The measurement of the M-protien is in grams per liter. So if your liters drop down... your measurement of protein per liter is going to go up. 1 liter = 2.11 pints. So losing a pint of blood means that you will be losing 1/2 a liter. Mine did hardly move, from .3 to .5 g/dl.
The measurement of light chains however is.. milligrams per liter so it would seem that this might have a larger absolute amount since the unit of measurement milligrams is smaller than grams. Losing 1/2 a liter of blood from the body may have had a slight effect. My results seemed wrong since I am IGM-kappa, you would expect to see an increase in Kappa and a stable Lambda. Instead my Lambda went way down. That would seem to be wrong. Since this blood test it came up.
Now of course I had these blood tests about six to eight weeks after the blood donation and frankly it is questionable as to whether, at that point, there would have been any real difference. But the absolute minimum between blood donations is sixty days and that is right at the edge of when these tests were done.
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