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Calculator: Trial of labor after cesarean (TOLAC) for use at entry to prenatal care


Calculator: Trial of labor after cesarean (TOLAC) for use at entry to prenatal care

 
Input
 
Maternal age  
Height  
Pre-pregnancy weight  
Obstetric history No previous vaginal deliveries (0)

Previous vaginal delivery before prior cesarean (0.868)

Previous VBAC (1.869)
Arrest disorder at previous cesarean No (0)

Yes (0.597)
On antihypertensive drug therapy No (0)

Yes (0.966)

 
Results
 
Important: Inputs must be complete to perform calculation.

 
 
Probability of successful vaginal delivery   %
 

 
 

 
Notes
  • Due to limited precision in publically available data, there may be small (≤1%) differences between results in this calculator and the results in the online TOLAC calculator provided by the Maternal-Fetal Medicines Units (MFMU).

 
Equations used
 
Terms = (0.056 * Height) + Obstetric history - Arrest disorder at previous cesarean - (0.023 * Maternal age) - (0.024 * Pre-pregnancy weight) - On antihypertensive drug therapy - 5.952
Probability of successful vaginal delivery = 100 * e(Terms) / (1 + e(Terms))

 

 
Equation parameters, such as Obstetric history, have two or more discrete values that may be used in the calculation. The numbers in the parentheses, eg, (0), represent the values that will be used.
 

 
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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