Full blood count

Hi i recently had a full blood count test and have been looking at my results and noticed my red cell distribution width (RDW) is 14.7%. I have read that a high rdw can be a sign of a vitamin b12 deficiency.

My RDW is 14.7% but normal range is 11.0-14.8 and my mean cell volume (MCV) is 89, normal range 80-100.

Just worried about my RDW been in the high range. I have graves disease and looking back at past blood results my RDW was 16.6% when i was first diagnosed so has gone down.