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SAAG Calculator (Serum-Ascites Albumin Gradient)
x402
SAAG Calculator (Serum-Ascites Albumin Gradient) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Calculates the Serum-Ascites Albumin Gradient (SAAG) using Runyon 1992 criteria and flags portal hypertension physiology when SAAG ≥ 1.1 g/dL
Price / call$0.005
Success—
StatusUnknown
How this service works
Runyon 1992 SAAG as serum albumin minus ascites albumin in g/dL, rounded to one decimal. portal_hypertension_physiology is true when SAAG >= 1.1 g/dL. Gradient only; not Light-style exudate/transudate criteria for ascites. Not a diagnosis. magent does not diagnose portal hypertension or peritonitis. Serum and ascites albumin as g/dL or g/L.
Output
Returns the calculated SAAG value in g/dL rounded to one decimal place and a boolean portal_hypertension_physiology flag (true when SAAG ≥ 1.1 g/dL). Does not diagnose portal hypertension, peritonitis, or classify by Light criteria.
Example use cases
Cirrhosis ascites workup
“My patient has new-onset ascites and a serum albumin of 3.2 g/dL with ascites albumin of 0.9 g/dL — calculate the SAAG and tell me whether this points to portal hypertension physiology.”
Malignant ascites differentiation
“Can you compute the serum-ascites albumin gradient for serum albumin 42 g/L and ascites albumin 18 g/L, and flag whether the result meets the portal hypertension threshold?”
Hepatic failure monitoring
“Run a SAAG calculation for a cirrhotic patient with serum albumin 2.8 g/dL and ascites albumin 1.9 g/dL — I need to know if the gradient is above or below 1.1.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/saagWhen to prefer
Use this endpoint when you need a fast, deterministic SAAG calculation per Runyon 1992 for portal hypertension physiology classification. Prefer it over generic lab calculators when you need explicit portal_hypertension_physiology boolean output. Note: this does NOT apply Light criteria (exudate/transudate) — use the sibling Light 1972 pleural fluid endpoint for pleural effusions. Best for hepatology, gastroenterology, or hospitalist workflows requiring ascites etiology triage.
Side effects
- Missing required albumin inputs — returns error if neither serum albumin field is provided
- Both unit variants provided for the same parameter (e.g., albumin_g_dl and albumin_g_l simultaneously) — rejected as conflicting input
- Values outside physiological range (e.g., serum albumin below 1 g/dL or above 6 g/dL) may return validation error
- Ascites albumin exceeding serum albumin is physiologically unusual but accepted; gradient may be negative
- Payment failure via x402 protocol returns 402 status before computation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/saag",
"count": 2,
"items": [
{
"formula": "saag",
"citation": {
"id": "runyon-1992",
"doi": "10.7326/0003-4819-117-3-215",
"title": "The serum-ascites albumin gradient is superior to the exudate-transudate concept in the differential diagnosis of ascites",
"source": "Ann Intern Med. 1992;117(3):215-220",
"authors": "Runyon BA, Montano AA, Akriviadis EA, Antillon MR, Irving MA, McHutchison JG"
},
"saag_g_dl": 1.5,
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"albumin_g_dl": 3.5,
"formula_expression": "saag_g_dl = albumin_g_dl - ascites_albumin_g_dl",
"ascites_albumin_g_dl": 2,
"portal_hypertension_physiology": true
},
{
"formula": "saag",
"citation": {
"id": "runyon-1992",
"doi": "10.7326/0003-4819-117-3-215",
"title": "The serum-ascites albumin gradient is superior to the exudate-transudate concept in the differential diagnosis of ascites",
"source": "Ann Intern Med. 1992;117(3):215-220",
"authors": "Runyon BA, Montano AA, Akriviadis EA, Antillon MR, Irving MA, McHutchison JG"
},
"saag_g_dl": 1.5,
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"albumin_g_dl": 3.5,
"formula_expression": "saag_g_dl = albumin_g_dl - ascites_albumin_g_dl",
"ascites_albumin_g_dl": 2,
"portal_hypertension_physiology": true
}
]
}
}Tags
x402
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