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Malabsorption Markers – Definition & Diagnostics

Malabsorption markers are laboratory values that indicate impaired nutrient absorption in the intestine. They help doctors detect malabsorption syndromes at an early stage.

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Malabsorption markers are laboratory values that indicate impaired nutrient absorption in the intestine. They help doctors detect malabsorption syndromes at an early stage.

What are malabsorption markers?

Malabsorption markers are diagnostic laboratory parameters that indicate the small or large intestine is unable to adequately absorb nutrients, vitamins, minerals, or other substances. This condition is referred to as malabsorption. It may affect individual nutrients or occur in a generalised form, potentially influencing many organ systems throughout the body.

Causes of malabsorption

Malabsorption can be triggered by a wide range of diseases and conditions, including:

Coeliac disease: an immune-mediated condition in which gluten damages the intestinal lining
Crohn's disease: a chronic inflammatory bowel disease
Chronic pancreatitis: damage to the pancreas with reduced enzyme production
Lactase deficiency: absent or insufficient enzyme activity to break down lactose
Short bowel syndrome: following surgical removal of intestinal sections
Small intestinal bacterial overgrowth (SIBO)
Damage caused by radiation therapy or certain medications

Commonly used malabsorption markers

Depending on the suspected cause, different markers are measured. The most important ones include:

Fat malabsorption markers

Faecal fat determination (steatocrit / stool fat content): elevated fat content in the stool indicates impaired fat absorption
Faecal elastase-1: a low value points to exocrine pancreatic insufficiency

Carbohydrate malabsorption markers

Hydrogen breath test: measures hydrogen production after a sugar load and detects lactose or fructose intolerance as well as bacterial overgrowth
Blood glucose test after lactose loading: an insufficient rise in blood sugar indicates lactase deficiency

Vitamin malabsorption markers

Serum vitamin B12: reduced in small intestinal disorders or gastric disease
Serum folate (folic acid): deficiency is common in coeliac disease and inflammatory bowel conditions
Vitamin D (25-OH vitamin D): reduced with fat malabsorption
Vitamin A and vitamin E: low levels observed in pronounced malabsorption

Mineral and trace element markers

Serum calcium, magnesium, zinc, and iron: frequently reduced in chronic malabsorption
Ferritin and transferrin saturation: indicators of impaired iron absorption, for example in coeliac disease

General serum markers

Albumin and prealbumin: reflect protein deficiency due to reduced absorption or increased intestinal loss
Cholesterol: may be reduced in severe malabsorption
Prothrombin time / INR: prolonged clotting time due to vitamin K deficiency in fat malabsorption

Specific immunological and inflammatory markers

Tissue transglutaminase antibodies (tTG-IgA): screening marker for coeliac disease
Faecal calprotectin: elevated in inflammatory bowel diseases that lead to malabsorption
Faecal alpha-1-antitrypsin: indicates protein-losing enteropathy

Diagnosis and clinical relevance

The selection of markers depends on the clinical presentation. Typical symptoms that justify testing for malabsorption markers include:

Chronic diarrhoea or voluminous, greasy stools (steatorrhoea)
Unintentional weight loss
Bloating and abdominal pain after eating
Fatigue, weakness, and difficulty concentrating
Signs of deficiency such as pale skin, brittle nails, or bone and muscle pain

Diagnosis is established through a combination of medical history, physical examination, laboratory testing, and if necessary, imaging procedures or intestinal endoscopy with tissue sampling (biopsy).

Treatment

Therapy is directed at the underlying condition:

For coeliac disease: strict gluten-free diet
For pancreatic insufficiency: supplementation with digestive enzymes (pancreatin)
For nutrient deficiencies: targeted supplementation of vitamins and minerals
For bacterial overgrowth: antibiotic therapy
For inflammatory bowel disease: anti-inflammatory drugs or immunosuppressants

Regular monitoring of malabsorption markers is important to evaluate treatment success and to detect deficiency states in a timely manner.

References

German Society for Gastroenterology, Digestive and Metabolic Diseases (DGVS): Guideline on the Diagnosis and Treatment of Coeliac Disease (2021).
Kasper, D.L. et al. (eds.): Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill (2022).
Green, P.H.R. & Cellier, C.: Celiac Disease. New England Journal of Medicine, 357(17):1731-1743 (2007).

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