Parameter
| Biomarker | UNa / FEK | Full name | Urinary sodium/ fractional excretion of potassium | Molecular Type | Electrolyte / function index |
|---|---|---|---|---|---|
| Molecular Formula | Molecular Weight | Core Functional Dimensions | Early warning, microcirculation stress assessment | ||
| Disease | Acute Kidney Injury (AKI) | Disease Subtypes | / | ||
| Organ | Kidney | Test Sample / Technology Platform | Urine（Electrolyte detection, biochemical calculation） | ||
| Pathobiological Mechanisms | The decrease of UNa reflects renal microcirculation stress, and the increase of FEK indicates early renal tubular injury. | ||||
| Clinical Availability Status | Clinical routine use ( functional evaluation ) | ||||
| Notes and Dynamics | UNa decreased 1-2 days before AKI.FEK was not affected by diuretics and was more sensitive than fractional excretion of sodium ( FENa ). | ||||