Reticulocyte Hemoglobin vis-a-vis Serum Ferritin as a Marker of Bone Marrow Iron Store in Iron Deficiency Anemia

Abstract

Aim: To evaluate reticulocyte hemoglobin (RET-He) vis-a-vis serum ferritin as a marker of bone marrow iron store in iron deficiency anemia (IDA).

Material and methods: A hospital based analytic study was conducted among patients (age group 15-65 years) with newly diagnosed and untreated IDA admitted in medicine ward and not suffering from any inflammatory disorders (excluded by C-reactive protein). Patient having other forms of anemia/ hemoglobinopathies/ malignancy, MCV > 80 fL and pregnant female were excluded. All patients were subjected to automated CBC, RET-He, iron studies and iron staining of bone marrow aspirates.

Results: Total 142 patients were included. Of these, 42 patients were excluded due to aparticulate bone marrow aspirate. Remaining 102 patients were classified in to Group A (grade 0 and 1-depleted iron stores) and Group B (grade 2 and 3 - functional iron deficiency). There were significant difference in means of RET-He (Group A 17.84 ± 2.39 vs. Group B 25.08 ± 4.42; P< 0.0001) and serum ferritin (Group A 8.68 ± 2.80 vs. Group B 15.61 ± 4.68; P < 0.0001). We observed significant positive correlation of ferritin with RET-He in total patients (r = 0.7860, p 0.0000), Group A (r = 0.7089, p 0.00) and Group B (r = 0.4675, p < 0.05) patients. RET-He was the only significant predictor of bone marrow iron stores (at P < 0.05). On ROC curve analysis, the AUC for RET-He was found to be 0.894 (P value < 0.01) and best cut off value for predicting IDA was 22.4 pg (sensitivity 98.88%, specificity 84.21%). The AUC for serum ferritin was 0.891 (P value < 0.01) and best cut off value for predicting IDA was 11.6 ng/ml (sensitivity 86.75%, specificity 89.47 %).

Conclusions: RET-He correlated significantly with serum ferritin and is also a better predictor of bone marrow iron stores than the latter.