Which test is described by the acronym H.G.N.?

Which test is described by the acronym H.G.N.?

• A. Nystagmus test for head tilting
• B. Blood pressure check
• C. Horizontal Gaze Nystagmus (a test for detecting drug/alcohol use)
• D. House

Answer: (C)

Horizontal Gaze Nystagmus is a field sobriety test that looks for involuntary eye jerking when a person follows a moving object with their eyes. When someone has been drinking or using certain drugs, the eyes tend to jerk more easily and at earlier angles, especially as the gaze moves toward the side. In practice, the test has the person track a moving target horizontally, and the observer notes signs like the eyes not smoothly following the target and noticeable jerking at or before the far edge of gaze. These clues help indicate impairment, though they aren’t definitive on their own and are used alongside other observations and tests. Other options don’t fit this acronym or purpose: a blood pressure check measures cardiovascular status, a head-tilting nystagmus test isn’t the standard HGN procedure, and “House” is unrelated.

Horizontal Gaze Nystagmus is a field sobriety test that looks for involuntary eye jerking when a person follows a moving object with their eyes. When someone has been drinking or using certain drugs, the eyes tend to jerk more easily and at earlier angles, especially as the gaze moves toward the side. In practice, the test has the person track a moving target horizontally, and the observer notes signs like the eyes not smoothly following the target and noticeable jerking at or before the far edge of gaze. These clues help indicate impairment, though they aren’t definitive on their own and are used alongside other observations and tests.

Other options don’t fit this acronym or purpose: a blood pressure check measures cardiovascular status, a head-tilting nystagmus test isn’t the standard HGN procedure, and “House” is unrelated.