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Liz,
We only collect adults and use actual body weight in determining how much to collect. We have a simple format we follow for collecting: 2 million CD34+/kg is minimum dose and goal is 5 for collection for each transplant. In cases where we collect for 2 transplants (mostly myeloma), the minimum we would want to collect is 4 and our goal is 10. We only use Plerixafor if we cannot mobilize a patient through usual methods (G-CSF only or G-CSF plus chemo). We had one special circumstance when we used it on a patient who had radiation to the pelvic area and was treated with many cycles of lenalidomide for myeloma (which has caused us to fail mobilization a few times when last treatment was done with close proximity to mobilization). We managed to get enough cells for two transplants with that one.
Ann