Gel and Clot Activator Tube Heparin Tube ESR Tube Plain and Serum Tube Citrate/PT Tube Specification: Citrate/PT Tube: 1.8ml 2.7ml 3.6ml 4.5ml ESR Tube: 1.6ml 2.4ml 4ml 1.28ml 1.6ml Gel and Clot Activator Tube: 1ml-----10ml Heparin tube: 1-----10ml. EDTA tube: 1-----10ml. Plain and Serum tube: 1-----10ml. Glucose tube: 1-----10ml.