Plastic container with 25 mL of 50% glacial acetic acid (15 mL for pediatric patients) as preservative. Container available from MLabs. (Specimen with no preservative will be accepted.)
20 mL aliquot of 24 hour urine collection
5 mL aliquot of 24 hour urine 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.
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. 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.
Test performed every other week, on Friday.
8 hours
Compound Enzyme Assay
Normal adult: greater than 200 mg/24 hrs
Diagnosis of renal tubule acidosis and some forms of calcium-dependent kidney stones.
6687-8
82507
20751
May be collected in plain (no preservative) container and acid added at the end of collection. It is preferred to have acid added as soon as possible at the client site, mixed very well, and an aliquot sent. It is very important to mix well with acid prior to aliquotting to dissolve any crystals that may have formed.