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Test Code LAB436 Potassium - 24 Hour Urine

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

Specimen Minimum Volume

2.0 mL Urine from a 24 hr collection

Billing Code

2051068

Methodology

Ion Selective Electrode

Specimen Requirements

24 hour urine, 24 hour urine container with no preservative

24 Hour Urine Container Instructions

24 Hour Urine Container with no preservatives

 

Container MUST be labeled with: Office Location, Patient’s First and Last Name and Date of Birth

 

Instruct patient:

  • To label container with Date and time collection started, Date and time collection finished. 
  • Void and DISCARD the first-morning specimen and to record exact time of voiding.
  • Patient should collect all subsequent voided urine for remainder of day and night.
  • Collect first-morning specimen on day 2 at same time as noted on day 1.
  • Collection is complete.
  • Keep urine refrigerated during entire collection. Screw lid on securely.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84133  -  Potassium; urine

Additional Information

Evaluation of electrolyte balance, acid-base balance.  A major application of urine collection for potassium is the evaluation of hypokalemia.  The kidneys do not respond quickly to potassium deprivation.  There is renal wastage of potassium in secondary aldosteronism.  Glucocorticoids also cause diuresis of potassium.  Urinary potassium may be elevated with dietary (food and/or medicinal) increase, hyperaldosteronism, renal tubular acidosis, onset of alkalosis and with other disorders.

Specimen Transport Temperature and Stability

Refrigerate: 2-8° C

Keep refrigerated (Preferred) or on ice; send to laboratory

Assay should be performed within  2 hours after collection is complete

Performing Department

Chemistry

Reasons for Rejection

Lacking collection date

Lacking collection beginning and ending times

Lack of Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth