Laboratory test | Laboratory finding | Potential significance |
Stool for occult blood (if not already performed) | Positive | Enteric infection, IBD, juvenile polyps, acid-peptic disease, foreign body, vasculitis (eg, polyarteritis nodosa); proximal small bowel disease (Crohn disease, Helicobacter pylori, peptic disease, celiac disease) |
Complete blood count with differential | Anemia | Celiac disease, IBD |
Leukocytosis | Infection or inflammation | |
Eosinophilia | Atopic disease, eosinophilic esophagitis; parasitic infection | |
Thrombocytosis | Iron deficiency, ongoing inflammation | |
ESR/CRP | Elevated ESR or CRP | Active inflammatory process (nonspecific) |
Metabolic panel | Elevated ALT | Hepatic inflammation (eg, chronic hepatitis) |
Elevated direct bilirubin | Cholestasis | |
Elevated GGT | Common bile duct stone | |
Decreased albumin | Defective liver protein synthesis, intestinal protein loss (Crohn disease) | |
Lipase | Elevated | Acute pancreatitis |
Immunoglobulin A tissue transglutaminase antibodies (if not already performed) | Positive | Celiac disease |
Urinalysis | Hematuria | Nephrolithiasis |
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