Fecal blood test positive. CBC is normal. Do I have cancer?

Further testing need. Fecal blood test is a screening test. When it is positive, then Colonoscopy examination is required to check for Colon Cancer. You need to get your Colon examined as you are over 50 year old(recommended for every one over 50 years of Age).
See below. There are many causes of blood in stool, colon cancer is just one. However, at your age, it would be prudent to get a colonoscopic examination. Consult this site for more info: http://www.webmd.boots.com/digestive-disorders/blood-in-stool-causes-and-diagnosis For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.