Dicentric

i would try a FISH experiment. Since a Robertsonian translocation is a dicentric fusion and the acentric parts fragment will be lost, you should be able to detect a Robertsonian translocation using probes for ed 14 & 21 (you'll find only 1 strand of both ...

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... the ELF and RF range led to significant increases in chromosomal abnormalities in human fibroblasts (skin cells), such as gaps, breaks, rings, dicentric (two centromeres) chromosomes and fragments. Gaps increased 4-fold, breaks 2-fold, and dicentric chromosomes and acentric fragments 10-fold. ...

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in a robertsonian translocation actually a dicentric chromosome is created, but they act as one centromere.

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