Short answer · Medically reviewed summary · Last updated: 2026-05-08
Triploidy is a rare chromosomal condition where an individual has three complete sets of chromosomes instead of the usual two, resulting in 69 chromosomes. The ICD-10 code for Triploidy is Q92.8 (Other specified trisomies of autosomes), while the historical ICD-9 code is 758.5 (Other conditions due to autosomal anomalies). What is the clinical definition of Triploidy? Triploidy occurs when a fetus has 69 chromosomes, typically due to dispermy (two sperm fertilizing one egg) or a failure in the division of maternal or paternal gametes.
Triploidy is a rare chromosomal condition where an individual has three complete sets of chromosomes instead of the usual two, resulting in 69 chromosomes. The ICD-10 code for Triploidy is Q92.8 (Other specified trisomies of autosomes), while the historical ICD-9 code is 758.5 (Other conditions due to autosomal anomalies).
Triploidy occurs when a fetus has 69 chromosomes, typically due to dispermy (two sperm fertilizing one egg) or a failure in the division of maternal or paternal gametes. Because this condition involves an entire extra set of genetic material, it is incompatible with life, and the vast majority of cases result in early miscarriage or stillbirth. Among the 33 members of the DiseaseMaps community who have shared their experiences with Triploidy, the focus remains on the profound emotional impact of pregnancy loss and the need for specialized bereavement support.
Diagnosis of Triploidy is typically achieved through prenatal testing, such as amniocentesis or chorionic villus sampling (CVS), which allows for karyotype analysis of fetal cells. Ultrasound findings often reveal structural anomalies, such as severe intrauterine growth restriction, enlarged placenta, and various organ malformations, which prompt further genetic investigation.
Triploidy is generally not considered an inherited condition. It is a sporadic chromosomal error occurring during fertilization or early cell division. Because it is not caused by a gene mutation passed down from parents, the risk of recurrence in future pregnancies is typically very low, similar to the general population risk.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.