E72.541

Clinical Causes: Chronic gastrointestinal diseases such as Crohn's disease or ulcerative colitis Malabsorption syndromes, including celiac disease or following bariatric surgery Steatorrhea or fat malabsorption that binds calcium, leaving oxalate free for absorption Certain surgeries involving removal or bypass of parts of the small intestine Use of antibiotics that alter gut bacteria involved in oxalate metabolism Low dietary calcium intake which normally helps bind oxalate in the gut

Key Symptoms: Recurrent kidney stones, particularly those composed of calcium oxalate Flank pain or flank discomfort due to kidney stone passage Hematuria, or blood in the urine Urinary tract infections Fatigue or general malaise if kidney function declines Possible symptoms of underlying gastrointestinal disorders

Diagnosis Path: The diagnosis of enteric hyperoxaluria involves a combination of clinical assessment and laboratory testing. Key diagnostic steps include: - Urinalysis to detect elevated oxalate levels and identify kidney stones - 24-hour urine collection to measure oxalate excretion - Blood tests to evaluate kidney function and calcium levels - Stool analysis to assess fat absorption and steatorrhea - Imaging studies such as ultrasound or CT scan of the kidneys to detect stones - Evaluation of gastrointestinal history to identify underlying disorders In some cases, specialized tests like oxalate absorption studies or intestinal biopsies may be warranted to understand the severity and cause of malabsorption.

Treatment Protocols: Managing enteric hyperoxaluria focuses on reducing oxalate levels and addressing any underlying gastrointestinal issues. Common strategies include: - Dietary modifications to limit oxalate intake, such as reducing foods like spinach, nuts, and tea - Adequate hydration to dilute urine and prevent stone formation - Ensuring sufficient dietary calcium intake to bind oxalate in the gut - Use of medications like calcium supplements or oxalate-binding agents - Treating underlying gastrointestinal conditions to improve absorption and reduce oxalate absorption - In some cases, minimizing fat malabsorption through dietary changes or medications - Regular monitoring of urine oxalate levels and kidney health Patients should work with healthcare professionals to develop a tailored management plan suited to their specific needs and health status.