I work in an Outpatient Infusion Clinic in a small hospital. We have recently acquired a 7 month old baby with short gut syndrome. He has a central line for TPN and blood draws. When drawing blood, I know that you mix the blood with heparin so you can give the waste back to the patient to decrease the amount of blood loss. What I need to know is how much blood do you draw back and how much heparin to you mix it with? Any help or tips would be appreciated. Thanks in advance