Tested on Gulf Medical Boards (DHA, SMLE, MOH & HAAD)
Clinical calculations and diagnostic scoring systems like VBAC / TOLAC Success Predictor (MFMU) frequently appear on Prometric exams. Master high-yield clinical vignettes with instant AI-powered pathophysiology rationales.
What is the VBAC / TOLAC Success Predictor (MFMU)?
The VBAC / TOLAC Success Predictor (MFMU) is an evidence-based clinical decision rule engineered to quantify diagnostic probability, stratify clinical severity, and guide therapeutic decision-making in obstetrics & gynecology practice. The Maternal-Fetal Medicine Units (MFMU) Network model predicts the individualized likelihood of a successful trial of labor after cesarean (TOLAC) resulting in a vaginal delivery (VBAC), aiding shared obstetric decision-making. Clinical scoring tools like VBAC / TOLAC Success Predictor (MFMU) are essential in acute and outpatient management, enabling clinicians to objectively differentiate between low-risk candidates suitable for conservative therapy and high-risk patients requiring urgent interventions. Verified against current 2026 clinical standards, this tool is extensively tested on Gulf health authority licensing exams including DHA (Dubai), SMLE (Saudi Arabia), MOH, HAAD/DOH (Abu Dhabi), OMSB (Oman), and QCHP (Qatar).
💡Clinical Pearls & Diagnostic Utility
Aids patient-centered counseling regarding the risks and benefits of trial of labor after cesarean vs. planned elective repeat cesarean section.
Formula & Calculation Parameters
The mathematical equation and clinical variables required to calculate VBAC / TOLAC Success Predictor (MFMU):
Score Interpretation & Clinical Stratification
| Score Range | Clinical Interpretation | Risk Tier |
|---|---|---|
| ≤ 59.9 | Low / Guarded VBAC Likelihood (< 60%) | orange |
| 60 – 69.9 | Moderate VBAC Likelihood (60% - 69%) | yellow |
| ≥ 70 | Favorable VBAC Success Probability (≥ 70%) | green |
When to Exercise Caution
Validated for individuals with one prior low transverse cesarean section; does not assess uterine rupture risk directly (baseline rupture risk ~0.5% - 0.9%).
Clinical Review Board
Dr. Muhammad Nouman, MBBS
Capital Medical University | PMDC Reg No: 117744-P
Clinical Audit Status
✓ Verified for 2026 Guidelines
Last updated: 2026-08-07
Peer-Reviewed Medical Literature
- •Grobman WA, et al. Development of a nomogram for prediction of success of trial of labor by patients with a previous cesarean delivery. Am J Obstet Gynecol. 2007;197(5):499.e1-6.
- •ACOG Practice Bulletin No. 205: Vaginal Birth After Cesarean Delivery. Obstet Gynecol. 2019;133(2):e110-e127.
Related Obstetrics & Gynecology Calculators & Scoring Tools
Explore related clinical calculators, risk stratification indexes, and diagnostic scoring algorithms in Obstetrics & Gynecology:
Estimated Due Date (EDD)
Calculates the Estimated Due Date (EDD) using Naegele's rule.
Bishop Score
Assesses cervical readiness for labor induction.
Gestational Age & Pregnancy Milestones
Calculates pregnancy trimester, days to delivery, and clinical milestones.
New Ballard Score (Gestational Age)
Estimates gestational age of newborns via physical and neuromuscular exam.
Hadlock Estimated Fetal Weight (EFW Sonographic Biometry)
Calculates Estimated Fetal Weight in grams and lbs from 4-parameter ultrasound biometry (BPD, HC, AC, FL).
fullPIERS Model for Adverse Preeclampsia Outcomes
Predicts risk of severe adverse maternal outcomes within 48 hours in preeclampsia.