Review Article
Urinary Biochemistry in the Diagnosis of Acute Kidney Injury
Table 1
Urinary index equations and reference values.
| Urinary indices | Formula | Traditional reference value |
| FeNa | FeNa = [(Nau/NaS)/(cru/crP)] × 100 | <1% transient AKI >1% persistent AKI | FeU | FeU = [(Uu/US)/(cru/crP)] × 100 | <35% transient AKI >35% persistent AKI |
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Na—sodium, cr—creatinine, u—urinary, S—serum, P—plasma, U—urea, and AKI—acute kidney injury. Modified from [ 20, 37]. |