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Count
Additional Cells
Description
Most cells may be counted in addition to a routine chromosome analysis
to rule out chromosomal mosaicism. Ten to eighty additional cells
will be counted to look for evidence of the presence of two or more
different cell lines with different modal chromosome numbers. Additional
cells are counted at the discretion of the cytogenetic laboratory
director.
Indications
• mosaic sex chromosome abnormalities
• mosaic autosomal trisomies
• mosaic structural rearrangements
• abnormal bone marrow or unstimulated peripheral blood with
multiple abnormal clones and/or multiple complex chromosome rearrangements.
Specimen Requirements
Additional cells are counted on chromosome spreads that have already
been prepared from a submitted specimen. Usually no further specimen
is required.
Reference Value
46,XX or 46,XY
Turn Around Time
Depends upon the type of specimen. Does not significantly increase
the usual turnaround time for a specimen.
CPT Codes
88285 - chromosome analysis, count additional cells
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