How long is the stimulus applied in a vibroacoustic stimulation test?

In a vibroacoustic stimulation test, the appropriate duration for applying the stimulus is 1 to 3 seconds. This brief exposure helps to elicit a fetal response effectively without causing undue stress to the fetus. The goal of this test is to assess fetal well-being by stimulating the fetus to move or respond, typically in cases where there is concern about fetal activity.

While longer durations might seem like they could enhance the response, they are not necessary and could potentially cause the fetus to become desensitized to the stimulus. The time frame of 1 to 3 seconds strikes the right balance to evaluate fetal reactivity in a timely and effective manner, which is why this period is standard practice in the vibroacoustic stimulation procedure.