Calculation of Twin Birth Weight Discordance

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Birth weight of the smaller twin   grams
Birth weightof the  larger twin    grams
 Birth weight discordance %

A difference of 18% or greater in birth weight should prompt more intensive fetal monitoring [1].

Birth weight discordance =(larger twin weight−smaller twin weight) / larger twin weight×100.

1. Breathnach FM, etal., Perinatal Ireland Research Consortium. Definition of intertwin birth weight discordance. Obstet Gynecol. 2011 Jul;118(1):94-103.PMID: 21691168

All calculations must be confirmed before use. The suggested results are not a substitute for clinical judgment. Neither nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary

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