The authors report data from the follow-up of 167 pregnancies in the Medical Genetic Counseling in Varna for the period 1996-2001. In 44% of the cases a primary prevention was aimed. It was established that parental age was the most common indication for prenatal diagnostics (PD) - in 29% of the pregnancies. It was followed by the effects of drugs and/or infectious agents (in 14%), impaired reproduction (in 12%), neural tube defects (in 11%), chromosomal diseases (in 8%), multiple anomalies (in 7%) and single gene disease (in 3%). PD under the indication of'other diseases' was carried out in 16% of the pregnancies. Data were compared to those reported by the authors for the period 1983-1987. It is emphasized that PD is a unique preventive method of a high social value.
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