Test Code 24NA Sodium, 24hr Urine
Performing Laboratory
MaineGeneral Medical Center
Specimen Requirements
2 mL from a 24-hour urine collection. No preservative. Mix well before taking 2-mL aliquot. (An entire 24-hour urine collection is also acceptable.) Refrigerate specimen during collection, and send specimen refrigerated in plastic urine container.
See “Urine Collection” in “Special Instructions” for 24-hour specimens.
Label specimen with patient’s name (first and last), date of birth, date and time of collection, 24-Hour urine volume and the collector’s initials.
Specimen stability: 7 days refrigerated at 2-8°C
30 days frozen at ≥-20°C
Minimum volume: 2 mL
Reference Values
40-220 mmol/24 hours
Testing may be performed on random urine specimen. Please be aware there are no normal ranges for random urine sodium
Day(s) Test Performed
Monday through Sunday
Test Classification and CPT Coding
84300 - sodium
81050 - urine timed measurement (if appropriate)