 CT scan and MRI of the orbits are two imaging modalities that are commonly used to aid in the diagnosis and monitoring of orbital cellulitis, as they can provide detailed images that can show the extent of inflammation along with possible abscess location, size, and involvement of surrounding structures.Ultrasound has also been used as an imaging modality in the past, but it cannot provide the same level of detail as CT or MRI.Blood cultures, electrolytes, and a complete blood count (CBC) with differential showing elevated white blood cell count is a useful laboratory test that may aid in diagnosis.