title: Blood sampling through umbilical catheters.
abstract: An in vitro study testing the reliability of chemical determinations on blood samples withdrawn through an umbilical catheter is described. Blood samples were withdrawn through three different sizes of umbilical catheters containing a solution of dextrose, sodium bicarbonate, and potassium. Using either a 5 French or a 3 1/2 French catheter, accurate results were obtained for pH, sodium, potassium, and glucose when measurements were made after an initial 4-ml blood sample was discarded. With an 8 French catheter, accurate results were obtained for pH, sodium, and potassium but plasma glucose determinations remained inaccurate after 6 ml of blood was discarded.
mesh_terms: D001769:Blood; D001786:Blood Glucose / Q000032:analysis; D001793:Blood Preservation; D001800:Blood Specimen Collection / Q000379:methods*; D002404:Catheterization; D006493:Heparin; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007231:Infant, Newborn; D011188:Potassium / Q000097:blood; D012964:Sodium / Q000097:blood; D014471:Umbilical Veins
chemical_list: D001786:Blood Glucose; D006493:Heparin; D012964:Sodium; D011188:Potassium