Numerical and structural chromosomal abnormalities represent an important group of pathologic conditions in paediatrics. The basic investigation method is the classical cytogenetic examination under the light microscope.
During the 2010-2012 time period the classical cytogenetic examination was performed in 384 children (204 boys and 180 girls). Pathologic chromosomal abnormality was identified in 35 children (9.1%).
The most frequent indication for karyotyping was presence of congenital anomaly (34.6% of cases) followed by psychomotor and/or mental retardation (33.3% of cases). Classical cytogenetic examination remains in the position of one of the most frequently performed genetic examinations in paediatrics.