Patients with twin pregnancies are at increased risk for preterm birth. Several studies, including our own, have demonstrated that a short cervical length on ultrasound as well as a positive fetal fibronectin test increases the risk of preterm birth in twin pregnancies.

Based on data from over 600 asymptomatic patients with twin pregnancies in our high-risk practice, we have created an online calculator to help patients with twin pregnancies and their providers assess the risk of preterm birth based on the gestational age, cervical length measurement, and fetal fibronectin results from 22 0/7 – 31 6/7 weeks [1]

[1] Fox NS, Saltzman DH, Fishman A, Klauser CK, Gupta S, Rebarber A. Gestational age at cervical length and fetal fibronectin assessment and the incidence of spontaneous preterm birth in twins. J Ultrasound Med 2015; 34(6):977-84

  • DISCLAIMER AND TERMS OF USE

    Use of the twin preterm birth calculator requires you read and agree to the following:

    This calculator is a tool that you may use that can give you an indication of when you may deliver your twin pregnancy. However, please realize that THIS SITE AND THIS TOOL SHOULD NOT BE RELIED UPON – it is a guide only, and DOES NOT PROVIDE MEDICAL ADVICE. This site and the tool are not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any question you may have regarding your pregnancy or other medical condition. Never disregard professional medical advice or delay in seeking it because of this tool or something you have seen on this site. The use of this site and this tool, and reliance upon information and content obtained through this site is solely at your own risk .

    The tool on this site is protected by copyright under law. It may be used for personal use only, and may not be used in any commercial manner or for anyone other than yourself.

    In no event shall MFMA, its owners, principals, employees, representatives, agents or affiliates ("MFMA") be liable for any damages (including, without limitation, incidental and consequential damages, personal injury/wrongful death to myself and my unborn child/ren) resulting from the use of or inability to use this site or the Content, whether based on negligence, warranty, contract, tort, or any other legal theory, and whether or not MFMA is advised of the possibility of such damages. Any claims arising in connection with your use of the Site or the tool or any Content must be brought within one (1) year of the use of the site first giving rise to such action occurred. Remedies under these Terms and Conditions are exclusive and are limited to those expressly provided for in these Terms and Conditions.

    To protect your privacy, you agree that you will not submit any Personally Identifiable Information of you or of anyone else.

    MFMA is based in New York, New York, in the United States of America You expressly agree that exclusive jurisdiction for any dispute with MFMA, or in any way relating to your use of the MFMA Site, resides in the courts of the State of New York, County of New York, and you further agree and expressly consent to the exercise of personal jurisdiction in the courts of the State of New York, County of New York in connection with any such dispute including any claim involving MFMA. These Terms and Conditions are governed by the internal substantive laws of the State of New York, without respect to its conflict of laws principles. If any provision of these Terms and Conditions is found to be invalid by any court having competent jurisdiction, the invalidity of such provision shall not affect the validity of the remaining provisions of these Terms and Conditions, which shall remain in full force and effect. No waiver of any of these Terms and Conditions shall be deemed a further or continuing waiver of such term or condition or any other term or condition.

    These Terms and Conditions constitute the entire agreement between you and MFMA with respect to the use of the MFMA Site, tool and content.