Raised Nuchal translucency measurement is associated with adverse pregnancy outcome. One in three fetuses are affected by it. Live birth in this group where there is no aneuploidy is around 3.7%.

This study aims to observe the spectrum of Prenatal Diagnosis of Rare Genetic conditions at a Tertiary care hospital in Karachi. This is a retrospective review conducted at the Aga Khan University Hospital, Karachi from January 2016 to July 2018. All cases undergoing invasive testing by Chorionic villus sampling for indications other than Thalassemia were included. Forty percent of patients in our cohort underwent invasive testing for muscular dystrophies particularly survival motor neuron (SMN) gene deletion and 32% for Cystic Fibrosis. Other rare disorders like JAM 3 mutation, PEX 1 gene, Barters Syndrome, Wardenberg, Bardet-Beidl Syndrome and Lissencephaly accounted for 28%. Sophistication in laboratory technology and DNA banking has improved the prenatal diagnosis of rare genetic disorders particularly SMN gene deletion. Integrated care involving foetal medicine specialist, Paediatric geneticist, and dedicated Laboratory personnel improves Counseling and Diagnosis of rare genetic conditions. Provision of dedicated nursing staff along with strengthening of welfare facility for nonaffording patients would improve the uptake of invasive testing.

There is a prognostic value of UAD in predicting the outcomes for FGR fetuses and therefore recommend its use in the conservative management of such pregnancies to reduce perinatal mortality and morbidity.

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