If you know plasma volume and hematocrit of blood volume that is made up by cells total blood volume can be calculated. Measurement of body fluid compartments body fluid compartments can be measured by dilution of a compound that distributes only in the space of interest.
Fluid And Electrolyte Balance Basicmedical Key
Measurement of body fluid compartment volumes. This is estimated by measuring the volume of distribution of isotopes of water. The extracellular fluid compartment volume. 100 38 5645 ml. The fluid compartment volume. A known amount of a tracer is added to a compartment. To measure extracellular water volume the ideal indicator should distribute rapidly and uniformly outside the cells and should not enter the cell compartment.
22 measurement of compartment volumes 221 the dilution principle. The volume of a fluid compartment in the body can be measured by placing an indicator substance in the compartment allowing it to disperse evenly through out the compartments fluid and then analyzing the extent to which the substance becomes diluted. Measurement of body fluid compartment volumes the volumes of body fluid compartments are measured with a method based on the principle of dilution. The indicator dilution principle is based on the definition of a concentration. Body fluid compartments and measurement general physiology duration. Compartment volumes are measured by determining the volume of distribution of a tracer substance.
Total body water 30 012 ml d2o x 0001 ml d2oml water 29880 ml or 30 l therefore total body water as a percentage of body weight equals 50 in this woman. 3500 x 100. This volume is regulated by the movement of free water. Properties of the tracer and compartment measured blood volume versus plasma volume. Extracellular fluid 27 189 litres. Compartment volumes are measured by determining the volume of distribution of a tracer.
Intracellular fluid 33 231 litres. The tracer concentration in that compartment is measured after allowing sufficient time for uniform distribution throughout the compartment. 222 total body water. A marker substance is selected whose physical characteristics are such that it distributes only in the body fluid compartment whose volume you wish to calculate. This volume is regulated by the movement of sodium. The compartment volume is calculated as.
The everything else synovial fluid. For example isotopic water. If the amount of the substance is known and the resulting concentration is measured the volume can be calculated. Figure 254 shows this indicator dilution method of meas uring the volume of a fluid compartment which is based on the principle of conservation of mass.
Gallery of Measurement Of Body Fluid Compartment Volumes
