Q90-Q99: Chromosomal abnormalities, not elsewhere classified

Q95: Balanced rearrangements and structural markers, not elsewhere classified

The conditions grouped under "Balanced rearrangements and structural markers, not elsewhere classified," typically refer to chromosome abnormalities. Chromosomes, which are found in the cells of our bodies, carry genetic information. In balanced rearrangements, the structure of a chromosome has changed, but there is no loss or gain of genetic material, which means that it often does not cause health problems. However, in some cases, it can still lead to issues regarding growth, development, or reproduction if it disrupts critical genes. On the other hand, structural markers indicate that there is an unusual structure to a person's chromosomes, which could potentially lead to health complications, particularly if genetic material is missing or duplicated. Some common signs of these conditions can include physical abnormalities, developmental delays, and infertility. These conditions are usually hereditary, passed down from parents to children through their genes.