Blood Pressure Values

• Average blood pressure for a 15-year-old teenager is approximately 125/79 mmHg, but exact age, weight, height and gender must also be considered in determining ideal blood pressure.
  
  

Calculating BP

• That National Institute for Health considers a teen's blood pressure to be high if the reading is above the ninetieth percentile for height. Some doctors may use the body mass index (BMI) to calculate ideal blood pressure for anyone under the age of 18.
  
  

Normal Variations

• The blood pressure of teenagers can fluctuate greatly depending on hormonal changes throughout the day, the activity at the time and stress. Three high readings, on different days, in a row are needed to diagnose high blood pressure (hypertension).
  
  

Causes

• Teenagers can have secondary or essential hypertension. Secondary hypertension is caused by kidney or heart dysfunction. Essential hypertension has been linked to obesity, poor diet, decreased activity and family history.
  
  

Significance

• Hypertension in teens can continue into adulthood and lead to cardiac damage, hardening of the arteries, kidney damage and stroke.