What are signs of a uti in a 17m old girl? if she has one, do i need to get her in to see a doctor or can i treat it at home? if so, how?

Same as an adult: Signs of a UTI include: burning and or pain with urination, frequent urination, urgent need to go, and difficult to start urinating. Also can include fever, abdominal pain, and vomiting and back pain. If you suspec this you should see your doctor for a urine culture.

See doctor: Should see doctor. You do not want to damage kidneys. Urine culture will make sure proper organism treated. Many times in this age there are issues with reflux from the bladder to kidneys which can affect function of kidneys. Severity and number of infections also enter into workup and diagnosis. Sometimes VCUG (fluoroscopic bladder study) and ultrasound of kidneys may need to be performed.