Transfused bc of ferritin low for a year. Was 22-36. Hgb minor low at 11. Iron was ok but stored iron (ferritin) low. Told I wasn’t absorbing. My rbcs are low (due to smoldering myeloma) with erythropoietin high, meaning kidneys trying but failing to increase rbc production. Very symptomatic with cold feet, cold, leg aches, esp at night(fewer circulating rbcs that carry oxygen), lowered o2 sats at night even on cpap, extreme fatigue. So I have iron deficiency, mild anemia. Everyone presents differently. I’m still waiting to see if iron infusions help. I’m told it takes about 6 weeks to feel difference. It may not help if there’s another etiology of my problems like the smoldering myeloma. Thanks for the question. All the best to you.