Synopsis
Recognise protein-losing enteropathy as a syndrome, confirm gastrointestinal protein loss only after excluding common alternatives, and direct treatment towards its mucosal, lymphatic or cardiovascular cause.
- Protein-losing enteropathy describes excessive loss of plasma proteins into the gastrointestinal tract; it is a mechanism requiring an underlying diagnosis, not a final disease label.
- Before attributing hypoalbuminaemia to the gut, assess hepatic synthesis, urinary protein loss, inflammation, malnutrition, burns and dilution because these are commoner explanations.
- Mechanisms include erosive mucosal disease, non-erosive mucosal permeability and obstructed or high-pressure intestinal lymphatic drainage; several can coexist.
- Oedema, ascites or effusions may dominate, while diarrhoea can be absent; lymphocyte and immunoglobulin loss is particularly suggestive of intestinal lymphangiectasia.
- Faecal alpha-1-antitrypsin testing supports gastrointestinal protein loss, but collection, stool consistency, gastric acidity and laboratory method affect interpretation and a negative result does not always exclude it.
- Endoscopy with biopsies, small-bowel imaging and cardiovascular assessment are selected from the suspected mechanism rather than ordered as an indiscriminate panel.
- Treat the cause and replace nutritional deficits; high-protein or modified-fat strategies need specialist dietetic supervision, especially when lymphatic disease or intestinal failure is possible.
- Albumin infusion and diuresis may temporarily manage severe fluid consequences but do not stop enteric loss and can create intravascular depletion without close monitoring.
Key red flags
Hypotension, acute kidney injury, oliguria or severe electrolyte disturbance in an oedematous patient suggests reduced effective circulating volume and needs urgent monitored management.
Sepsis, peritonism, gastrointestinal bleeding, obstruction or severe abdominal pain requires emergency assessment for an inflammatory, ischaemic, malignant or surgical cause.
Rapidly progressive anasarca, respiratory compromise from effusions or thrombosis risk during profound protein depletion warrants inpatient multidisciplinary care.
A child or adult with congenital heart palliation and new oedema, diarrhoea or low albumin needs prompt specialist cardiac assessment because haemodynamic failure may be central.
Do not commence prolonged parenteral nutrition or repeated albumin infusions without nutrition-team and cause-specific review.
Investigation priorities
Confirm severity and follow the biochemical trajectory.
Management branches
Persistent hypoalbuminaemia, oedema or effusions lack a sufficient hepatic, renal or nutritional explanation.
- Confirm the trend and review inflammation, liver synthetic function, quantified urine protein, diet, fluid state, burns and medication or infusion history.
- Request faecal alpha-1-antitrypsin testing through the local referral laboratory, following its sampling and paired-serum requirements exactly.
- Assess nutritional, immune and electrolyte consequences while documenting stool frequency, bleeding, pain, surgery, cardiac history and systemic symptoms.
- Treat immediate fluid, infection and nutrition threats without allowing temporary biochemical improvement after albumin to be mistaken for diagnostic proof.