Thanks for contacting HCM You recently had blood work done and I am assuming the results were from a complete blood count. The MO is the number of monocytes and your numbers are only marginally low and are of no concern. The NRBC is the number of nucleated red blood cells. These are blood cells that are prematurely released into the blood stream with the nucleus still intact. This is only slightly high and not a real concern. It would help if you included all the values so we can give you a more accurate reading on your results Hope I answered your question. Please contact us again with your medical questions or concerns