Blood Tubes Abbreviation Specimen Description

Gray-top tube

(GL) Contains sodium fluoride anti-coagulant. Primarily used to preserve glucose levels. Plasma – transfer to plastic vial and label with patient’s name and “fluoride plasma”. Whole blood – send filled tube.
Green-top tube (HE) Contains sodium heparin anti-coagulant. Plasma – transfer to plastic vial and label with patient’s name and “heparin plasma”. Whole blood – send filled tube.
Lavendar-top tube (ED)

Contains EDTA anti-coagulant. Plasma – transfer to plastic vial and label with patient’s name and “EDTA plasma”. Whole blood – send filled tube.

Light Blue-top Tube (CI)

Contains sodium citrate anti-coagulant. Plasma – transfer to plastic vial and label with patient’s name and “citrate plasma”. Whole blood – send filled tube.

Red-top tube (SE)

Contains no anti-coagulant or preservative. Primarily used for therapeutic drug levels. Separate serum from cells and transfer to plastic vial. Label with patient’s name and “serum”.

Royal Blue-top tube (O)

Contains no anti-coagulant. Primarily used for trace metal studies. Serum – transfer to plastic vial and label with patient’s name and “serum royal blue”.

Royal Blue-top, EDTA (O)

Contains EDTA anti-coagulant. Primarily used for trace metal studies. Plasma – transfer to plastic vial and label with patient’s name and “EDTA plasma royal blue”. Whole blood – send filled tube.

Royal Blue-top, Heparin (O) Contains heparin anti-coagulant. Primarily used for trace metal studies. Plasma – transfer to plastic vial and label with patient’s name and “heparin plasma royal blue”. Whole blood – send filled tube.
Serum Separator tube (SE)

Contains gel-barrier. Serum – allow blood to clot and centrifuge tube. Unless otherwise stated, this tube may be submitted for assays requiring serum.

Yellow-top tube (O) Contains either ACD or SPS anti-coagulant. SPS is used primarily for Microbiology specimens. Whole blood – send filled tube.