F Fu un nc ct ti io on na al l r re es si id du ua al l c ca ap pa ac ci it ty y i in n h he ea al lt th hy y p pr re es sc ch ho oo ol l c ch hi il ld dr re en n A mass-produced closed-circuit helium dilution device (rolling seal) was used. Selection of the 113 healthy children (from the 571 measured) was based on an extensive personal and family history questionnaire and on clinical examination before measurements were performed.With three successive attempts it was possible to achieve at least two reproducible measurements in 73% of the children (repeatability coefficient 95.3 mL). Reliable functional residual capacity measurements can be routinely performed in preschool children with a mass-produced device. Reference values were collected for children 95-125 cm in height.
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