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Flamm 1997 VBAC Success Score Calculator
x402
Flamm 1997 VBAC Success Score Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Computes the Flamm 1997 VBAC (vaginal birth after cesarean) prediction score (0–10) from five clinical variables and returns the numeric total with published success rates where available.
Price / call$0.005
Success—
StatusUnknown
How this service works
Flamm 1997 admission VBAC score, max 10. Points: age under 40 (+2); vaginal birth none 0, before first cesarean 1, after first cesarean 2, before and after 4; first cesarean not for failure to progress (+1); admission effacement gt_75 +2, from_25_to_75 +1, lt_25 0; dilation >=4 cm (+1). Published success 49% for scores 0-2 and 95% for 8-10; other scores return the total only. Not a trial-of-labor order. magent does not examine the cervix.
Output
Returns the total Flamm 1997 VBAC score (integer 0–10). For scores 0–2, also returns the published success rate of approximately 49%; for scores 8–10, returns the published success rate of approximately 95%. Intermediate scores return the numeric total only without a bracketed success rate, consistent with the original publication.
Example use cases
Obstetric triage VBAC counseling
“A patient presenting in latent labor is 38 years old, has had one prior vaginal birth after her cesarean, her first C-section was done for non-reassuring fetal heart tones (not failure to progress), her cervix is 80 percent effaced, and she's dilated to 5 cm. What's her Flamm VBAC score and predicted success rate?”
High-risk labor and delivery intake
“Score this patient on the Flamm 1997 VBAC rule: she's 42 years old, no prior vaginal births, first cesarean was for arrest of active phase (failure to progress), cervical effacement is 20 percent, and dilation is 2 cm at admission.”
Resident education and case review
“For teaching purposes, calculate the Flamm VBAC score for a patient under 40 with vaginal births both before and after her cesarean, non-failure-to-progress indication, effacement over 75 percent, and dilation of 4 cm — what score and published success rate does that produce?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/flamm_vbacWhen to prefer
Use this endpoint when you need a fast, validated, evidence-based VBAC success prediction at admission for counseling or documentation purposes. It implements the original Flamm 1997 scoring algorithm exactly and clearly flags which score bands have published success rates. Prefer it over manual calculation in any automated obstetric triage, EHR enrichment, or clinical decision-support workflow where reproducibility and auditability matter.
Side effects
- Missing required query parameters (age_lt_40, vaginal_birth, non_ftp_indication, effacement, dilation_ge_4) returns a 400-level error
- Invalid enum value for vaginal_birth or effacement (e.g. a typo) returns a validation error
- Payment failure via x402 protocol returns a 402 response before computation
- Score outside interpretable bands (3–7) returns the total without a success percentage
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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