CITRATE URINE 24 HOUR
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Compound Enzyme Assay
Diagnosis of renal tubule acidosis and some forms of calcium-dependent kidney stones.
Normal adult: greater than 200 mg/24 hrs (> 1058 uMol/24 hrs)
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
24 hour urine. Instruct patient to void at 8:00am (or 8:00pm) and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24 hour collection period, i.e., 8:00am (or 8:00pm) the following day. SPECIMEN MUST BE KEPT ON ICE DURING THE COLLECTION. Transport promptly to the laboratory. Container must be labeled with date and time collection started and finished. Any test requiring 24 hour urine collection, collected in 50% glacial acetic acid, including urinary oxalate, may also be run on this specimen. Citruria may be seen in alkalinized patient's urine. Cause for Rejection: Specimen not kept chilled during collection.
Collect 24 hour urine specimen. Add 25 mL of 50% glacial acetic acid (15 mL for pediatric patients) to container prior to start of collection. Following collection, mix very well to dissolve any citrate crystals that may have formed, measure 24 hour urine volume, aliquot 20 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Specimens with no preservative are also acceptable: send entire 24 hour collection to MLabs.