Ultrasound is the only safe and reliable method for the diagnosis and assessment of twins. As the chances of pregnancy complications are increased, your ...HomeAboutUsServicesGynaecologyUltrasoundObstetricsUltrasoundHealthTopicsPost-MenopausalBleedingPainfulPeriodsPainfulIntercourseIrregularCyclesHeavyMenstrualBleedingHeavyMenstrualBleedinginYoungGirlsFertilityConcernsGalleryPoguClinicViewEarlyPregnancyScanFirstTrimesterScreeningFetalAnatomySurveyFetalGrowth&WellBeingCervicalLengthAssessment3D/4DUltrasound&PregnancyPelvicUltrasoundSalineInfusionSonographyHyCoSy/HyFoSySonovaginography(SVG)FAQ’sContactUs“Theincidenceofmultiplepregnanciesisontheincreaseastheincreaseinmaternalageandassistedreproductivetreatment.Multiplepregnanciesoccurinabout2-3%ofallpregnanciesandtwinsmakeupmorethan98%ofallmultiplepregnancies.Ultrasoundistheonlysafeandreliablemethodforthediagnosisandassessmentoftwins.Asthechancesofpregnancycomplicationsareincreased,yourObstetricianwouldarrangeformorescansthannormallyoccurwithsingletonpregnancies.”Whatarethemostcommonindicationsforultrasoundintwinpregnancy?Themostcommonindicationsare:ConfirmationofgestationalageDeterminationofzygosity,chorionicityandamnionicityMeasurementofcervicallengthDiagnosisofanomaliesandcomplicationsPlacentallocalisationAssessmentofgrowthandamnioticfluidWhatiszygosity?Zygosityisthemedicalterminologyusedtoindicatethegenetictypesoftwins.Dizygotictwins(Fraternaltwins)wheretwoeggsarefertilizedinthesamecycle.Monozygotictwins(Identicaltwins)whereasingleeggisfertilizedwhichlaterdividetoformtwofetuses.Duringpregnancyitisoftendifficulttodeterminethezygositywithcertaintyunlessoneisaboyandtheotheragirl.Whatischorionicity?Chorionicityreferstothetypeofplacentationintwins.Itisthecriticalinformationnecessaryfortheantenatalmanagementoftwinpregnancies.Therearetwotypesofplacentationintwins:Dichorionicplacentation(80%oftwins)Monochorionicplacentation(20%oftwins)Dichorionictwinshavetwoseparateplacentaethatmaybewidelyseparatedintheuterusorsituatedclos