Reduced GBAS calculator
Gestational age and five MRI findings.
Select each category to calculate the combined score.
Assessment
6 componentsPMA = postmenstrual age at MRI, in decimal weeks (weeks + days / 7). Enter biometric categories after correction; GA at birth is a separate component.
Use & interpretation
This investigational calculator implements the reduced score described in the supplied study materials. It is intended for research and evaluation by trained professionals. It has not been established here as a validated standalone clinical decision tool. Do not use the score alone for diagnosis, treatment decisions or individual prognosis.
The total is the sum of the six displayed contributions. MRI option values already include their weights: do not multiply them again. Mild, Moderate and Severe refer to the reduced score categories, not the original GBAS categories. No individual outcome probability is calculated.
Scoring provenance & brief references
Reduced score weights, biometric corrections and GA groups follow the supplied CEPAS presentation (scoring slides). GA groups use completed weeks: 23–26, 27–29 and 30–33. No category is assigned outside 23–33 weeks. Classification thresholds: Mild 0–4, Moderate 5–7, Severe ≥8, as specified for this calculator.
Kidokoro H, Neil JJ, Inder TE. New MR Imaging Assessment Tool to Define Brain Abnormalities in Very Preterm Infants at Term. AJNR. 2013;34:2208–2214. doi:10.3174/ajnr.A3521. This reference describes the original MRI assessment; it does not validate this reduced model or its GA weights.
Visual references: the 13 supplied images, reproduced without alteration. Interpret examples together with the scoring criteria and the full MRI examination.