The provided UK guideline excerpts do not explicitly specify indications for urgent referral to ENT for a patient presenting with stridor in a primary care setting.
However, the guidelines do outline criteria for referral related to other head and neck symptoms. For adults aged 45 and over with persistent and unexplained hoarseness, a suspected cancer pathway referral for laryngeal cancer should be considered NICE NG12. Other indications for ENT referral, as detailed in the provided context, relate to hearing loss, ear pain, discharge, and abnormal ear appearances, but these are not associated with stridor NICE NG98.