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Evaluating the Effect of Body Mass Index on Procalcitonin Level in Patients with Pneumonia: A Retrospective Cross-Sectional Study

Mohammad Z Khrais, J. C. Henson, Jake Smith, N. Meena

Advances in Respiratory Medicine, 2025

18,652 participants

Abstract

Highlights What are the main findings? Body mass index (BMI) has a statistically significant effect on serum procalcitonin (PCT) levels in hospitalized patients with pneumonia. Higher BMI patients exhibited significantly lower PCT levels compared to patients with lower BMI. What is the implication of the main finding? The findings suggest that individuals with higher BMI might exhibit either a less robust immune response or increased PCT clearance. Consideration of BMI-adjusted PCT reference ranges could enhance diagnostic accuracy, though further research is needed to validate this approach. Abstract Procalcitonin (PCT) is commonly used to evaluate the etiology and severity of pneumonia. PCT has been shown to be elevated at baseline in patients with obesity. The aim of this study is to determine if body mass index (BMI) has an influence on admission PCT level in patients admitted to the hospital with a diagnosis of pneumonia. We conducted a retrospective cohort study that encompassed patient visits to a tertiary care center from 2014 until September 2023. A total of 18,652 patients presented to the emergency department with a diagnosis of pneumonia. A total of 3659 were admitted to the floor, and 2246 were admitted to the MICU. Patients were grouped based on admission BMI into five categories. The Kruskal–Wallis test performed on patients admitted to the floor revealed a statistically significant difference in PCT levels among groups of different BMIs (H = 34.97, df = 4, p…

How strong is the evidence?

Evidence Hub reads this as a cross-sectional, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause. Reported size: 18,652 participants or records.

How the five levels of evidence work. The level is assigned automatically from the abstract and can be wrong, so check the paper.

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