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Foundation models designed for tabular data may enable accurate prediction while preserving interpretability, but their application in early AKI risk assessment has not been fully explored.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To develop and externally validate an interpretable early prediction model for AKI using the Tabular Prior-data Fitted Network (TabPFN) based on routinely available admission data.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>In this retrospective cohort study, predictors were restricted to clinical variables recorded within the 24\u00a0h prior to hospital admission, and this temporal definition was applied consistently across both the internal cohort and the external MIMIC-IV validation dataset. Time zero was defined as the admission time. Baseline serum creatinine (SCr) was defined as the first creatinine measurement at admission. The primary outcome was in-hospital AKI, defined according to KDIGO SCr criteria as a subsequent rise in creatinine relative to this admission baseline at any time during the index hospitalization. A total of 44,324 patients were included in the development cohort. TabPFN was trained on a stratified subsample and evaluated on a held-out internal test set, and benchmarked against seven conventional machine-learning models. Missing data were handled using multivariate imputation, and model interpretation was performed using SHAP-based attribution analyses. External validation was conducted in the MIMIC-IV database following predefined inclusion criteria and feature harmonization.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>In the internal test set, TabPFN achieved an AUROC of 0.953, outperforming comparator models. External validation demonstrated robust discrimination with an AUROC of 0.859. Calibration analyses indicated good agreement between predicted and observed risks. Attribution analyses identified baseline renal function and acute illness markers as major contributors to model-attributed AKI risk, with heterogeneous association patterns across patient subgroups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Using routinely available pre-admission data, TabPFN enabled accurate early prediction of in-hospital AKI and provided interpretable risk attribution patterns. These findings suggest potential utility for early risk stratification; however, results are observational and hypothesis-generating, and prospective validation is required before clinical deployment.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12911-026-03561-7","type":"journal-article","created":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T06:05:12Z","timestamp":1778565912000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Development and external validation of an interpretable early prediction model for acute kidney injury using TabPFN and routine admission data: a retrospective cohort study"],"prefix":"10.1186","volume":"26","author":[{"given":"Zheng","family":"Xu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenyu","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Guan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingyu","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinyuan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siqi","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ningxin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minghao","family":"Gu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanlu","family":"Xin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,12]]},"reference":[{"issue":"10474","key":"3561_CR1","doi-asserted-by":"publisher","first-page":"241","DOI":"10.1016\/S0140-6736(24)02385-7","volume":"405","author":"M Ostermann","year":"2025","unstructured":"Ostermann M, Lumlertgul N, Jeong R, See E, Joannidis M, James M. 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QYFY WZLL 3d89; approved on 9 June 2025). The study was conducted in accordance with the Declaration of Helsinki and relevant institutional requirements. Given the retrospective nature of the study and the use of de-identified data, the requirement for informed consent was waived by the IRB. The external validation cohort was derived from the publicly available MIMIC-IV database. 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