The evaluation of periorbital cellulitis begins with a history and physical exam, including an eye examination.

Physical findings in someone with periorbital cellulitis may include:

• Abnormal motion of the eye
• Redness of the skin around the eye
• Swelling of the skin around the eye
• Tenderness of the skin around the eye

Tests that may be used to evaluate periorbital cellulitis include:

• Complete blood count
• Blood antistreptolysin O (ASO titer) titers
• Blood cultures
• CT scan of the head and orbits
• MRI scan of the head and orbits
• X-rays of the orbits
• Spinal tap