**1.7 Evaluation of lab findings**

For the acute sinusitis no laboratory tests are recommended in emergency departments because for the acute sinusitis diagnosis is clinically. For the diagnosis of maxillary, frontal, sphenoid sinusitis plain sinus X-ray is most accurate. In contrast plain X-ray is not suitable for the evaluation of ostiomeatal complex or anterior ethmoid cells, which are the originating cell for sino nasal diseases. Positive lab test on plain films for sinusitis shows air-fluid levels, mucosal thickening of 6 mm or even more, sinus opacity. The choice of diagnostic test for sinusitis is the coronal CT at a thickness of 3–4 mm. Clinical findings of CT are sinus wall displacement, air-fluid levels, sinus opacification, 4 mm or more mucosal thickening. For the chronic bacterial and fungal sinusitis choice of diagnostic test is culture and biopsy [9].
