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Test ID OPTU Orthostatic Protein, Timed Collection, Urine

Useful For

Diagnosis of orthostatic proteinuria

 

As a second-order test for additional characterization of proteinuria of less than 3 grams/24 hours, particularly in children or adolescents

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Urine


Ordering Guidance


This collection process requires 2 separate urine collections within a 24-hour period.

 

Collect specimen per instructions in Orthostatic Protein Measurement 24-Hour Urine: Collection Site Instructions (T546) in Special Instructions.



Necessary Information


This collection process requires 2 separate urine collections within a 24-hour period.

-Submit start and end times for collection and 16-hour volume (required).

-Submit start and end times for collection and 8-hour volume (required).



Specimen Required


Specimens should be collected before fluorescein is given or not collected until at least 24 hour later.

 

Supplies: 2 Sarstedt 5 mL Aliquot Tube (T914)

Daytime Collection

Container/Tube: Plastic, 5-mL tube

Specimen Volume: 4 mL

Collection Instructions:

1. Collect a 16-hour (daytime) urine specimen.

2. No preservative.

3. Invert well before taking 4-mL aliquot.

4. Do not over fill aliquot tube 4 mL at most.

5. Collect specimen per instructions in Orthostatic Protein Measurement 24-Hour Urine: Collection Site Instructions (T546) in Special Instructions.

 

Nighttime (Supine) Collection

Container/Tube: Plastic, 5-mL tube

Specimen Volume: 4 mL

Collection Instructions:

1. Collect an 8-hour (nighttime) urine specimen.

2. No preservative.

3. Invert well before taking 4-mL aliquot at most.


Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  24 hours

Reference Values

Nighttime (supine) collection: <68 mg/8 hours

Reference values have not been established for patients <18 years of age.

 

Daytime collection: <197 mg/16 hours

Reference values have not been established for patients <18 years of age

CPT Code Information

84156 x 2

Reject Due To

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

Forms

1. Orthostatic Protein Measurement 24-Hour Urine: Patient Collection Instructions in Special Instructions

2. If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.

Secondary ID

614360

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 to 4 days