The normal range for a blood pressure measurement is below 120/80; the first number represents systolic blood pressure, which is the pressure in the arteries as the heart contracts, and the second number represents diastolic blood pressure, or the pressure in the arteries as the heart relaxes after the contractionA measurement between 120/80 and 139/89 is considered �pre-hypertension,� and blood pressure of 140/90 or above is considered high blood pressure. Recent studies show that in adults ages 40�89, the risk of death from heart disease and stroke begins to rise at blood pressures as low as 115/75. Consistent high blood pressure increases the risk of congestive heart failure, and can lead to other problems such as eye damage, heart enlargement or failure, and kidney damage and failure. (taken from medical website)
Hope that helps. :o)