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HealthGratuito

Calculadora de FENa

Calcule a Fracao de Excrecao de Sodio (FENa) para diferenciar entre causas pre-renais e renais de lesao renal aguda.

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Resultado

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Assistente IA

Perguntar sobre esta calculadora

Posso ajudar a entender a formula de calculadora de fena, interpretar seus resultados e responder perguntas de acompanhamento.

Tente perguntar

Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.

Formula

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Formula principal
FENa=UNa×SCrSNa×UCr×100\text{FENa} = \frac{U_{Na} \times S_{Cr}}{S_{Na} \times U_{Cr}} \times 100

Como funciona: Compara a excrecao de sodio com a excrecao de creatinina para avaliar se os rins estao retendo sodio apropriadamente (pre-renal) ou nao (renal).

Exemplo Resolvido

UNa 20, PCr 2,0, PNa 140, UCr 100: FENa = (20 x 2,0) / (140 x 100) x 100 = 0,29%. FENa < 1% sugere causa pre-renal.

Perguntas Frequentes

O que FENa < 1% significa?

FENa abaixo de 1% sugere causa pre-renal (desidratacao, hipotensao). Os rins estao retendo sodio apropriadamente.

O que FENa > 2% indica?

FENa acima de 2% sugere lesao renal intrinseca (necrose tubular aguda). Os rins perderam a capacidade de reter sodio.

Quando a FENa nao e confiavel?

Em uso de diureticos, na presenca de glicosuria, ou em doenca renal cronica previa. Nesses casos, use a FEUreia.

Calculadoras Relacionadas

BUN Creatinine Ratio CalculatoreGFR Calculator (MDRD)

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