Which blood pressure measurement indicates a need for emergency care?

A blood pressure measurement of 160 or higher systolic or 100 or higher diastolic indicates a need for emergency care because these values are indicative of hypertensive crisis. In such cases, the individual is at an increased risk for severe health complications, including stroke, heart attack, and organ failure.

Normal blood pressure typically falls below 120/80 mmHg, with levels from 120-139 systolic considered elevated but not yet requiring immediate intervention. Measurements in the range of 140-159 systolic or 90-99 diastolic still indicate hypertension but usually can be managed with a doctor's intervention rather than requiring emergency care.

Thus, the threshold defined in the correct response reflects the need for urgent medical attention, as the risks associated with extremely high blood pressure can lead to acute and potentially life-threatening medical conditions.