How Is Achalasia Diagnosed? Tests, Criteria & Process
Achalasia diagnosis relies on Upper endoscopy (OGD) with biopsy, Colonoscopy with biopsy, Liver function tests (ALT, AST, ALP, GGT, bilirubin, albumin). Learn the full diagnostic pathway, clinical criteria, differential workup, and what to expect at your evaluation.
Updated March 27, 2026
Achalasia is diagnosed using Upper endoscopy (OGD) with biopsy, Colonoscopy with biopsy, Liver function tests (ALT, AST, ALP, GGT, bilirubin, albumin) and targeted clinical evaluation. Achalasia is a motility disorder where the lower esophageal sphincter fails to relax and esophageal peristalsis is absent, causing progressive dysphagia to both solids and liquids, regurgitation, and weight loss. Treatment includes pneumatic dilation or surgical myotomy.
Clinical Context
The diagnostic process for Achalasia begins with Clinical history and LFTs, followed by ultrasound and endoscopy based on presentation and symptom localisation. Key investigations include Upper endoscopy (OGD) with biopsy, Colonoscopy with biopsy, Liver function tests (ALT, AST, ALP, GGT, bilirubin, albumin), Abdominal ultrasound. The gold standard is: Endoscopy with histopathology for luminal disease; liver biopsy for parenchymal staging; cross-sectional imaging for mass lesions. Clinical guidelines from BSG / EASL / AGA / ACG define the diagnostic criteria and recommended investigation pathway.
Clinical Pathway
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How Is Achalasia Diagnosed? Tests, Criteria & Process?+
Achalasia is diagnosed using Upper endoscopy (OGD) with biopsy, Colonoscopy with biopsy, Liver function tests (ALT, AST, ALP, GGT, bilirubin, albumin) and targeted clinical evaluation. Achalasia is a motility disorder where the lower esophageal sphincter fails to relax and esophageal peristalsis is absent, causing progressive dysphagia to both solids and liquids, regurgitation, and weight loss. Treatment includes pneumatic dilation or surgical myotomy.
How do doctors test for achalasia?+
The main tests used to diagnose Achalasia include Upper endoscopy (OGD) with biopsy, Colonoscopy with biopsy, Liver function tests (ALT, AST, ALP, GGT, bilirubin, albumin). Your doctor will select investigations based on your symptoms, clinical findings, and risk factors.
How long does it take to diagnose Achalasia?+
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 Achalasia be missed on initial testing?+
Yes — Achalasia 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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