[tri-med] Re: mosaic vs. full trisomy

Does anyone know how many cells etc that
> need to be counted to rule out mosaicism? Does anyone know from their own
> testing?

A good site for learning about mosaicism, and resource material on most of
the chromosomes, is:

http://www.medgen.ubc.ca/wrobinson/mosaic/index.htm

This might sound strange, but the level of mosaicism can vary according to
what gets tested. For example, blood could show 5%, but skin could show 100%
of the cells are carrying trisomic cells, or vice versa. Stuff like that.
Also, even weirder, mosaic kids have been tested as they've aged and the %
of trisomic cells in the blood can actually drop.

So far, Warren's blood tests have all come back as a 50/50 split. Nothing
else has been tested, but the next time we see the geneticist, I'm going to
ask if they can do a skin test.(a swab with a Q-tip from inside the mouth,
no pain) just to satisfy my own curiousity.

Wendy
mom to Ryan, James, and Warren (9) mT15r
BC, Canada

                  Building ___ooOOoo__ Rainbows
                       www.trisomyonline.org
                  Families Helping Families On-line

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