A client is undergoing a bioelectrical impedance test to estimate body fat. The nurse will explain to the client that this test involves:
A) Not eating anything after midnight and walking/running on a treadmill
B) Measuring skin fold thicknesses in a number of different sites on the body
C) Taking quantitative pictures to determine the thickness of the body fat
D) Using electrodes to send harmless current through the body to measure resistance to estimate body fat
Ans: D
Feedback:
Bioelectrical impedance involves the use of electrodes attached to the wrists and ankles to send a harmless current through the body. The flow of the current is affected by the amount of water in the body. Because fat-free tissue contains virtually all the water and current-conducting electrolytes, measurements of the resistance (i.e., impedance) can be used to estimate the percentage of body fat present. Computed tomography and MRI can be used to provide quantitative pictures from which the thickness of fat can be determined. Measurements of skinfold thickness can provide a reasonable assessment of body fat, particularly if taken at multiple sites.
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