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Test Name:
Sodium, Body Fluid
- SBMF No:
23144 - Performance Lab Name:
Automated Lab - Test Mnemonic:
BF NA - ABN:
Not required - CPT Code:
84302 - LOINC Code:
2950-4 - Also Known As:
Body Fluid Sodium - Spec Type:
Body fluid - Spec Container:
Red top (serum) tube - Pref Vol:
1.0 mL - Min Vol:
0.3 mL - Fasting:
No - Spec Collect:
Collected by physician or nursing personnel
Document source of fluid on label and requisition - Spec Process:
If fluid is bloody, centrifuge 15 minutes
Immediately transfer supernatant to plastic tube - Spec Store Transport:
Refrigerated - Spec Stability:
3 days refrigerated (2-8°C) - Spec Reject:
Hemolyzed sample - Spec Remarks:
Methods of body fluid collection vary and several different transport containers may be used:
Body fluid should be submitted to the laboratory in 3 evacuated tubes:
1) An aliquot in an evacuated tube containing EDTA anticoagulant may be used for the cell count, differential, crystals, and specific gravity :
Preferred volume is 3.0 mL and the minimum volume is 1.0 mL.
Note: Specimens received in heparin anticoagulant should have cell count performed and reported with footnote disclaimer:
“Specimen received in heparin tube. Cell count may be inaccurate.”
2) An aliquot in an anticoagulant free evacuated tube may be used for all chemistry analysis. Preferred volume is 10.0 mL and the minimum volume is 3.0 mL.
3) An aliquot in an evacuated tube containing Sodium Polyanethol-Sulfonate (SPS) anticoagulant may be used for routine culture, acid fast, and fungus.
Anaerobic media is inoculated at the bedside. Minimum volume is 1.0 mL. - Methodology:
Ion-selective Electrode (ISE) - Use:
Evaluate electrolyte composition of fluids for acid-base balance, water balance data - Clinical Significance:
The role of electrolytes in the human body is manifold. There are almost no metabolic processes that are not dependent on or affected by electrolytes. Among other functions of the electrolytes are maintenance of osmotic pressure and water distribution in the various body fluid compartments, maintenance of the proper pH, regulation of the proper function of the heart and other muscles, involvement in oxidation-reduction reactions, and participation in catalysis of cofactors for enzymes. Serous fluids for laboratory examination are collected by needle aspiration from body cavities. These aspiration procedures could include thoracentesis (pleural), pericardiacentesis (pericardial), synovial (joint) fluid and paracentesis (peritoneal). Many pathologic conditions can cause a buildup (effusion) of serous fluids. Effusion of serous fluid can be placed into two general categories: transudates and exudates. A transudate disrupts the balance in the regulation of fluid filtration and reabsorption. An example is the changes in hydrostatic pressure created by congestive heart failure. Exudates are produced by conditions that directly involve the membranes of the particular cavity including infections and malignancies. Analysis of body fluid usually includes one or more of the following: cell count, differential, total protein, crystals, pH, specific gravity, glucose, albumin, amylase, sodium, potassium, chloride, LD, creatinine, urea nitrogen, uric acid, routine culture, and cytologic studies. Additional testing may include specialized microbiology cultures for AFB or fungus or testing for the presence of bilirubin. Only those tests that are ordered will be performed. - Reference Range:
Reference ranges not available for body fluid specimens
Physician must interpret results based upon origin of fluid and patient's clinical condition - Day Run:
Sun-Sat (daily) - Time Run:
As received - Time Reported:
8 hours - Test Type:
BODY FLUID
