Which Clotting Test Best Predicts Death in Critically Ill Children? A Landmark Study Weighs Five Competing Criteria

Disseminated intravascular coagulation, or DIC, is one of the most feared complications in intensive care medicine. In this disorder, the body’s finely tuned clotting system spirals out of control: widespread activation of coagulation cascades consumes platelets and clotting factors faster than they can be replenished, while the resulting microthrombi choke off blood flow to organs and, paradoxically, the depletion of clotting material opens the door to dangerous bleeding. For children in the pediatric intensive care unit, the condition is strongly associated with multiorgan dysfunction and death, yet clinicians have never agreed on a single, universally accepted way to diagnose it. A new observational cohort study published in Pediatric Research by Jiao Chen, Xiuxiu Li, Yuxiao Sun, Yanbing Fu, Hongmei Chen and colleagues now offers the most systematic head-to-head comparison to date of five competing diagnostic frameworks, and its conclusions may reshape how pediatric intensivists screen for this life-threatening syndrome.

The research team set out to answer a deceptively simple question: when the same critically ill child is assessed with different diagnostic criteria, does the label of DIC change, and does any particular scoring system do a better job of predicting which children will die? This question matters because the major diagnostic frameworks were developed in different eras, for different populations, and with different laboratory variables. The International Society on Thrombosis and Haemostasis overt DIC score, first proposed in 2001 and updated in 2021 and again in 2025, relies on routine coagulation tests such as platelet count, fibrin-related markers, prothrombin time and fibrinogen. The sepsis-induced coagulopathy score, or SIC, was designed as an earlier-warning system for the coagulopathy that precedes overt DIC in sepsis, while the Chinese DIC Scoring System emerged from multicenter studies of critically ill patients in China and incorporates a broader panel of hemostatic markers.

Using a cohort of 2,015 critically ill children, the investigators applied all five criteria to every patient and tracked how often each one flagged DIC, how well the different labels agreed with one another, and how strongly a positive diagnosis correlated with pediatric intensive care unit mortality. The results revealed a striking degree of divergence. Depending on which scoring system was used, the proportion of children classified as having DIC varied substantially, with the SIC-ISTH criteria consistently identifying the highest proportion of cases. In practical terms, this means that the same blood samples from the same children can yield dramatically different epidemiological pictures of DIC depending on the diagnostic lens applied, a finding that helps explain why published incidence rates for pediatric DIC have ranged so widely across the literature.

Agreement analysis added an important layer of nuance. The researchers found excellent agreement between the 2021 and 2025 versions of the DIC-ISTH criteria, suggesting that the recent international update did not fundamentally alter which children are classified as having overt DIC. Even more striking was the near-perfect agreement between the SIC-ISTH and SIC-China criteria, two scoring systems developed independently on different continents, and this consistency held across every clinical subgroup the team examined. For clinicians, this convergence is reassuring: it implies that the sepsis-induced coagulopathy concept is robust and that its two operational definitions are capturing essentially the same underlying physiological state, regardless of which side of the Pacific the score was calibrated on.

The prognostic performance of the criteria diverged sharply by clinical subgroup, and this is where the study delivers its most actionable message. Among children with sepsis, the SIC criteria outperformed the DIC criteria, showing both a higher area under the receiver operating characteristic curve and greater sensitivity for predicting PICU mortality. This finding fits the underlying biology: sepsis-induced coagulopathy is conceived as an early, still-compensated stage of the coagulation response to infection, and the SIC score was explicitly designed to catch this pre-overt phase before the full-blown consumptive coagulopathy of DIC takes hold. In septic children, catching the process early appears to translate directly into better discrimination between those who will survive and those who will not.

Among children with hematologic malignancies, however, the picture changed. In this subgroup, mortality rates and the sensitivity of mortality discrimination were comparable between the SIC and DIC criteria. This makes physiological sense as well, because children with leukemia and other blood cancers often have baseline abnormalities in platelet counts and coagulation parameters from their disease or its treatment, blurring the distinction between an early coagulopathy and established overt DIC. The finding suggests that for oncology patients, the traditional DIC scores retain their value and that a single sepsis-oriented screening tool cannot simply be transplanted across all critically ill populations without losing diagnostic precision.

Weaving these threads together, the authors arrived at a pragmatic recommendation: a combination of the SIC-ISTH criteria and the DIC-ISTH criteria should be used to screen for overt DIC in critically ill pediatric patients. The logic is a two-step screening strategy in which the highly sensitive SIC score serves as an early alarm for coagulopathy, particularly in septic children, while the DIC-ISTH framework confirms which of those children have progressed to overt DIC. This layered approach mirrors proposals in adult critical care, where experts have increasingly advocated sequential diagnosis of sepsis-associated coagulopathy, but the new study is among the first to validate such a strategy specifically in a large, heterogeneous pediatric cohort that includes both sepsis and hematologic malignancy subgroups.

The study also addresses a critical gap in pediatric critical care research more broadly. Diagnostic criteria for DIC were largely developed and validated in adults, and their pediatric applicability has long been uncertain because children differ from adults in baseline platelet counts, fibrinogen levels and the etiologies of critical illness. By systematically evaluating five established frameworks in more than two thousand children and reporting results across clinical subgroups, the researchers have given the field its clearest evidence yet about which tools transfer to pediatric practice and which do not. The work was funded by the National Natural Science Foundation of China and the Jiangsu Province Science and Technology Support Program, and the authors report no competing interests.

For the practicing intensivist, the immediate implications are concrete. Measuring the components of the SIC score in every septic child admitted to the PICU could identify, at an earlier stage, the subset at highest risk of progressing to overt DIC and death, creating a window for closer monitoring and earlier hemostatic intervention. At the same time, the substantial variation in incidence across criteria serves as a caution for researchers and guideline writers: any statement about how common DIC is in critically ill children is meaningless without specifying which diagnostic definition was used. As international societies continue to refine their definitions, as they did with the 2025 ISTH update, studies like this one provide the pediatric evidence base needed to ensure that those definitions actually work for the smallest and most vulnerable patients in the intensive care unit.

Beyond the immediate clinical takeaways, the study highlights a broader trend in critical care research: the recognition that coagulopathy is not a binary state but a dynamic continuum, evolving from subtle activation through compensated coagulopathy to full-blown consumptive DIC. The near-perfect agreement between the two SIC frameworks and the strong performance of early-warning scores in sepsis reinforce the idea that the most valuable diagnostic information often lies in the earliest, most treatable phase of the process. For children, whose physiological reserves are small and whose diseases progress quickly, that shift in focus from late confirmation to early detection could ultimately matter more than any single laboratory cutoff, and the combined SIC and DIC-ISTH screening strategy proposed by this study offers a practical roadmap for putting that principle into everyday pediatric practice.

Subject of Research: Comparison of five diagnostic criteria for disseminated intravascular coagulation in critically ill children

Article Title: Comparison of diagnostic criteria for disseminated intravascular coagulation in critically ill children

Article References: Chen, J., Li, X., Sun, Y., Fu, Y., & Chen, H. (2026). Comparison of diagnostic criteria for disseminated intravascular coagulation in critically ill children. Pediatric Research. https://doi.org/10.1038/s41390-026-05394-6

Image Credits: AI Generated

DOI: 10.1038/s41390-026-05394-6

Keywords: disseminated intravascular coagulation, pediatric intensive care, sepsis-induced coagulopathy, ISTH criteria, SIC score, hematologic malignancies, PICU mortality, diagnostic criteria, coagulopathy, critical care, pediatric research, screening strategy