Protein, Total, Body Fluid

CPT: 84157
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Expected Turnaround Time

1 - 2 days

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Specimen Requirements


Body fluid


1 mL

Minimum Volume

0.3 mL (Note: This volume does not allow for repeat testing.)


Clean container


Tube must be labeled with patient's full name and type of fluid collected.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements



Room temperature

14 days


14 days


14 days

Freeze/thaw cycles

Stable x3

Patient Preparation

Usual aseptic aspiration procedure

Causes for Rejection

Improper labeling

Test Details


Evaluate effusions; diagnose transudate versus exudate



Reference Interval

• Peritoneal: Not established

• Pleural:

− Transudate: <3 g/dL

− Exudate: >3 g/dL

• Synovial: <2.5 g/dL

The method performance specifications have not been established for this test in body fluid. The test result should be integrated into the clinical context for interpretation.


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
019588 Protein, Body Fluid 2881-1 019588 Protein, Body Fluid g/dL 2881-1

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