Maximum systolic blood pressure (measured as a ratio of systolic to diastolic blood pressure)

What This Test Measures

Your blood pressure is recorded as two numbers: systolic (the pressure when your heart beats) and diastolic (the pressure when your heart rests between beats). This test calculates the ratio of your systolic to diastolic pressure, often used to evaluate blood pressure dynamics or rule out conditions like hypertension or hypotension.

Why It’s Done

Doctors may order this test if you have symptoms like dizziness, fatigue, or if they suspect an irregularity in your blood pressure readings. It can also be part of routine cardiovascular assessments or when monitoring conditions affecting blood pressure regulation.

How It’s Performed

This is not a standalone lab test but is typically derived from your blood pressure measurements taken during a standard physical exam. No special preparation is needed, and the process involves measuring your blood pressure twice (usually in both arms) while you sit quietly.

What to Expect

You’ll lie down or sit comfortably while a healthcare provider wraps a cuff around your arm. They’ll inflate the cuff to restrict blood flow and then slowly release it to measure your systolic and diastolic pressures. The ratio is calculated automatically from these readings.