How Is Chronic Sinusitis Diagnosed? Tests, Criteria & Process
Chronic Sinusitis diagnosis relies on Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis. Learn the full diagnostic pathway, clinical criteria, differential workup, and what to expect at your evaluation.
Updated March 27, 2026
Chronic Sinusitis is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Chronic sinusitis is sinus inflammation lasting more than 12 weeks, causing nasal congestion, facial pressure, postnasal drip, and reduced sense of smell. It is subdivided into forms with and without nasal polyps; treatment includes nasal steroids, saline irrigation, and sometimes surgery.
Clinical Context
The diagnostic process for Chronic Sinusitis begins with Thorough history and physical examination followed by basic blood and urine tests; targeted specialist investigation as needed. Key investigations include Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis, Chest X-ray. The gold standard is: Directed investigation based on clinical history and physical examination findings. Clinical guidelines from NICE / BMJ Best Practice / WHO define the diagnostic criteria and recommended investigation pathway.
Clinical Pathway
Chronic Sinusitis — Full Condition GuideCondition HubChronic Sinusitis — Differential DiagnosisDifferentialChronic Sinusitis — Treatment PathwaysTreatmentChronic Sinusitis — Prognosis & OutlookPrognosisFrequently Asked Questions
How Is Chronic Sinusitis Diagnosed? Tests, Criteria & Process?+
Chronic Sinusitis is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Chronic sinusitis is sinus inflammation lasting more than 12 weeks, causing nasal congestion, facial pressure, postnasal drip, and reduced sense of smell. It is subdivided into forms with and without nasal polyps; treatment includes nasal steroids, saline irrigation, and sometimes surgery.
How do doctors test for chronic sinusitis?+
The main tests used to diagnose Chronic Sinusitis include Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis. Your doctor will select investigations based on your symptoms, clinical findings, and risk factors.
How long does it take to diagnose Chronic Sinusitis?+
The time to diagnosis varies. Some cases are identified within hours using clinical presentation and blood tests; others require weeks, repeated investigations, or specialist referral.
Can Chronic Sinusitis be missed on initial testing?+
Yes — Chronic Sinusitis can be missed if initial tests are negative or if the presentation is atypical. If clinical suspicion remains high, repeat testing or specialist referral is appropriate.
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