10 results
Approach to Thrombotic Microangiopathy (TMA) - Differential Diagnosis and Management Algorithm

Suspected TMA: Unexplained thrombocytopenia + MAHA
/aPTT MAHA likely ... schistocytes > 1% ... hemosiderin • PT ... /aPTT normal • ... Management #Algorithm #hematology
Causes of Abnormal PT and/or aPTT
Prolonged Prothrombin Time (PT)
1. Acquired deficiency of FVII
) 1. ... FVIII antibody ... aPTT 1. ... Causes #diagnosis #differential ... #hematology #coagulation
Mixing Study
 • Clotting tests can be abnormal due to either a clotting factor deficiency, or
activity (e.g. antibody ... to be normal. 1: ... PT and/or aPTT) ... Study #diagnosis #hematology ... pathophysiology #hematology
Antinuclear Antibody Testing - Nuclear and Cytoplasmic Patterns
Nuclear Patterns:
 • Homogeneous pattern: 
   -
Antinuclear Antibody ... SLE, SjS, CTD-ILD ... phenomenon - EJ, Jo-1, ... #differential # ... diagnosis #rheumatology
Differential Diagnosis for a Prolonged PT and aPTT
If the PT and the aPTT are both prolonged,
Differential Diagnosis ... PT and the aPTT ... Causes include : 1. ... Causes #diagnosis #differential ... #hematology #coagulation
Platelet disorders and Aggregometry
Glanzmann Thrombasthenia
 • Defective aggregation to all agonists except ristocetin
 • Normal platelet,
Normal platelet, PT ... , PTT (diff from ... cytometry — GP Ilb ... either severe Type 1 ... Platelet #disorders #hematology
Bleeding and Bruising - Disorders of Hemostasis - Differential Diagnosis Framework

== Quantitative or Qualitative defect in
of Hemostasis - Differential ... == NORMAL PT ... Acquired: • Mild ... Bruising #Hemostasis #Differential ... #Diagnosis #Hematology
Antinuclear Antibody Testing Cytoplasmic Patterns
Reticular/AMA: 
 • PBC, SSc, PBC/SSc OS, PBC/SjS OS
 • AMA
Speckled:
 •
Antinuclear Antibody ... SLE, SjS, CTD-ILD ... phenomenon • EJ, Jo-1, ... #differential # ... diagnosis #rheumatology
TTP - Laboratory Evaluation for Thrombotic Thrombocytopenic Purpura

Activity of von Willebrand factor-cleaving protease activity - A
be performed PT ... , PTT, and fibrinogen ... WBC count and differential ... - Shows a mild ... Diagnosis #Workup #Hematology
Macrophage Activation Syndrome (MAS)
Classified among the secondary or acquired forms of haemophagocytic lymphohistiocytosis (sHLH)

What?
A subset of
-1 and IL-6, leading ... Hypofibrinogenemia • ↑ PT ... ↑ PTT • ↑ Fibrin ... Diagnosis #Management #Hematology ... #Rheumatology