Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: Can MCV go up by a few points over a month, still in normal range - should we be concerned? All levels listedMale -48 (my husband)WhiteWeight 163No signs/symptomsCan an MCV increase in one month by 3 points?Been seeing doctor since April 2022 for low WBC and neutrophils. Everything else was normal. (found on routine bloodwork)Followed by hematology. They aren't all that concerned, but I have a question.This latest test (50 days after last one) his WBC went back up to 4.3 (previous low 2.8) and neutrophils are 2.5 (previous low 1.4).Of course now I see that his MCV went up to 95.8 from 92,8, before that 93.8 (still normal, ref high is 100)MCH stayed same at 32.5 (norm)MCHC went down from 34.5 to 33.6 (normal, ref low is 31)RDW 12.6 stayed same (norm)RBC went from 4.64 to 4.53 (still normal, ref low is 4.2)Hemoglobin went from 14.9 to14.6 (still norm, ref low is 13)Platelets, all other counts normal for him.Normal B12, Folate normal at 29.4Are these counts any cause for concern? Can they go up and down within range?He's had 4 blood tests within 3 months so I can see the fluctuations. Also to note, he's having heel pain/inflammation starting last week (from running we think). They did test for RA due to strong family history (dad and brother) but negative. Although doctor said that doesn't mean he's not developing it.And he has been eating a lot less healthy this month and gained some weight.. ### Response: This change is within normal lab variation. Nothing to worry about..