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Normal range: 15-78 mg/24hrs

Comment:Urinary collection is valuable to detected magnesium deficiency due to gastrointestinal causes (e.g., gut failure or Crohn disease). Replacement of Mg in patients with gut failure should be directed at normalization of urinary Mg. The propensity to form calcium oxalate kidney stones is related to urine concentrations of oxalate and calcium, and inversely to those of citrate and Mg

Sample: 24 hr urine