Do you often wonder what your blood pressure numbers mean? Doctors call them systolic (the top number) and diastolic (the bottom number) blood pressure. Knowing both is important and could save.
Jan 17, 2012 · Q: How low is too low for the bottom blood pressure number, and how high is too high for the top one? My dad's numbers have been shifting somewhat. I'm calling his doc tomorrow for an appointment to see what's going on, but what's so high or low that I Author: Dr. Oz.
Normal blood pressure ranges from below 140 mm HG systolic and 70 to 90 mm HG diastolic. A high top number, or systolic number, and a low bottom, or diastolic, number indicates a condition called isolated systolic hypertension (IHS).