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Orderable Name OSM24 Osmolality, 24 Hour, Urine


Necessary Information


24-Hour volume (in milliliters) is required.



Specimen Required


Supplies:

-Diazolidinyl Urea (Germall), 5.0 mL (T822)

-Urine Tubes, 10 mL (T068)

Container/Tube: 24-hour graduated urine container with no metal cap or glued insert

Specimen Volume: 10 mL

Collection Instructions:

1. Collect urine for 24 hours

2. Add 5 mL of diazolidinyl urea as preservative at start of collection or refrigerate specimen during and after collection.

Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.


Useful For

Assessing the concentrating and diluting ability of the kidney using a 24-hour urine collection

Method Name

Freezing Point Depression

Specimen Type

Urine

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  72 hours

Reject Due To

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Reference Values

0-11 months: 50-750 mOsm/kg

≥12 months: 150-1,150 mOsm/kg

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

CPT Code Information

83935

Urine Preservative Collection Options

Note: The addition of preservative or application of temperature controls must occur at the beginning of the collection.

Ambient (No additive)

No

Refrigerate (No additive)

Preferred

Frozen (No additive)

OK

50% Acetic Acid

No

Boric Acid

No

Diazolidinyl Urea (Germall)

OK

6M Hydrochloric Acid

No

6M Nitric Acid

No

Sodium Carbonate

No

Thymol

No

Toluene

No