube which with no additive.
Plain tube: red cap collection blood tube does not contain additives, it also does not contain anticoagulation, promoting coagulation components, only vacuum. It doesn’t need to shake after blood drawing. The type of specimen preparation was serum, which was placed in 37℃ water bath for more than 30 minutes after blood drawing, and the upper serum was centrifuged for use.