A normal white blood cell (WBC) count is 5.0-10.0 or 5,000-10,000. That being said, yours is obviously high, the causes for this can be many, however, the most common one is an infection, like a urinary tract infection, pneumonia, but left untreated can result in sepsis, or a blood infection. There are more serious causes to this though, best to discuss it with your doctor!
My white blood cell count 17.2 what does this mean and how high is in relation to being normal count?
White blood cells play a role in reducing inflammation in the body. A high white blood cell (WBC) count could mean that there is inflammation somewhere in the body, such as can occur in the gastrointestinal tract of people who have Inflammatory Bowel Disease.
Like the other answerer stated, yours is higher than normal. So yes, you may be at risk of an infection somewhere in your body.