Abstract
Objective: To determine the frequency of clinical features and cytogenetic abnormalities in patients of down syndrome and correlation of cytogenetic abnormalities with clinical features.
 Study Design: Cross sectional study.
 Place and Duration of Study: Department of Haematology, Armed Forces Institute of Pathology, Rawalpindi, from Feb 2017 to Feb 2018.
 Methodology: Total 163 patients with clinical suspicion of Down syndrome were selected by non-probability convenient sampling and diagnosis was confirmed by conventional cytogenetic analysis using Giemsa trypsin banding technique. Clinical features were assessed and frequency of different cytogenetic abnormalities were noted.
 Results: Out of total 163 patients, 96 (59%) were male and 67 (41%) were female. Median age of the patients was 11 months. Trisomy 21 was detected in 158 (96.9%), Robertsonian translocation in 4 (2.4%) and mosaicism in 01 (0.6%) patient. The predominant clinical features observed were slaunted with eyes, epicanthic folds, depressed nasal bridge and protruding tongue.
 Conclusion: Trisomy 21 is the most common cytogenetic abnormality observed in patients of down syndrome.
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