Background: ‘Iron deficiency is commonly observed in children with inflammatory bowel disease (IBD)’, primarily due to chronic inflammation, nutrient malabsorption, and gastrointestinal blood loss. Diagnosing iron deficiency in this population is challenging, particularly when corticosteroids, which alter inflammatory responses, are used to manage IBD symptoms. Conventional markers, such as hemoglobin and ferritin, can be affected by inflammation, potentially leading to diagnostic inaccuracies. This study evaluates the effectiveness of hematological and biochemical markers, including hemoglobin, serum ferritin, transferrin saturation, ‘soluble transferrin receptor (sTfR), and the ferritin index, in diagnosing iron deficiency’ in pediatric IBD patients. A key focus is on understanding how corticosteroid therapy influences the diagnostic reliability of these markers. Methods: Conducted at Pak International Medical College, Peshawar, this cross sectional study included 100 pediatric IBD patients, divided into groups based on iron status and corticosteroid use. Biochemical markers were measured, and ‘diagnostic performance was evaluated using sensitivity, specificity, positive and negative predictive values, and’ ROC analysis to determine each marker’s diagnostic accuracy. Results: sTfR and the ferritin index demonstrated high sensitivity and specificity, maintaining diagnostic accuracy even among corticosteroid-treated patients. In contrast, conventional markers like hemoglobin and serum ferritin were less reliable in the presence of corticosteroid-induced inflammation. ROC analysis revealed that sTfR and the ferritin index had the highest AUC values, supporting their use as dependable markers in inflammatory settings. Conclusion: The study concludes that sTfR and the ferritin index are effective markers for diagnosing iron deficiency in pediatric IBD patients, regardless of corticosteroid therapy. Implementing a multi-marker approach that includes these inflammation resistant markers can improve diagnostic accuracy, supporting timely and targeted treatment interventions. This approach is crucial for enhancing care and outcomes for pediatric IBD patients