Algorithms in Medicine @MatthewHoMD
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Matthew Ho, MD PhD https://twitter.com/MatthewHoMD
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Hemolytic Anemias - Differential Diagnosis Algorithm

Signs of anemia and hemolysis:
 • ↓ Haptoglobin
 • ↑ LDH
Hemolytic Anemias ... - Differential ... of anemia and hemolysis ... Immune-mediated Hemolysis ... #Anemias #Differential
Autoimmune Hemolytic Anemia (AIHA) - Differential Diagnosis Table

Warm AIHA (48-70%)
Cold AHA (16-32%)
 • Donath-Landsteiner HA (paroxysmal
Autoimmune Hemolytic ... Anemia (AIHA) - Differential ... #Autoimmune #Hemolytic ... #Anemia #AIHA #Differential
Pulmonary Function Testing (PFT) Interpretation Algorithm

Restrictive Lung Disease:
 • Chest wall or neuromuscular disorders
 • Interstitial
Pulmonary Function ... Lung Disease Obstructive ... #Pulmonary #Function
Algorithmic Approach to Anemia - Differential Diagnosis Framework by MCV

Microcytic (MCV < 80) "TAILS":
 • Thalassemia
Approach to Anemia - Differential ... -100): • Non-hemolytic ... anemia, CKD • Hemolytic ... MCV #Algorithm #Differential
Pancytopenia - Differential Diagnosis Algorithm
 • 12-13 g/dL,
 • ANC < 1800/uL,
 • platelet < 150,000/uL

Initial
Pancytopenia - Differential ... studies, PT/aPTT Differential ... ↑ Destruction (hemolysis ... #Pancytopenia #Differential
Approach to Thrombotic Microangiopathy (TMA) - Differential Diagnosis and Management Algorithm

Suspected TMA: Unexplained thrombocytopenia + MAHA
Microangiopathy (TMA) - Differential ... hemosiderin, Hepatic function ... Microangiopathy #TMA #Differential
Ascites Differential Diagnosis Table - Serum Ascites Albumin Gradient (SAAG)

SAAG ≥ 1.1:
 • Cirrhosis
 • Portal
Ascites Differential ... tamponade • IVC obstruction ... MatthewHoMD #Ascites #Differential
Hypokalemia - Differential Diagnosis Algorithm

Transcellular Shift:
 • Alkalosis
 • ↑ beta-2 adrenergic simulation 
 • Erythropoiesis
Hypokalemia - Differential ... GI losses (NG suction ... #Hypokalemia #Differential
Iron Deficiency Anemia - Differential Diagnosis Algorithm

Labs: Ferritin, iron, transferrin, TIBC, TSAT, sTfR

 • Blood loss:
Deficiency Anemia - Differential ... extravascular) hemolysis ... Deficiency #Anemia #Differential
Approach to Thrombocytosis - Elevated Platelet Count - Differential Diagnosis Algorithm

Peripheral Smear concerning for malignancy?
Platelet Count - Differential ... blood loss, Acute hemolysis ... Thrombocytosis #Platelets #Differential