Inflammatory Bowel Disease (IBD) is a chronic, recurrent condition marked by disturbed levels of various hematological inflammatory cells and a deregulated immune environment. While C-reactive protein (CRP) is a key acute-phase reactant, its high levels can persist even after inflammation subsides. Other simple, cost-effective ratios, such as the Neutrophil-to-Lymphocyte Ratio (NLR), the Platelet-to-Lymphocyte Ratio (PLR), and Albumin-related ratios, also serve as promising, reproducible markers of systemic inflammation reflecting both immune status and nutrition. This study's objective is to evaluate the diagnostic performance of these various hematological inflammatory cellular components and CRP-related ratios (like the CAR) as predictors for Ulcerative Colitis (UC) disease severity, using colonoscopic and microscopic findings as the gold standard for comparison.

Inclusion Criteria:

• Patients who fulfilled the diagnostic criteria for UC;
• Patients were free of exclusion criteria;
• Patients who signed the written consent were enrolled in the study

Exclusion Criteria:

• Patients who was Previously diagnosed with IBD or IBS;
• Patients with recurrence of manifestations after surgical resection;
• Patients who refused to sign the participation consent.

The study population consisted of all patients exhibiting clinical signs suggestive of Inflammatory Bowel Disease were assessed for Ulcerative Colitis diagnostic criteria.