Navigating Protein-Losing Enteropathy: A Stepwise Approach for Primary Care Clinicians

Area of Science:

• Gastroenterology
• Internal Medicine
• Rare Diseases

Background:

• Protein-losing enteropathy (PLE) is a rare syndrome of excessive serum protein loss via the GI tract.
• Over 60 conditions are linked to PLE, often presenting nonspecifically with edema, diarrhea, or malnutrition, delaying diagnosis.
• PLE results from mucosal injury or lymphatic dysfunction.

Purpose of the Study:

• To provide a practical overview of protein-losing enteropathy.
• To discuss pathophysiologic mechanisms, clinical features, and diagnostic approaches.
• To outline indications for subspecialty referral in PLE management.

Main Methods:

• Review of existing literature on protein-losing enteropathy.
• Exclusion of hepatic, renal, and nutritional causes.
• Targeted diagnostic testing including stool α1-antitrypsin and endoscopy.

Main Results:

• PLE is associated with diverse underlying conditions across multiple organ systems.
• Nonspecific symptoms can lead to delayed recognition and management.
• Prompt identification allows for management of complications and treatment of secondary causes.

Conclusions:

• Early identification of PLE is essential for timely management of associated complications.
• Diagnostic evaluation requires excluding other causes and employing specific tests like stool α1-antitrypsin.
• Understanding PLE's mechanisms and diagnostic pathway aids in effective patient care and referral.