Trisomy 13 is confirmed by examining the infant's chromosomal pattern through karyotyping or another procedure.
Karyotyping involves the separation and isolation of the chromosomes present in cells taken from an individual.
Definitive diagnosis is achieved through karyotyping, which involves drawing the baby's blood for a microscopic examination of the chromosomes.
Chromosome analysis, also called karyotyping, involves staining the chromosomes and examining them under a microscope.
This is why they are extremely wary of any invasive fetal karyotyping.