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2 mL arterial or venous blood in a heparinised syringe. Ensure no air bubble is present, then mix thoroughly, label 'URGENT'. Must be analysed within 15 minutes. Analysed in Blood Gas Analyser.
Of value in investigating patients with cyanosis and a normal pO2.
Levels may be raised in congenital haemoglobin M disorders and drug toxicity associated with nitrites or other oxidising agents.
< 1.5 % of total haemoglobin
(levels may be higher in infants)
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