49135-7
LaboratoryFractional excretion of sodium [Ratio] in Urine and Serum or Plasma
Definition
The fractional excretion of sodium is calculated as follows, where the asterisk is being used to indicate multiplication: 100 * (urine Na * plasma creatinine)/(plasma Na * urine creatinine). Fractional excretion of sodium is used to try to distinguish pre-renal azotemia (FE Na <1% ) from m actute tubular necrosis (FE Na > 1%) and post renal azotemia (FE Na > 4%).
LOINC 6-Axis Classification
Component
Fractional excretion of sodium
Property
Ratio
Time Aspect
Pt
System
Urine+Ser/Plas
Scale Type
Qn
Method Type
N/A
Details
Class
CHEM
Order/Observation
Both
Short Name
Fract excret Na Ur+SerPl-Rto
Display Name
Fractional excretion of sodium (U+S/P) [Ratio]
Related Names
Frequently Asked Questions
What is LOINC code 49135-7?
LOINC code 49135-7 identifies "Fractional excretion of sodium [Ratio] in Urine and Serum or Plasma". The fractional excretion of sodium is calculated as follows, where the asterisk is being used to indicate multiplication: 100 * (urine Na * plasma creatinine)/(plasma Na * urine creatinine). Fractional excretion of sodium is used to try to distinguish pre-renal azotemia (FE Na <1% ) from m actute tubular necrosis (FE Na > 1%) and post renal azotemia (FE Na > 4%).
What does 49135-7 measure?
This code measures Fractional excretion of sodium in Urine+Ser/Plas. It belongs to the CHEM class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.