Table 1.

Number of ring cases reported to overall number of karyotypes at the three Romanian laboratories.

Laboratory	Number of karyotype	Number of Autosome Rings	Time
Cytogenetic Laboratory “Grigori T. Popa”, University of Medicine and Pharmacy, Iasi	5051	3	1965–2011
Cytogenetic Laboratory, “Professor Dr. Alfred Rusescu”, Institute for Mother and Child Care, Bucharest	2277	3	1986–2011
Cytogenetic Laboratory, “Dr. Gug”, Timisoara	3173	0	2002–2011
Total	10501	6