International Journal For Multidisciplinary Research

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A Widely Indexed Open Access Peer Reviewed Multidisciplinary Bi-monthly Scholarly International Journal

Call for Paper Volume 8, Issue 2 (March-April 2026) Submit your research before last 3 days of April to publish your research paper in the issue of March-April.

Subclinical Vitamin B12 Deficiency Presenting with isolated Red Cell Distribution Width (RDW) elevation without anemia in 20 years old female: A Rare hematological presentation : Case Study

Author(s) Mrs. Phool Lodhi
Country India
Abstract Megaloblastic anemia and neurological symptoms are common signs of vitamin B12 deficiency. However, the lack of traditional clinical and hematological findings may cause the condition to go undiagnosed in its early or subclinical stage. Before anemia develops, subtle changes in red cell indices, especially red cell distribution width (RDW), may act as early markers of compromised erythropoiesis.
This case study details a 20-year-old female patient who had mild, nonspecific fatigue and a rare presentation of subclinical vitamin B12 deficiency. Except for a single elevation in RDW, routine hematological analysis showed normal hemoglobin concentration, mean corpuscular volume, and other red cell parameters. Mild anisocytosis was revealed by peripheral smear analysis. Iron tests and other biochemical parameters were within normal ranges, but additional testing revealed decreased serum vitamin B12 levels.
Early detection of vitamin B12 deficiency allowed for the timely start of supplementation, which stopped the development of neurological issues and overt anemia. The diagnostic value of isolated RDW elevation as an early hematological indicator of subclinical vitamin B12 deficiency is demonstrated by this case.
Keywords Keywords: Vitamin B12, Red Cell Distribution Width (RDW), Megaloblastic anemia, Anisocytosis, Erythropoiesis.
Field Medical / Pharmacy
Published In Volume 8, Issue 1, January-February 2026
Published On 2026-02-05

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