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.)
10 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 oxalate crystals that may have formed, measure 24 hour urine volume, aliquot 10 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. Random urine collections not acceptable.
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 a 24 hour urine collection, collected in 50% glacial acetic acid, may also be run on this specimen. Cause for Rejection: Specimen not kept chilled; improper container.
Every other week, Wednesday.
8 hours
Compound Enzyme Assay
Less than 40 mg/24 hrs (less than 456 mcMol/24 hrs)
Renal function test, patients who form calcium oxalate kidney stones appear to absorb and excrete a higher portion of dietary oxalate in urine than do normal patients.
Urinary citrate tests for calcium-dependent kidney stones may be run on the same specimen. By ordering "calcium oxalate" the clinician acknowledges that a urine calcium will be performed and billed at a separate additional charge. Hyperoxaluria may occur with high intake of rhubarb, beans, spinach, chocolate, cocoa and tea, with pyridoxine deficiency and occasionally with high ascorbic acid ingestion. Some rare genetic disorders may increase oxalate production. Patients with pancreatic insufficiency, sprue, biliary diversion and who have small intestinal stasis may demonstrate a relationship between fat malabsorption and oxaluria.
2700-3
83945
20752
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. If acid cannot be added at the client site, the entire collection must be sent. [rev 9/08]