Pseudohyponatraemia due to hyperlipidaemia or hyperproteinaemia is seen when flame photometry or indirect potentiometry is used for measuring serum sodium concentrations, but not when direct potentiometry is used.' Pseudohyponatraemia secondary to hypertriglyceridaemia is well recognized.vl However, hypercholesterolaemia as a cause for pseudohyponatraemia is extremely uncommon. We now report a patient in which pseudohyponatraemia was associated with a high cholesterol concentration.
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Ko et al. (1997) studied this question.
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