nitrogen washout test

nitrogen washout test
(for functional residual capacity of lungs) with the patient inhaling pure oxygen, the concentration of exhaled nitrogen is obtained for each breath until it falls below 1 per cent of the gas being exhaled (usually about seven minutes' time); the total volume of nitrogen that has been exhaled at this point is assumed to be 0.8 of the functional residual capacity.

Medical dictionary. 2011.

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