Which method below is used to determine a person’s body fat by using an instrument that emits a small dose of radiation to measure the amount of fat, lean tissue, and bone in an individual?

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We begin by restating the question and listing the options to ensure clarity about what is being evaluated.
Question: Which method below is used to determine a person’s body fat by using an instrument that emits a small dose of radiation to measure the amount of fat, lean tissue, and bone in an individual?
Answer options: [Underwater weighing, Bioelectrical impedance, DEXA, Anthropometrics, Caliper calculation]

Now, let's analyze each option in turn:

Option 1: Underwater weighing. This method determines body density by comparing weight in air to weight underwater, using water displacement. It does not involve radiation or an instrument that emits radiation. Therefore, it does not fit the description of using a device that emits a small dose of radiation to assess fat, lean tissue, and bone.

Option 2: Bioelectrical impedance. This technique estimates body composition by sending a small electrical current through the body and measuring resistance. It is radiation-free and relies on electrical properties, not radiation-emitting instruments. Thus, it does not match the described method.

Option 3: DEXA. DEXA stands for dual-energy x-ray absorptiometry and uses a small dose of X-ray radiation to differentiate and quantify fat tissue, lean tissue, and bone mineral content. This aligns precisely with the description of an instrument that emits radiation to measure fat, lean tissue, and bone.

Option 4: Anthropometrics. This category includes measurements like height, weight, and circumferences. It does not involve radiation or imaging, and it does not provide direct measurement of fat, lean tissue, and bone via a radiation-emitting instrument.

Option 5: Caliper calculation. Skinfold calipers estimate subcutaneous fat by measuring skinfold thickness, but there is no radiation involved and it doesn’t use an instrument that emits radiation to assess fat, lean tissue, and bone.

In summary, the option that matches the description—emitting a small dose of radiation to assess fat, lean tissue, and bone—is the one involving dual-energy X-ray absorption, i.e., DEXA. The other methods rely on water displacement, electrical properties, or anthropometric measurements and do not use radiation-emitting instruments for this purpose.

Which method below is used to determine a person’s body fat by using an instrument that emits a small dose of radiation to measure the amount of fat, lean tissue, and bone in an individual?

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