Sandbox: malabsorption

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Abbreviations: WBC: White blood cells; Plt: Platelets, Hgb: Hemoglobin, IgE: Immunoglobulin E, IgA: Immunoglobulin A

Cause Clinical manifestation Lab findings Additional findings Cause/Pathogenesis Gold standard diagnosis
Symptoms Signs
Diarrhea Fever Abdominal pain Weight loss
Watery Bloody Fatty WBC Hgb Plt Other lab findings
Whipple's disease + - + ± + + ↓/↑
Celiac disease ± - ± - + + - -
  • IgA endomysial antibody
  • Anti-tissue transglutaminase antibody
  • Anti-gliadin antibody
  • IgA endomysial antibody
  • IgA tissue transglutaminase antibody
Tropical sprue + - + + + + - -
  • Diagnosis of exclusion
Crohns disease + + + + + +
  • Abnormal immune response to self antigens
Ulcerative colitis + + + + + +
  • Hypoalbuminemia
  • Hypokalemia
  • Hypomagnesemia
  • Iron deficiency
  • Elevated ESR
  • Elevated CRP
  • Abnormal immune response to self antigens
Cystic fibrosis - - + ± + + - -
  • Positive DNA analysis for CFTR
  • Evaluated nasal transepithelial potential difference (NPD)
VIPoma + - + - + + - - -
  • Primary secretory tumor
  • Elevated VIP levels
  • Followed by imaging
Zollinger-Ellison syndrome + - + - + + - -
  • Elevated basal or stimulated serum gastrin> 120 pg/mL
Eosinophilic gastroenteritis  + - + - + + - -
Primary bile acid malabsorption + - + - + + - -
Abetalipoproteinemia + - + - + + - - -
Microscopic colitis + + - - + + - -
Hyperthyroidism + - - ± + + - - -
  • Elevated T4
  • Elevated T3
  • Decreased TSH
Lactose intolerance + - - - + - - - -
Irritable bowel syndrome ± - ± - ± - - - -
  • Diagnosis of exclusion
Chronic pancreatitis + - + - + +
Cirrhosis + - + + + +
Short bowel syndrome -
Intestinal lymphoma
Agammaglobulinemia
Intestinal lymphangiectasia
Amyloidosis
Mastocytosis
Small intestinal bacterial overgrowth
Drug induced enteritis
HIV infection
Giardiasis
Strongyloidiasis
Tuberculosis