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  • Title: Blood sampling through umbilical catheters.
    Author: Brown DR, Fenton LJ, Tsang RC.
    Journal: Pediatrics; 1975 Feb; 55(2):257-60. PubMed ID: 235114.
    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    An in vitro study testing the reliability of chemical determinations on blood samples withdrawn through an umbilical catheter is described. Blood samples were withdrawn through three different sizes of umbilical catheters containing a solution of dextrose, sodium bicarbonate, and potassium.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.
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