How Is Cluster Headache Diagnosed? Tests, Criteria & Process
Cluster Headache 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
Cluster Headache is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Cluster headaches are one of the most painful conditions, causing severe unilateral pain around one eye, accompanied by tearing, nasal congestion, and restlessness. They occur in cyclical patterns (clusters) and respond to oxygen therapy and triptans.
Clinical Context
The diagnostic process for Cluster Headache 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
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How Is Cluster Headache Diagnosed? Tests, Criteria & Process?+
Cluster Headache is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Cluster headaches are one of the most painful conditions, causing severe unilateral pain around one eye, accompanied by tearing, nasal congestion, and restlessness. They occur in cyclical patterns (clusters) and respond to oxygen therapy and triptans.
How do doctors test for cluster headache?+
The main tests used to diagnose Cluster Headache 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 Cluster Headache?+
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 Cluster Headache be missed on initial testing?+
Yes — Cluster Headache 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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