||Within 24 hours
#ExistCollect>Collect: 24-hour urine. Refrigerate specimen during collection. Also acceptable: Random urine.
#ExistSPECIMENPREPARATION>Specimen Preparation: Urine pH must be adjusted to greater than 8.0. If pH is less than or equal to 8.0, adjust pH to greater than 8.0 by adding 5 percent NaOH. Mix well and allow entire 24-hour collection to stand for 15 minutes. Recheck pH and readjust if necessary. Transfer one 3 mL aliquot from a well-mixed 24-hour collection to an ARUP Standard Transport Tube. (Min: 0.5 mL) Record total volume, collection time interval, and pH on transport tube or aliquot tube and on test request form.
#ExistSPECTRANSPORT>Storage/Transport Temperature: Refrigerated.
#ExistConditions>Unacceptable Conditions: Specimens with pH less than 8.0. Urine collected with acid.
#ExistStability>Stability (collection to initiation of testing): Ambient: 4 days; Refrigerated: 4 days; Frozen: 2 weeks