Non-Invasive Liver Function Assessment Techniques
Summary
Assessment of liver function has been revolutionised by non-invasive approaches that avoid the risks and discomfort of biopsy. Broadly, these techniques fall into three categories: serological panels, imaging modalities and dynamic function tests. Serological panels combine routine biochemical markers to generate indices of fibrosis or synthetic capacity. Imaging modalities such as transient elastography and magnetic resonance elastography measure tissue stiffness, serving as surrogates for structural changes. Dynamic function tests evaluate metabolic reserve by tracking the conversion of exogenous labelled substrates over time, notably using stable carbon isotopes in breath tests or bile acid challenge assays. Recent work has demonstrated how these methods can stratify stages of chronic liver disease, monitor progression of non-alcoholic steatohepatitis and guide clinical decision-making across diverse patient populations. The global burden of liver disease and the need for repeat assessment underscore the practical value of these non-invasive tools in both specialist centres and resource-limited settings. Emerging trends include integrated diagnostic frameworks that combine multiple modalities to enhance accuracy and cost-effectiveness.
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Non-Invasive Liver Function Assessment Techniques publication trend
The graph below shows the total number of articles in non-invasive liver function assessment techniques across all publications each year (not limited to Nature Index journals).
Technical terms
Dynamic liver function test: An assay that quantifies hepatic metabolic capacity by measuring the kinetics of substrate metabolism over time.
13C-methacetin breath test (MBT): A dynamic test evaluating microsomal liver function through measurement of exhaled 13CO₂ following labelled methacetin ingestion.
13C-octanoate breath test (OBT): A dynamic test assessing mitochondrial β-oxidation by analysing 13CO₂ in breath after octanoate administration.
13C-aminopyrine breath test (ABT): An assay of microsomal enzyme activity, based on exhaled 13CO₂ following aminopyrine metabolism.
Dual oral cholate challenge test (DuO): A method quantifying bile acid handling and portal-systemic shunting via measurement of serum cholate clearance and derived indices.
Transient elastography: An ultrasound-based imaging technique that estimates liver stiffness as an indirect marker of fibrosis.
References
- A Comparison of 13C-Methacetin and 13C-Octanoate Breath Test for the Evaluation of Nonalcoholic Steatohepatitis. Journal of Clinical Medicine (2023).
- Non-Alcoholic Steatohepatitis Decreases Microsomal Liver Function in the Absence of Fibrosis. Biomedicines (2020).
- Cost-effectiveness of an oral cholate challenge test for the management of patients at risk for large esophageal varices. PLOS ONE (2024).
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