#ExistCollect>Collect: 24-hour urine. Refrigerated during collection. Also acceptable: Random urine. Reported as mg/L and have no reference interval.
#ExistSPECIMENPREPARATION>Specimen Preparation: Transfer 12 mL aliquot of urine from a well-mixed 24-hour collection to ARUP Standard Transport Tubes. Also acceptable: Specimens refrigerated with preservatives are acceptable. Sample pH must be 5.0 - 7.0. Mix well, add 1 g boric acid/100 mL urine, adjust pH (with boric acid) to 5.0-7.0 and freeze. Record total volume, collection time, and pH on transport tube and test request form.
#ExistSPECTRANSPORT>Storage/Transport Temperature: Frozen.
#ExistConditions>Unacceptable Conditions: Alkali preservatives (e.g. specimens previously preserved with NaOH).
#ExistStability>Stability (collection to initiation of testing): Ambient: 4 hours (with preservative); Refrigerated: 1 week (with preservative); Frozen: 1 month