Determination of pH,PCO 2,PO 2,sodium and potassium in the same whole blood sample

Swaminathan R . Interference from heparin . … in the measurement of plasma sodium on ion selective electrodes. Ann Clin Biochem 1987; 24: 116–17.

Mann SW Green A . Reply to Interference from heparin … in the measurement of plasma sodium on ion selective electrodes. Ann Clin Biochem 1987; 24: 117.

Shek CC Swaminathan R . Errors due to heparin in the estimation of plasma sodium and potassium concentrations. Intensive Care Med 1985; 11: 309–11.

Mann SW Green A . Interference from heparin in commercial heparinised tubes in the measurement of plasma sodium by ion selective electrode: A note of caution. Ann Clin Biochem 1986; 23: 355–6.

Hutchison AS . Too much heparin: Possible source of error in blood gas analysis. Br Med J 1983; 287: 1131–2.