A method for determining life that involves tying a finger and observing color change is known as what?

A method for determining life that involves tying a finger and observing color change is known as what?

• A. Ligature test
• B. Pulse oximetry
• C. Vitality test
• D. Autopsy

Answer: (A)

Testing life signs by observing tissue response to a constriction is what this method does. By tying a ligature around a finger and watching for a color change, you’re checking whether the circulation reacts in a living person. If life was present when the ligature was applied, the tissue will show a perceptible color change due to ongoing blood flow; if there was no life, the expected reaction won’t occur. Pulse oximetry uses a device to measure oxygen saturation, the vitality concept is broader and not tied to a specific constriction test, and autopsy is a postmortem examination. So the ligature test best matches the described approach.

Testing life signs by observing tissue response to a constriction is what this method does. By tying a ligature around a finger and watching for a color change, you’re checking whether the circulation reacts in a living person. If life was present when the ligature was applied, the tissue will show a perceptible color change due to ongoing blood flow; if there was no life, the expected reaction won’t occur. Pulse oximetry uses a device to measure oxygen saturation, the vitality concept is broader and not tied to a specific constriction test, and autopsy is a postmortem examination. So the ligature test best matches the described approach.