Blue top tube - Sodium Citrate (NaCitrate)
This tube is primarily used for coagulation studies (PT and PTT). Complete filing of this tube is essential to obtain accurate results.
Lavender top tube - EDTA
EDTA is the anticoagulant used for most hematology procedures. Its primary use is for the CBC and individual components of the CBC. The larger 6 mL tube is used for blood bank procedures.
Red top tube
This tube has no anticoagulant and is used for many chemistry tests, drug levels, and blood bank procedures.
Navy blue top tube
There are two general types - one with K2 EDTA and one with no anticoagulant. This tube is used primarily for trace metal analysis.
Serum Separator Tube (SST®)
This tube contains a clot activator and serum gel separator. It has no anticoagulant and is used for many chemistry tests. It cannot be used for certain drug levels or any blood bank procedures.
Green top tube
Sodium Herparin or Lithium Heparin
Grey top tube
Potassium Oxalate. This tube is used primarily for glucose tolerance testing.
Yellow top tube
ACD (Sol. A or Sol. B)