Haematology: Low MCV: cause confirmed?

A fictional low-MCV example teaches the difference between observation and explanation. MCV measures average red-cell volume. Iron deficiency and thalassaemia are two possible causes of a low-MCV pattern; the measurement alone does not identify the cause. No patient values, diagnostic thresholds or treatments are given. Original 36-second silent lesson with a pause and answer. Silent caption-led lesson; no narration or music. Original AI-assisted diagrams; AI source review 16 October 2026, not clinician certification. Sources: https://medlineplus.gov/lab-tests/mcv-mean-corpuscular-volume/ https://medlineplus.gov/lab-tests/reticulocyte-count/ https://www.nhlbi.nih.gov/health/anemia/diagnosis Create a review prompt: https://meyshan.com/app/recall?utm_source=meyshantube&utm_medium=video&utm_campaign=student_daily_202610&utm_content=d10_c Transcript: on-screen text from this silent video; no spoken narration.