The American journal of gastroenterologySep 1, 2026

Do Patients Taking GLP-1 Medicines Need Longer Fasting Before Liver Stiffness Scans?

GLP-1 Therapies Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Sep 2, 2026

Abstract

Liver stiffness measurement (LSM) increased 20.6% at 30-60 minutes after meal ingestion in participants receiving GLP-1 receptor agonists.

Current fasting recommendations for vibration-controlled transient elastography may still be valid for most patients after a three-hour fast.
LSM returns to baseline in most patients within 3-4 hours post-meal.
In a small group, some participants required up to 4 hours for LSM to fully normalize after eating.
The study involved 23 participants, including 12 with cirrhosis, who received glucagon-like peptide-1 receptor agonists.

Simplified

Vibration-controlled transient elastography (VCTE) requires a three-hour fasting period to minimize postprandial increases in liver stiffness measurement (LSM), but this recommendation predates widespread use of glucagon-like peptide-1 receptor agonists (GLP-1-RAs), which alter gastric emptying and postprandial hemodynamics. We evaluated whether current fasting guidance remains valid in 23 participants, including 12 with cirrhosis, receiving GLP-1 RAs who underwent serial LSM following standardized meal ingestion. LSM increased 20.6% at 30-60 minutes but fell back to <10% by 3 hours. Most patients returned to baseline by 3-4 hours, supporting adequacy of a three-hour fast, however, some patients required 4 hours for full return to baseline.

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Do Patients Taking GLP-1 Medicines Need Longer Fasting Before Liver Stiffness Scans?

Abstract

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