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Gut Oxalate Absorption in Calcium Oxalate Stone Disease
Gastrointestinal Oxalate Absorption in Calcium Oxalate Stone Disease
Who can join
Ages 18 to 70 · All sexes · Healthy volunteers welcome
Full eligibility criteria
Inclusion Criteria: * age 18-70 yrs * Body Mass Index \> 18.5 kg/m2 * Normal fasting serum electrolytes on comprehensive metabolic profile * Willing to ingest fixed diets * Willing to stop supplements (vitamins including vitamin C, calcium (citrate or carbonate) and other minerals, herbal supplements, nutritional aids, probiotics) for 2 weeks before start and during study. * For stone formers: first time or recurrent Calcium Oxalate stone former. Composition of most recent stone ≥ 50% calcium oxalate if available, uric acid component \<20% Exclusion Criteria: * Chronic Kidney Disease stage 4-5 * Primary hyperoxaluria, Enteric (secondary) hyperoxaluria * Liver, bowel, endocrine or renal diseases (other than idiopathic Calcium Oxalate kidney stones) or any other condition that may influence the absorption, transport or urinary excretion of ions, which will compromise the interpretation of results, including: Cystic fibrosis, Celiac disease, Cystinuria, Uric acid stone former, Nephrotic syndrome, Sarcoidosis, Renal tubular acidosis, Primary hyperparathyroidism, Neurogenic bladder, Urinary diversion, Chronic diarrhea, Bariatric surgery, Inflammatory bowel disease * Pregnancy or breast-feeding * Incompatible dietary requirements with the study, food allergies or intolerance to any of the foods in study menus * Active malignancy or treatment for malignancy within 12 months prior to screening * Utilization of immunosuppressive medication * Uncontrolled hypertension or diabetes * Diabetes type 1 * Chronic NSAID use
About the study
The goal of this clinical trial study is to test if patients with idiopathic calcium oxalate kidney stones have an increased absorption of dietary oxalate, which would lead to increased urinary excretion of oxalate.
The study will recruit adult patients with a history of calcium oxalate kidney stones and healthy volunteers without kidney stones.
Participants will
* ingest fixed diets containing low and moderately high amounts of oxalate for 5 days at a time * ingest a soluble form of oxalate and sugar preparations to test gut permeability * collect urine, blood, stool and breath sample during the fixed diets and the soluble oxalate test
What is being tested
- Low-oxalate diet (dietary supplement)
- High-oxalate diet (dietary supplement)
- soluble oxalate gut absorption test (other)
Sponsor: University of Alabama at Birmingham · Participants: 80 · Started: Apr 17, 2024
Contact the study team
- Sonia Fargue, PhD · Phone: 2059756932
Official record on ClinicalTrials.gov — NCT06331546
Locations in the U.S.
| Alabama | University of Alabama at Birmingham, Birmingham |
| Texas | UTSW, Dallas |
Conditions
From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.