The inflammatory bowel diseases represent a heterogeneous group of chronic , relapsing- inflammatory disorders of the gastrointestinal tract. Crohn's disease and ulcerative colitis are the two major clinical forms.The global incidence and prevalence of the inflammatory bowel diseases has increased over the last 2-4 decades . Despite the great progress in understanding the pathogenesis of these diseases, their etiology remains unclear . Considerable effort has been devoted to the development of an accurate ,noninvasive biomarkers that have increased diagnostic sensitivity and specificity .||Osteoprotegerin is a member of the Tumor Necrosis Factor Receptor superfamily of proteins. Osteoprotegerin is of particular importance in bone metabolism, inflammation , tumorigenesis, and other processes where cell differentiation, survival, and death are controlled. Osteoprotegerin activates inflammation in the gut by stimulating immune cells, cytokines, and the Necrosis factor-κappaB pathway .||Soluble Receptor activator of nuclear factor kappa-Β ligand is known as a type II membrane protein and as a member of tumor necrosis factor superfamily . Soluble Receptor activator of nuclear factor kappa-Β ligand has been identified to affect the immune system and a binding partner of ( Osteoprotegerin ), and controls cell proliferation.The interactions between Osteoprotegerin and Soluble Receptor activator of nuclear factor kappa-Β ligand, Soluble Receptor activator of nuclear factor kappa-Β have relevance to inflammatory pathways. Soluble Receptor activator of nuclear factor kappa-Β ligand- Soluble Receptor activator of nuclear factor kappa-Β ligand binding activates pathways that contribute to the survival of T-lymphocytes and dendritic cells .