Initial diagnostic steps for malabsorption typically include a complete blood count (CBC) and comprehensive metabolic panel. Following these, specific tests are conducted to measure the body's levels of essential nutrients commonly affected by malabsorption, such as iron, vitamin B12, folic acid, and vitamin D. To evaluate for fat malabsorption, a stool test is performed to detect the presence of steatorrhea. Blood tests for celiac disease antibodies are also routinely considered. Further stool analysis may include testing for fecal elastase to assess for pancreatic enzyme insufficiency and fecal calprotectin to screen for inflammatory bowel disease. When clinically indicated, endoscopic procedures like gastroscopy and colonoscopy may be performed, allowing for biopsies to be taken for histological examination.