Chromosomal abnormalities are differences in the chromosomes that can happen during embryonic and fetal development. They could be "de novo" (unique to the fetus) or inherited from a parent.

The American Academy of Pediatrics has released new guidance stating that the genetic disorders Trisomy 13 and 18 are not ...

Patau’s syndrome, also referred to as Trisomy 13, is a chromosome-based, rare genetic disorder in which the some or all of a patients cell contain an extra copy of chromosome 13. Normally a baby ...

Abnormal Karyotypes and Subtypes of 13–15 Complements (Type C). An assumed total chromosome number of 45 was found in the maternal grandfather, 2 great-aunts, 1 aunt and the index patient (Table 1).

Each chromosome has a short and a long arm. Chromosomes 13, 14, 15, 21, and 22 have a very short arm, which doesn’t contain any unique genetic material, and are called acrocentric chromosomes.

37 CA repeats, 5 STSs, 9 ESTs, and 4 genes were mapped to 19 different intervals of chromosome 13 determined by the cytogenetic breakpoints of 19 different cell lines with interstitial deletions ...

Microarray-Based Prenatal Diagnosis for the Identification of Fetal Chromosome Abnormalities Lisa G Shaffer; Jill A Rosenfeld Disclosures Expert Rev Mol Diagn. 2013;13 (6):601-611.

A routine genetic screen using cell-free DNA—a highly accurate blood test—suggested her fetus had an extra copy of chromosome 13 (Patau syndrome) and only one copy of chromosome 18.

At 13 weeks and 6 days, it can be up to 2.8 mm. If your baby’s measurements are within this range, they have a low chance of having Down syndrome or other genetic disorders.