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BUN/Creatinine Ratio Calculator (Richards 1990)
x402
BUN/Creatinine Ratio Calculator (Richards 1990) 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 BUN-to-creatinine ratio and flags whether it meets the Richards 1990 threshold (≥36) suggesting upper gastrointestinal bleeding.
Price / call$0.005
Success—
StatusUnknown
How this service works
Richards 1990 BUN/creatinine ratio as bun_mg_dl / creatinine_mg_dl, rounded to one decimal. A ratio of 36 or greater suggests upper gastrointestinal bleeding. A ratio below 36 is not helpful in locating the source and is not a lower-GI class. Provide creatinine_mg_dl (0.1-20) or creatinine_umol_l (9-1768), not both. Not a diagnosis, endoscopy order, or Blatchford urea band. magent does not locate a bleed.
Output
Returns the BUN/creatinine ratio rounded to one decimal place, along with an indication of whether the ratio is ≥36 (suggestive of upper GI bleeding per Richards 1990). Does not provide a diagnosis, endoscopy order, or localization of the bleeding site.
Example use cases
ED triage for GI bleed source
“My ED patient has a BUN of 72 mg/dL and a creatinine of 1.8 mg/dL — calculate the BUN to creatinine ratio and tell me if it hits the Richards 1990 cutoff of 36 suggesting upper GI bleeding.”
ICU lab review with SI units
“I have a creatinine of 115 µmol/L and a BUN of 28 mg/dL for my ICU patient — compute the BUN/creatinine ratio for me and flag whether it's above or below 36.”
Hospitalist rounding decision support
“Can you work out the Richards BUN/creatinine ratio for a BUN of 90 mg/dL and creatinine of 2.5 mg/dL, and let me know if that's consistent with an upper GI source?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/bun_creatinine_ratioWhen to prefer
Use this endpoint when you need a fast, single-call computation of the Richards 1990 BUN/creatinine ratio from discrete lab values. Prefer it when your agent already holds BUN and creatinine values and needs to apply the ≥36 threshold for upper GI bleeding risk stratification. If you need Glasgow-Blatchford scoring or ADHERE CART classification, use the corresponding sibling endpoints instead.
Side effects
- Both creatinine_mg_dl and creatinine_umol_l provided simultaneously — endpoint rejects the request
- BUN value outside 1–200 mg/dL range — validation error
- Creatinine mg/dL outside 0.1–20 range or µmol/L outside 9–1768 — validation error
- Missing required bun_mg_dl parameter — returns error
- Non-numeric input for numeric fields — returns error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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