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Fick technique

Numerator is oxygen consumption (O2 absorbed by lungs in mL/minute).

Indicator-dilution technique

Denominator is the sum of contrast agent concentrations (C) at each time interval (t).

Thermodilution technique

TB – TI is the difference between body and injectate temperatures; injectate is usually dextrose or saline. Denominator is the sum of changes in temperature at each time interval (t).