Created at 11:01 p.m. Feb, 22, 2025
Author: cardamomo
Related Note: 1539943644042 1
Rationale for change

RDW is not a sensitive/specific enough measure to distinguish between IDA and thalassemia. This has shown up as a key piece of information in NBME forms in which a patient with thalassemia has an elevated RDW (specifically FM form 4, for which I have added a tag).

Some may use a cutoff of 21%, which has sufficient sensitivity/specificity.

There is a very similar card in the overhaul deck:

Anki id: 1516822273369

This information is corroborated by primary literature and also the Amboss article below:

https://next.amboss.com/us/article/tT0Xs2?q=thalassemia

Van Vranken M. Evaluation of microcytosis.. Am Fam Physician. 2010; 82(9): p.1117-22. pmid: 21121557.

https://pmc.ncbi.nlm.nih.gov/articles/PMC6151350/

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#AK_Step2_v12::#Resources_by_rotation::FM::nbme::form_4
#AK_Step2_v12::#AMBOSS::DK01iS #AK_Other::Card_Features::Shuffle #AK_Step1_v12::#B&B::12_Hematology::02_Red_Blood_Cells::04_Microcytic_Anemias #AK_Step2_v12::Original_decks::Dorian::fam::exam_guru #AK_Step2_v12::#AMBOSS::PuaWrm #AK_Step2_v12::#AMBOSS::e2axgP #AK_Step1_v12::#SketchyPath::09_Blood_&_Coagulation::01_Microcytic_Anemias::01_Microcytic_Anemia_Overview_&_Thalassemias #AK_Step1_v12::#AMBOSS::e2axgP #AK_Other::!AK_UpdateTags::AnKing_Image::AhmedK::Iron_Deficiency_Anemia #AK_Step2_v12::Original_decks::Dorian::peds::nbme #AK_Step1_v12::#AMBOSS::QJ0uFS #AK_Step2_v12::#CMS::Pediatrics::Form_04 #AK_Other::!AK_UpdateTags::AnKing_Image::!Subjects::Hematology::Iron_Deficiency_Anemia #AK_Step2_v12::#Resources_by_rotation::Peds::nbme #AK_Step2_v12::#UWorld::Step::2875 #AK_Step2_v12::#AMBOSS::VJ0GGS #AK_Other::#AK_Original_Decks::Step_2::Cheesy_Dorian_(M3) #AK_Step1_v12::#Bootcamp::Hematology_and_Oncology::03_Microcytic_Anemia::03_Iron_Deficiency_Anemia #AK_Step2_v12::#Subjects::Hematology::02_RBC::01_Microcytic_Anemia::Thalassemia::Pathophysiology #AK_Step2_v12::#Subjects::Hematology::02_RBC::01_Microcytic_Anemia::Iron_Deficiency::Pathophysiology #AK_Step2_v12::#AMBOSS::QJ0uFS #AK_Step2_v12::Original_decks::Dorian::obgyn::hyfacts #AK_Step2_v12::!Shelf::#Cards_AnKing_Did::2obgyn #AK_Step2_v12::#B&B::07_Hematology_and_Oncology::01_Red_Cells::02_Microcytic_Anemias #AK_Step2_v12::#Subjects::Hematology::02_RBC::01_Microcytic_Anemia::Iron_Deficiency #PANCE::EOR::IM #AK_Step2_v12::#Resources_by_rotation::IM::ome::heme/onc::microcytic_anemia #AK_Step2_v12::!FLAG_THESE_CARDS::Potential_duplicates #AK_Step2_v12::#Resources_by_rotation::Peds::uworld::heme/onc::heme/onc_dorian #AK_Step2_v12::#UWorld::COMLEX::101654 #AK_Step2_v12::#OME::01_Medicine::05_Hematology_Oncology::03_Microcytic_Anemia #AK_Step2_v12::#Subjects::Hematology::02_RBC::01_Microcytic_Anemia::Thalassemia #AK_Step2_v12::Original_decks::Dorian::im::ome::heme/onc::microcytic_anemia #AK_Step2_v12::#OME::Clinical::01_Medicine::05_Hematology_Oncology::03_Microcytic_Anemia #AK_Step2_v12::#Resources_by_rotation::ObGyn::hyfacts #AK_Step2_v12::#SketchyIM::08_Hematology_&_Oncology::02_Anemia::01_Anemia_Intro:_Microcytic_Anemia_DDx #AK_Step2_v12::Original_decks::Dorian::peds::emma #AK_Step2_v12::#UWorld::Step::4876 #AK_Step2_v12::#B&B::07_Hematology_and_Oncology::01_Red_Cells::03_Thalassemias #AK_Step1_v12::#B&B::12_Hematology::02_Red_Blood_Cells::05_Thalassemias::Extra #AK_Step2_v12::#Resources_by_rotation::FM::examguru #PANCE::HEME::cytopenias #AK_Step2_v12::#UWorld::Step::4875 #AK_Step2_v12::#UWorld::COMLEX::101653 #AK_Step1_v12::#Bootcamp::Hematology_and_Oncology::03_Microcytic_Anemia::09_β_Thalassemia #AK_Step2_v12::!Shelf::IM #PANCE::EOR::PEDS #AK_Step2_v12::#Resources_by_rotation::Peds::emma #AK_Step2_v12::#AMBOSS::jC0_7R #AK_Step2_v12::Original_decks::Dorian::peds::uw::heme/onc #AK_Step2_v12::#FirstAid::07_Hematology::04_Red_Blood_Cell_Disorders::01_Anemias::Extra #AK_Step1_v12::#Bootcamp::Hematology_and_Oncology::03_Microcytic_Anemia::08_⍺_Thalassemia