What is the quick formula to estimate a child's systolic blood pressure?

• A. 70 + (2 x age)
• B. 80 + (3 x age)
• C. 60 + (4 x age)
• D. 90 + (2 x age)

Answer: (A)

A quick way to estimate a child’s systolic blood pressure is to use 70 plus 2 times their age in years. This simple rule provides a practical threshold in the field for children roughly 1 to 10 years old, so you can quickly screen for potential hypotension without needing precise cuff sizing or exact measurements. If the measured systolic BP falls below this value, it suggests possible shock or poor perfusion and should prompt urgent assessment and intervention. For older children, this rule becomes less precise, and you’d rely on actual measurements and age-appropriate norms instead, but the 70 + 2 × age formula is a commonly taught, fast screening tool in pediatric prehospital care.