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Fractional Sodium Excretion, Plasma or Serum and Urine
MessageCall CoxHealth Laboratories at 417-269-7820 at beginning of urine collection to ensure that a plasma or serum specimen is drawn
Test Code
6123
CPT Codes
82565-Creatinine, plasma or serum; 82570-Creatinine, urine; 84295-Sodium, plasma or serum; 84300-Sodium, urine
Preferred Specimen
Plasma or serum and urine are required.
Blood specimen should be drawn during 24-hour period of urine collection.
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate serum on request form. 2. Label specimen appropriately (serum).
Urine (Random Preferred):
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a random urine collection
Collection Instructions: No preservative.
Note: 1. Indicate random urine. 2. Label specimen appropriately (random urine).
Alternate: 24 hr urine:
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a 24-hour urine collection
Collection Instructions: No preservative.
Note: 1. 24-Hour volume is required. 2. Follow instructions in Urine Collection in Special Instructions. 3. Indicate urine. 4. Label specimen appropriately (urine).
Blood specimen should be drawn during 24-hour period of urine collection.
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate serum on request form. 2. Label specimen appropriately (serum).
Urine (Random Preferred):
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a random urine collection
Collection Instructions: No preservative.
Note: 1. Indicate random urine. 2. Label specimen appropriately (random urine).
Alternate: 24 hr urine:
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a 24-hour urine collection
Collection Instructions: No preservative.
Note: 1. 24-Hour volume is required. 2. Follow instructions in Urine Collection in Special Instructions. 3. Indicate urine. 4. Label specimen appropriately (urine).
Methodology
Ion-Selective Electrode (ISE)/Kinetic Jaffe
Setup Schedule
Monday through Sunday
Reference Range
1.0-2.0
Clinical Significance
Useful for differentiating pre-renal failure and acute tubular necrosis
Performed By
CoxHealth
