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It is data on your red blood cells.
MCV means Mean cell volume. It shows the average volume of a red blood cell in femtoliters. Today, it is actually physically measured with a laser :-)
I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)