Some lab values

I got the results of the tests done Monday at Duke. The full report was faxed to my office, and I haven’t seen it yet, but here’s what I have so far.

M-Spikes (I have two m-spikes)

Last month: 0.19 and 0.12 g/dL (Total is 0.31 g/dL)
This month: 0.16 and 0.22 g/dL (Total is 0.38 g/dL)

Immunoglobulin Profile

Last month: IgA 374 mg/dL Reference: 46-287
This month: IgA 465 mg/dL Reference: 46-287 (up 91)
Last month: IgG 709 mg/dL Reference: 588-1573
This month: IgG 603 mg/dL Reference: 588-1573 (down 106)

I have July and August here. Needless to say, I was fervently hoping for a drop in the IgA and an increase in the IgG.  The one good thing is that the IgG is still in the normal range, where it has never been since I learned I had MM.  It was usually below 300 mg/dL.

Can someone give me a good explanation about why I have two m-spikes? I’ve asked doctors about a zillion times, and I have either forgotten what they told me or didn’t understand it well enough to even remember.