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Test Code LAB435 Potassium, Urine, Timed

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Indirect Ion-Selective Electrode (ISE)

Literature Reference:

Package insert: ISE/Na, K, Cl. Roche Corporation, 12/2020.

Specimen Requirements

Specimen Type: Urine, timed

Container/Tube: Plain, brown urine container

Specimen Volume: Entire collection

 

Collection Instructions: No additive. Refrigerate specimen during collection.

Additional Information:

1. Starting and ending times of collection are required.

2. Follow instructions in Urine Collection in General Information.

3. Containers with preservatives are NOT acceptable.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory 

Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

81050-Volume measurement for timed collection

84133-Potassium

Reference Values

No established reference intervals

Literature Reference: 

Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6 th ed: Chapter 60, p. 1324, Elsevier, St. Louis, MO 2018.

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only

Analyte Stability:

Specimen must be kept refrigerated during collection and before delivery to limit bacterial growth.

Laboratory Processing Instructions:

Test performed in BJH Core Lab. Mix urine well. Record volume, period, and pH on request form. Using 13x100 test tubes, prepare a 7-mL aliquot and deliver to the automated line for centrifugation and delivery to Cobas 8000 for analysis. Completed specimen is stored refrigerated for 5 days.

Special Instructions

See Urine Collection information under General Information.

See Analyte Stability Chart under General Information for a complete list.