The proper way of taking orthostatic measurements is to record blood pressure and heart rate when supine (lying down), then having the patient sit up, wait 2 minutes, then record again. Finally, the patient is then asked to stand up, wait another 2 minutes, then record again. A drop in systolic blood pressure > 20 mm Hg, diastolic blood pressure > 10 mm Hg, or a rise in heart rate > 10 beats per minute would indicate a positive test.
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