ArticleFrontiers in medicine2026
Borderline liver enzyme patterns and their metabolic-inflammatory signatures: an observational outpatient study.
Article in Frontiers in medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background and aim: Liver enzyme elevations between one and two times the upper limit of normal (ULN) are common in outpatient practice and often dismissed as clinically insignificant, yet whether this range harbours meaningful subphenotypes, and whether the hepatocellular-cholestatic distinction applies at borderline levels, has not been systematically examined. We investigated whether, in adult outpatients with persistent borderline elevation confirmed using sex-specific ULN, the hepatocellular and cholestatic patterns carry distinct metabolic and inflammatory signatures. Materials and methods: This single-centre observational outpatient study was conducted at Elazığ Fethi Sekin City Hospital between October 2024 and January 2026. Eight hundred adults with standardised fasting biochemistry and haematology panels at baseline and third-month follow-up were analysed. Liver enzymes were classified as normal, borderline, or overtly elevated by the maximum fold-increase above the sex-specific ULN; borderline cases were subcategorised as hepatocellular, cholestatic, or overlap. Clinical, biochemical, inflammatory, and iron parameters were compared, and independent associations were examined using multivariable logistic regression. Results: Enzyme levels were normal in 548 patients (68.5%), borderline in 211 (26.4%), and overtly elevated in 41 (5.1%). Among the 211 borderline patients, 105 (49.8%) exhibited a hepatocellular pattern, 77 (36.5%) a cholestatic pattern, and 29 (13.7%) an overlap pattern. The hepatocellular pattern was associated with higher ferritin, serum iron, and transferrin saturation (TSAT), and a lower AST/ALT ratio; in multivariable analysis, ferritin was the only independent correlate (OR = 1.523; 95% CI: 1.199-1.935; Conclusion: Persistent borderline liver enzyme elevation can be stratified into biochemically distinct subphenotypes when sex-specific reference ranges are applied. The cholestatic pattern is predominantly associated with glycaemic burden, systemic inflammation, and reduced iron transport, whereas the hepatocellular pattern shows an iron-predominant signature. A pattern-based approach may carry clinical value in outpatient management; findings from full models with limited events-per-variable, particularly for SII, are hypothesis-generating and require longitudinal validation.
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