Treatment of Anemia with Elevated MCV and MCH

Initial Diagnostic Workup

The combination of elevated MCV and MCH most strongly suggests vitamin B12 or folate deficiency, though this pattern can also indicate myelodysplastic syndrome, hemolysis, or mixed deficiency states, according to the American College of Physicians 1
Vitamin B12 and folate levels are essential to identify macrocytic deficiency, as recommended by the American College of Physicians 1
Serum ferritin and transferrin saturation are necessary to assess iron status and identify coexisting iron deficiency, as suggested by the American College of Physicians 1
Reticulocyte count is critical for distinguishing between deficiency states versus hemolysis or bleeding response, according to the American College of Physicians 1
CRP is used to identify inflammation that affects ferritin interpretation, as recommended by the American College of Physicians 1
Haptoglobin and LDH are used to assess for hemolysis if reticulocytes are elevated, according to the American College of Physicians 1

Oral folic acid supplementation is the standard treatment for isolated folate deficiency, as recommended by the American College of Physicians 1
Immediate treatment is critical to prevent irreversible neurologic damage, similar to B12 deficiency, according to the American College of Physicians 1
For patients with MDS-related macrocytic anemia, lenalidomide should be given to individuals with del(5q) cytogenetic abnormality, as recommended by the National Comprehensive Cancer Network 2
Erythropoietin therapy is recommended for patients with normal cytogenetics, <15% marrow ringed sideroblasts, and serum erythropoietin levels ≤500 mU/mL, according to the National Comprehensive Cancer Network 2
G-CSF addition should be considered if no response occurs with erythropoietin alone, as suggested by the National Comprehensive Cancer Network 2
RBC transfusion support using leukopoor products is recommended for symptomatic anemia, according to the National Comprehensive Cancer Network 2
Azacitidine or decitabine is recommended for higher-risk MDS patients, as suggested by the National Comprehensive Cancer Network 2

Serial monitoring of MCV, MCH, and reticulocyte count helps assess response to vitamin or iron replacement, as recommended by the American College of Physicians 3

Immediate hematology consultation is required if the cause remains unclear after complete workup, according to the American College of Physicians 1
Suspicion for myelodysplastic syndrome exists, as recommended by the American College of Physicians 1
Hemolytic anemia is confirmed, according to the American College of Physicians 1
Pancytopenia is present, as suggested by the American College of Physicians 1
No response to appropriate vitamin or iron replacement after 2-3 weeks, according to the American College of Physicians 1

Do not overlook coexisting deficiencies - mixed iron and vitamin deficiency can occur simultaneously and requires treatment of both, as recommended by the American College of Physicians 1
Verify iron repletion before instituting erythropoietin therapy in MDS patients, according to the National Comprehensive Cancer Network 2