Eherer–Fordtran 1992 fecal osmotic gap
Eherer–Fordtran 1992 fecal osmotic gap: stool osmolality minus 2×(stool Na + stool K). Assumed stool osm 290 mOsm/kg when measured osm is omitted. Deterministic published arithmetic with citation; not a diagnosis of osmotic versus secretory diarrhea.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
279 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/stool_osmotic_gap
| 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 | $0.007 | 279 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"stool_osm_mosm_kg": 290,
"stool_potassium_mmol_l": 75,
"stool_sodium_mmol_l": 30
},
{
"stool_osm_mosm_kg": 290,
"stool_potassium_mmol_l": 75,
"stool_sodium_mmol_l": 30
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"stool_osm_mosm_kg": {
"description": "Measured stool osmolality in mOsm/kg (200-600). When omitted, 290 mOsm/kg is assumed.",
"type": "number"
},
"stool_potassium_mmol_l": {
"description": "Stool potassium in mmol/L (1-150).",
"type": "number"
},
"stool_sodium_mmol_l": {
"description": "Stool sodium in mmol/L (1-150).",
"type": "number"
}
},
"required": [
"stool_sodium_mmol_l",
"stool_potassium_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"
}