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Glasgow-Blatchford Score (GBS) Calculator
x402
Glasgow-Blatchford Score (GBS) Calculator 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).
Computes the Glasgow-Blatchford Score for predicting need for clinical intervention after upper gastrointestinal haemorrhage, using urea, haemoglobin, blood pressure, heart rate, and comorbidities.
Price / call$0.005
Success—
StatusUnknown
How this service works
Glasgow-Blatchford score (Blatchford 2000) for need for treatment after upper-gastrointestinal haemorrhage. Points from urea, haemoglobin (sex-specific), systolic BP, heart rate ≥100, melena, syncope, hepatic disease, and cardiac failure; max 23. Score 0 is the published low-risk screen; magent does not invent other GBS bands. Not a diagnosis, not Rockall, and not AIMS65. Urea may be mmol/L or BUN mg/dL; haemoglobin g/L or g/dL.
Output
Returns the integer Glasgow-Blatchford Score (0–23), with each variable's point contribution mapped according to the Blatchford 2000 published table. A score of 0 corresponds to the validated low-risk threshold (safe for outpatient management); higher scores indicate increasing need for clinical intervention. The endpoint does not output Rockall or AIMS65 scores and does not invent additional GBS risk bands beyond the published criteria.
Example use cases
ER triage for upper GI bleed
“I have a female patient in the ER with haematemesis — her haemoglobin is 9.8 g/dL, systolic BP is 88 mmHg, heart rate 105, BUN is 28 mg/dL, she had syncope, no melena, no known liver or heart disease. Can you calculate her Glasgow-Blatchford Score so I know if she needs urgent intervention?”
Identify low-risk GI bleed for early discharge
“This male patient had a minor upper GI bleed — his urea is 5.9 mmol/L, haemoglobin is 135 g/L, systolic BP is 118, heart rate 78, no melena, no syncope, no cardiac failure, no liver disease. Run the Glasgow-Blatchford Score to see if he scores 0 and qualifies for outpatient management.”
Automated GBS scoring in a clinical decision workflow
“For a female patient with upper GI bleeding: hemoglobin 10.5 g/dL, BUN 35 mg/dL, systolic BP 100 mmHg, heart rate 95 bpm, melena present, no syncope, has cardiac failure but no hepatic disease — calculate her Blatchford score and tell me what it means for treatment urgency.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/glasgow_blatchfordWhen to prefer
Use this endpoint when you need a validated, published GBS per Blatchford 2000 specifically — not Rockall score, not AIMS65, and not a proprietary risk model. Ideal for clinical decision support agents triaging upper GI haemorrhage, automated EHR scoring workflows, or audit systems checking whether a patient meets the GBS=0 low-risk threshold for safe outpatient discharge. Supports both mmol/L and mg/dL urea, and both g/L and g/dL haemoglobin, making it flexible for US and international clinical contexts.
Side effects
- Missing required parameters (sex, systolic_mm_hg, heart_rate_bpm, melena, syncope, hepatic_disease, cardiac_failure) returns a validation error
- Providing both urea_mmol_l and bun_mg_dl simultaneously causes a conflict error
- Providing both hemoglobin_g_l and hemoglobin_g_dl simultaneously causes a conflict error
- Out-of-range values (e.g. heart rate <30 or >220) are rejected
- Invalid sex value (not 'male' or 'female') returns a parameter error
- Payment failure (insufficient USDC balance or x402 not configured) blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/glasgow_blatchford",
"count": 2,
"items": [
{
"sex": "male",
"score": 0,
"formula": "glasgow_blatchford",
"citation": {
"id": "blatchford-2000",
"doi": "10.1016/S0140-6736(00)02816-6",
"title": "A risk score to predict need for treatment for upper-gastrointestinal haemorrhage",
"source": "Lancet. 2000;356(9238):1318-1321",
"authors": "Blatchford O, Murray WR, Blatchford M"
},
"gbs_risk": "low",
"max_score": 23,
"components": [
{
"value": 5,
"factor": "urea",
"points": 0,
"present": false
},
{
"value": 140,
"factor": "hemoglobin",
"points": 0,
"present": false
},
{
"value": 120,
"factor": "systolic",
"points": 0,
"present": false
},
{
"value": 80,
"factor": "heart_rate",
"points": 0,
"present": false
},
{
"factor": "melena",
"points": 0,
"present": false
},
{
"factor": "syncope",
"points": 0,
"present": false
},
{
"factor": "hepatic_disease",
"points": 0,
"present": false
},
{
"factor": "cardiac_failure",
"points": 0,
"present": false
}
],
"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.",
"urea_mmol_l": 5,
"heart_rate_bpm": 80,
"hemoglobin_g_l": 140,
"systolic_mm_hg": 120,
"formula_expression": "GBS = urea_mmol_l table + haemoglobin_g_l table (sex-specific) + systolic_mm_hg table + (heart_rate_bpm >= 100) + melena + 2*syncope + 2*hepatic_disease + 2*cardiac_failure; max 23; score 0 low, else not_low"
},
{
"sex": "male",
"score": 0,
"formula": "glasgow_blatchford",
"citation": {
"id": "blatchford-2000",
"doi": "10.1016/S0140-6736(00)02816-6",
"title": "A risk score to predict need for treatment for upper-gastrointestinal haemorrhage",
"source": "Lancet. 2000;356(9238):1318-1321",
"authors": "Blatchford O, Murray WR, Blatchford M"
},
"gbs_risk": "low",
"max_score": 23,
"components": [
{
"value": 5,
"factor": "urea",
"points": 0,
"present": false
},
{
"value": 140,
"factor": "hemoglobin",
"points": 0,
"present": false
},
{
"value": 120,
"factor": "systolic",
"points": 0,
"present": false
},
{
"value": 80,
"factor": "heart_rate",
"points": 0,
"present": false
},
{
"factor": "melena",
"points": 0,
"present": false
},
{
"factor": "syncope",
"points": 0,
"present": false
},
{
"factor": "hepatic_disease",
"points": 0,
"present": false
},
{
"factor": "cardiac_failure",
"points": 0,
"present": false
}
],
"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.",
"urea_mmol_l": 5,
"heart_rate_bpm": 80,
"hemoglobin_g_l": 140,
"systolic_mm_hg": 120,
"formula_expression": "GBS = urea_mmol_l table + haemoglobin_g_l table (sex-specific) + systolic_mm_hg table + (heart_rate_bpm >= 100) + melena + 2*syncope + 2*hepatic_disease + 2*cardiac_failure; max 23; score 0 low, else not_low"
}
]
}
}Tags
x402
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