I don't know.  I think I remember that there needs to be something like a five year period between.  The five years might be the result of some confusion but it's a figure that's been in my brain a long time.

I'll be interested to see if someone knows.  Good question.

Blessings

I would be pretty sure there is no limit. I donated twice to Hamish, and his current donor has also donated before. There is a 12 month period between minimum (as Pam said) which also applies to the donor donating blood ... this is all precautionary since they really don't know the effect other than guessing it is nothing. The bone (for hip harvest) heals readily and the stem cells themselves are back to normal levels within a month, so arguably there is no reason that you couldn't donate under the 12 month period again.

I know it is unusual to match more than once so it is unlikely that you would be doing it multiple times anyway.

Sandra