Once you visit your doctor, they’ll normally ask how long you’ve had symptoms. If you’re between age 15 and 25, your doctor might also ask if you’ve been in contact with any individuals who have mono. Age is one of the main factors for diagnosing mono along with the most common symptoms: fever, sore throat, and swollen glands.
Your doctor will take your temperature and check the glands in your neck, armpits, and groin. Your doctor might also check the upper left part of your stomach to determine if your spleen is enlarged.
Complete blood count
Sometimes your doctor will request a complete blood count. This blood test will help your doctor determine how severe your illness is by looking at your levels of various blood cells. For example, a high lymphocyte count often indicates an infection such as mono.
White blood cell count
A mono infection typically causes your body to produce more white blood cells as it tries to defend itself. A high white blood cell count can’t confirm an infection with EBV, but the result suggests that it’s a strong possibility.