24 Hrs Urinary Citrate

This test measures the amount of citrate excreted in the urine over a 24-hour period. Citrate is a substance that binds with calcium in the urine, preventing the formation of kidney stones. Low urinary citrate levels (hypocitraturia) are associated with an increased risk of calcium stone formation, making this test vital in evaluating patients with recurrent kidney stones or other metabolic disorders.

 The test is often recommended for individuals with a history of recurrent kidney stones, especially calcium oxalate stones. It may also be used to monitor the effectiveness of treatments such as dietary changes, citrate supplements, or medications aimed at reducing stone recurrence. Additionally, it helps in identifying underlying metabolic abnormalities in stone-formers.

Patients are instructed to collect all urine over a 24-hour period in a special container provided by the lab. It is crucial to follow instructions carefully to ensure accuracy. The container should be kept cool during collection, and patients may be advised to avoid certain medications or foods before the test. Failure to collect all urine accurately can lead to invalid results.

Low urinary citrate levels suggest a higher risk for calcium stone formation due to less binding of calcium. High levels, though less common, may be seen in metabolic alkalosis or with potassium citrate supplementation. The results help guide dietary and therapeutic recommendations, including increasing fluid intake, reducing sodium, and using alkali therapy.

Based on citrate levels and other findings from a metabolic stone workup, your doctor may prescribe potassium citrate supplements or recommend dietary modifications such as increased citrus fruit consumption and reduced salt intake. Periodic follow-up tests may be advised to assess treatment efficacy and prevent recurrence of stones.