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Test Code LAB446 Sodium - 24 Hour Urine

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

Specimen Minimum Volume

1.0 mL urine from a well mixed 24 hour collection

Billing Code

2051191

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.

Specimen Transport Temperature and Stability

Refrigerate during collection

Assay should be performed within 2 hours after the end of collection period

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84300  -  Sodium; urine

Additional Information

Workup of volume depletion, acute renal failure, acute oliguria and when necessary, differential diagnosis of hyponatremia.  In cases of hyponatremia, decreased urine sodium may indicate extrarenal depletion; dehydration (gastrointestinal or sweat loss), congestive heart failure, liver disease or nephrotic syndromes.  Increased urine sodium may indicate diuretics, emesis, intrinsic renal diseases, Addison’s disease, hypothyroidism or syndrome of inappropriate antidiuretic hormone (SIADH).

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