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This routine complete blood count doesn't say anything about either arthritis or lupus. All is shows is a slightly low red blood cell count (RBC) with a slightly high mean corpuscular volume (MCV). Any number of things can cause that, the most common being deficiency in vitamin B12. This is a type of macrocytic anemia.
Please let me know what questions you have about this.
There is no way to tell from a blood count why you are hurting. This is just a very routine test done at every physical. Usually in lupus, white blood cells are low as well.
No doubt your doctor will want to run ESR (erythrocyte sedimentation rate) and ANA (antinuclear antibody) test as well as RF (rheumatoid factor) and C-Reactive protein. These are the tests needed to check for either disease.