Are microdeletion fluorescent in situ hybridization (FISH) tests always ordered with a constitutional peripheral blood karyotype study?
A FISH test for a microdeletion syndrome is always done in conjunction with a routine chromosome analysis unless a karyotype has already been obtained in the recent past. FISH alone will not reveal other deletions or chromosomal rearrangements that may exist. Both tests can be processed from a single green top blood specimen.
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