Fluorescence in situ Hybridization (FISH)
2.0 mL (min. 1.0 mL) peripheral blood in sodium heparin preferred, EDTA accepted
1.0 mL (min. 0.5 mL) bone marrow in sodium heparin preferred, EDTA accepted
5 mm^3 fresh tissue or 3.0 mL (min. 2.0 mL) FNA in MPLN RPMI media
Whole blood and bone marrow, ship ambient
Fresh tissue or FNA ship in a Styrofoam container with a cool/refrigerated pack (Do not allow cool pack to directly contact sample)
Clotted specimen; Specimen exposed to extreme temperature; Anticoagulant toxic to cells; Insufficient number of cells
In a normal cell a two green, two aqua and two orange signal pattern is observed. In an abnormal cell containing hyperdiploidy of either chromosome 5, chromosome 9 or chromosome 15, greater than two signals is observed for the respective chromosomes.
Aneuploidy is a frequent finding in plasma cell myeloma. Approximately 60-70% of myeloma cases have been reported to have hyperdiploid clones. About 10-20% have been reported to have pseudodiploid clones, and 10-30% have been reported to have hypodiploid clones. FISH can detect these abnormalities and interphase and metaphase cells.