Essentials – Megaloblastic Anemia
Sep 11, 2026 · 25 min · 10 segments
Megaloblast. Now there’s a word you don’t hear every day. The root *-blast* comes from the Greek *blastos*, meaning “germ” or “bud,” and is familiar from terms like *blast cells*—very young…
Megaloblast. Now there’s a word you don’t hear every day. The root *-blast* comes from the Greek *blastos*, meaning “germ” or “bud,” and is familiar from terms like *blast cells*—very young hematopoietic precursor cells. *Megalo-* comes from the Greek *megas*, meaning “large” or “great,” as in *splenomegaly*. So is a megaloblast simply a large, immature cell? Not quite. In this episode, we break down megaloblastic anemia: why it develops, what vitamin B12 and folate have to do with it, what you’ll see on a CBC and peripheral smear, and how to recognize and treat the underlying problem. After listening to this AudioBrick, you should be able to: - Explain the pathogenesis of megaloblastic anemia. - Identify common causes of vitamin B12 and folate deficiency and distinguish their associated nonhematologic findings. - Recognize the characteristic complete blood count findings seen in megaloblastic anemia. - Describe and identify the characteristic morphologic changes in the peripheral blood and bone marrow. - Explain the principles of treatment for megaloblastic anemia. You can also explore the original **Megaloblastic Anemia** Brick from our Hematology collection, available free here: https://usmle-rx.scholarrx.com/rx-bricks/brick/CP\_HEM0022 Want to explore more Rx Bricks and USMLE-Rx resources? **Start your free USMLE-Rx trial** and get five full days of access to **Rx360+**, including Qmax, Rx Bricks, Flash Facts, and Express Videos. https://usmle-rx.com/free-trial/ After your trial ends, you can continue accessing **over 150 free Rx Bricks**, including the complete **General Microbiology** and **Cellular and Molecular Biology** collections. If you enjoyed this episode, we’d appreciate a review on **Apple Podcasts**: https://podcasts.apple.com/us/podcast/the-rx-bricks-podcast/id1530646481 Reviews help more medical students and future physicians discover the Rx Bricks Podcast. Follow **USMLE-Rx**: Facebook: https://www.facebook.com/usmlerx Instagram: https://www.instagram.com/usmlerx/ X: https://x.com/usmlerx Threads: https://www.threads.net/@usmlerx YouTube: https://www.youtube.com/USMLERX Blog: https://usmle-rx.com/blog-posts/
Megaloblast. Now there’s a word you don’t hear every day. The root *-blast* comes from the Greek *blastos*, meaning “germ” or “bud,” and is familiar from terms like *blast cells*—very young…
