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Sources of error in neonatal blood sampling.
  1. H Patel,
  2. S W Ryan,
  3. B McLain
  1. Department of Paediatrics and Child Health, General Infirmary, Leeds.


    Significant underestimation of blood electrolyte concentrations may occur if less than 1 ml of blood is withdrawn from an indwelling arterial line before taking the sample for analysis. Compared with arterial samples capillary samples give significant overestimations of potassium concentration and carbon dioxide tension, and significant underestimation of oxygen tension.

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