Fractional excretion of sodium (FENa) from plasma and urine sodium and creatinin
Fractional excretion of sodium (FENa) from plasma and urine sodium and creatinine. Espinel 1976 oliguric ARF strata. Deterministic published formula with citation; not a diagnosis.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
257 msmedian answer time
$0.005listed price per call
$0.007price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.magentlab.com/api/calc/fena
| Category | Everything else |
|---|---|
| Provider host | api.magentlab.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.007 | 257 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"creatinine_mg_dl": 2,
"creatinine_umol_l": 176.84,
"sodium_mmol_l": 140,
"urine_creatinine_mg_dl": 100,
"urine_creatinine_umol_l": 8842,
"urine_sodium_mmol_l": 20
},
{
"creatinine_mg_dl": 2,
"creatinine_umol_l": 176.84,
"sodium_mmol_l": 140,
"urine_creatinine_mg_dl": 100,
"urine_creatinine_umol_l": 8842,
"urine_sodium_mmol_l": 20
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"creatinine_mg_dl": {
"description": "Plasma creatinine in mg/dL (0.1-20). Provide this or creatinine_umol_l.",
"type": "number"
},
"creatinine_umol_l": {
"description": "Plasma creatinine in \u00b5mol/L (9-1768). Converted as mg/dL = \u00b5mol/L / 88.42.",
"type": "number"
},
"sodium_mmol_l": {
"description": "Plasma or serum sodium in mmol/L (110-160).",
"type": "number"
},
"urine_creatinine_mg_dl": {
"description": "Urine creatinine in mg/dL (1-500). Provide this or urine_creatinine_umol_l.",
"type": "number"
},
"urine_creatinine_umol_l": {
"description": "Urine creatinine in \u00b5mol/L (88-44210). Converted as mg/dL = \u00b5mol/L / 88.42.",
"type": "number"
},
"urine_sodium_mmol_l": {
"description": "Urine sodium in mmol/L (1-300).",
"type": "number"
}
},
"required": [
"sodium_mmol_l",
"urine_sodium_mmol_l"
],
"type": "object"
},
"maxItems": 25,
"minItems": 1,
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}