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Sodium concentration is measured by either indirect (INa) or direct potentiometry (DNa), on chemistry and gas panels, respectively. A spurious difference between these methods (ΔNa=INa-DNa) can be confusing to the clinician. For example, variation in serum total protein (TP) is well known to selectively interfere with INa. Red cells have been suggested to interfere with DNa, but both positive and negative interference have been reported. In this study, the effect of gas panel hemoglobin (Hb) on ΔNa was examined.
PMID: 28065682 [PubMed - as supplied by publisher]