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Updated: Aug 10, 2026

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Hemoglobin and hematocrit levels in the prediction of complicated Crohn's disease behavior--a cohort study
Florian Rieder1, Gisela Paul2, Elisabeth Schnoy2
1Department of Internal Medicine I, University of Regensburg, Regensburg, Germany; Department of Pathobiology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio, United States of America; Department of Gastroenterology, Hepatology & Nutrition, Cleveland Clinic, Cleveland, Ohio, United States of America.
Insights
Low hemoglobin (Hgb) and hematocrit (Hct) levels in Crohn's disease (CD) patients predict complications and surgery. Monitoring these blood markers can help identify at-risk individuals for earlier intervention.
Area of Science:
- Gastroenterology
- Internal Medicine
- Clinical Research
Background:
- Crohn's disease (CD) management benefits from predicting complicated disease behavior.
- Identifying at-risk patients allows for more aggressive therapeutic strategies.
Purpose of the Study:
- To evaluate hemoglobin (Hgb) and hematocrit (Hct) blood levels as predictors of complicated CD behavior and CD-related surgery.
- To assess the predictive value of Hgb and Hct in an adult CD patient cohort.
Main Methods:
- A cohort study of 62 adult CD patients from the German Inflammatory Bowel Disease network (Kompetenznetz CED).
- Blood samples for Hgb and Hct levels were analyzed prior to disease complications or surgery.
- Kaplan-Meier survival analysis and COX-proportional hazard regression models were used to analyze the relationship between markers and clinical events.
Main Results:
- 34% of patients developed complications or required surgery during a median follow-up of 55.8 months.
- Low Hgb or Hct levels independently predicted a shorter time to the first complication or CD-related surgery.
- Stable low Hgb/Hct levels correlated with a higher frequency of complications compared to stable normal levels.
Conclusions:
- Hemoglobin and hematocrit levels can serve as additional predictive tools for complicated disease behavior in CD patients.
- Measurement of Hgb and Hct in patients without prior complications or surgery may aid in risk stratification.
Background:
Markers that predict the occurrence of a complicated disease behavior in patients with Crohn's disease (CD) can permit a more aggressive therapeutic regimen for patients at risk. The aim of this cohort study was to test the blood levels of hemoglobin (Hgb) and hematocrit (Hct) for the prediction of complicated CD behavior and CD related surgery in an adult patient population.
Methods:
Blood samples of 62 CD patients of the German Inflammatory Bowel Disease-network "Kompetenznetz CED" were tested for the levels of Hgb and Hct prior to the occurrence of complicated disease behavior or CD related surgery. The relation of these markers and clinical events was studied using Kaplan-Meier survival analysis and adjusted COX-proportional hazard regression models.
Results:
The median follow-up time was 55.8 months. Of the 62 CD patients without any previous complication or surgery 34% developed a complication and/or underwent CD related surgery. Low Hgb or Hct levels were independent predictors of a shorter time to occurrence of the first complication or CD related surgery. This was true for early as well as late occurring complications. Stable low Hgb or Hct during serial follow-up measurements had a higher frequency of complications compared to patients with a stable normal Hgb or Hct, respectively.
Conclusions:
Determination of Hgb or Hct in complication and surgery naïve CD patients might serve as an additional tool for the prediction of complicated disease behavior.
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