van der Heijde 2009 ASDAS-CRP
van der Heijde 2009 ASDAS-CRP: 0.12*back pain + 0.06*morning stiffness duration + 0.11*patient global + 0.07*peripheral pain/swelling + 0.58*ln(CRP+1). BASDAI 0-10 items and CRP in mg/L. ASAS selected the CRP version as preferred. magent does not examine the patient or assay CRP. Not ASDAS-ESR. Not BASDAI total. Does not apply Machado 2011 1.3/2.1/3.5 activity cuts. Not a diagnosis or biologic order.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
433 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/asdas_crp
| 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 | $0.007 | 433 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"back_pain": 0,
"crp_mg_l": 0,
"morning_stiffness_duration": 0,
"patient_global": 0,
"peripheral_pain_swelling": 0
},
{
"back_pain": 0,
"crp_mg_l": 0,
"morning_stiffness_duration": 0,
"patient_global": 0,
"peripheral_pain_swelling": 0
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"back_pain": {
"description": "Caller-assigned total back pain on a 0-10 VAS or NRS (van der Heijde 2009; BASDAI question 2, neck/back/hip pain). Number 0-10. magent does not examine the patient.",
"type": "number"
},
"crp_mg_l": {
"description": "Caller-assigned C-reactive protein in mg/L (van der Heijde 2009; not mg/dL). Number 0-500 is a magent clamp. The 2009 papers do not floor CRP at 2 mg/L. magent does not assay CRP.",
"type": "number"
},
"morning_stiffness_duration": {
"description": "Caller-assigned duration of morning stiffness on a 0-10 VAS or NRS (van der Heijde 2009; BASDAI question 6). Number 0-10, not hours. magent does not examine the patient.",
"type": "number"
},
"patient_global": {
"description": "Caller-assigned patient global assessment of disease activity on a 0-10 VAS or NRS (van der Heijde 2009). Number 0-10. magent does not examine the patient.",
"type": "number"
},
"peripheral_pain_swelling": {
"description": "Caller-assigned peripheral pain/swelling on a 0-10 VAS or NRS (van der Heijde 2009; BASDAI question 3, joints other than neck/back/hips). Number 0-10. magent does not examine the patient.",
"type": "number"
}
},
"required": [
"back_pain",
"morning_stiffness_duration",
"patient_global",
"peripheral_pain_swelling",
"crp_mg_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"
}