Table 1

Representative values of functional residual capacity at arbitrary chosen values of length and body weight in infants from collated data 34

Length cm5060708090
FRCHe mL72114168236318
95% Cl mL51–10281–161119–237166–333226–448
  • FRCHe: Functional residual capacity by helium

  • CI: confidence interval

  • Each individual laboratory should attempt to study at least some healthy infants to check whether available reference data are appropriate for their population. Regular checks should also be made to ensure that the equipment produces appropriate values during in vitro assessment over the full range of lung volumes likely to be encountered during studies.