How Is Lichen Planus Diagnosed? Tests, Criteria & Process
Lichen Planus 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
Lichen Planus is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Lichen planus is an inflammatory condition affecting skin, mucous membranes, and nails, causing intensely itchy, flat-topped, purple papules. Oral lichen planus can cause erosive lesions; topical and systemic corticosteroids are used for treatment.
Clinical Context
The diagnostic process for Lichen Planus 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 Lichen Planus Diagnosed? Tests, Criteria & Process?+
Lichen Planus is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Lichen planus is an inflammatory condition affecting skin, mucous membranes, and nails, causing intensely itchy, flat-topped, purple papules. Oral lichen planus can cause erosive lesions; topical and systemic corticosteroids are used for treatment.
How do doctors test for lichen planus?+
The main tests used to diagnose Lichen Planus 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 Lichen Planus?+
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 Lichen Planus be missed on initial testing?+
Yes — Lichen Planus 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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