no. the drainage from the sinuses is quickly contaminated from nasal mouth and throat germs so you cannot diagnose sinusitis by this method. sinusitis is typically diagnosed by an array of characteristic symptoms (sinus pressure pain) coupled with corresponding examination findings (tenderness decreased light with transillumination - shining a bright light into the sinus area in a darkened room) or by x-ray or ct scan findings. most cases of sinusitis are viral and will be self-limiting but some require antibiotics or allergy mangement. see your medical provider.
can a lab test be done on coughed up mucus to determine if i have a sinus infection? . 10 days of coughing up thick yellow mucus facial pain all around sinus . antihistimines and mucinex seem to just mask symptoms but don't take away