Employee Login  |   Subscribe  |   Careers  |   Appointments
List All Test Names Beginning With:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Sodium, Fractional Excretion

Source Blood and Urine
Mnemonic FNA
Specimen Requirements

Samples for blood and random urine for Sodium and Creatinine are required and are all ordered with the FNA mnemonic along with the associated calculations.

See Sodium blood and urine AND Creatinine blood and urine for collection requirements.

1 hour, 2 hour or 3 hour urine collection may be requested by doctor.

24-hour urines are not acceptable specimens for this test.

Collect blood and urine samples at the same time with no more than 3 hours between blood and urine collections.

Delay collection of specimens until 6 - 8 hours after last dose of diuretic.

Specimen Handling
Additional Information Fractional Sodium is a calculation which includes serum sodium and creatinine, and urine sodium and creatinine concentrations.
Testing Location Chemistry-ACH, DSC, FMC, PLC, RGH & SHC
Testing Frequency Daily
Alternate Name(s) Fractional Sodium Excretion
Reference Interval