How long must a variable deceleration last to be classified as such?

A variable deceleration is characterized by a temporary decrease in fetal heart rate due to umbilical cord compression, which can occur during contractions or fetal movements. To be classified as a variable deceleration, the decrease in heart rate must last for a specific duration.

The correct classification requires that the deceleration lasts at least 15 seconds but less than 2 minutes. This timeframe helps differentiate variable decelerations from other types of decelerations, ensuring that healthcare providers can accurately assess fetal well-being and respond appropriately.

In clinical practice, recognizing the duration and characteristics of fetal heart rate patterns, including variable decelerations, is crucial for monitoring fetal distress and guiding clinical decision-making during labor and delivery.