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Causes of Abnormal PT and/or aPTT
Prolonged Prothrombin Time (PT)
1. Acquired deficiency of FVII
Causes of Abnormal PT ... Prothrombin Time (PT ... typically prolong PT ... Disseminated intravascular ... #Abnormal #PT
ISTH Scoring System for Disseminated Intravascular Coagulation (DIC)
Platelet count:
 • Expected: Low (or normal)
 • Elevation
for Disseminated Intravascular ... platelet aggregation PT ... , aPTT: • Expected ... using INR use PT ... #Disseminated #Intravascular
Disseminated Intravascular Coagulation (DIC) Overview

Increased Clotting and Consumption of Clotting Factors

Findings:
 • Bleeding
 • Recent history
Disseminated Intravascular ... • Prolonged PT ... Fibrinogen: ↓ • PT ... INR < 2.3 - APTT ... #Disseminated #Intravascular
How to Evaluate an Abnormal APTT
Step 1: Is the PT or APTT Artifactually Prolonged?
Step 2: Is
Evaluate an Abnormal APTT ... Step 1: Is the PT ... or APTT Artifactually ... Prolonging the PT ... or APTT?
Approach to Elevated aPTT / PT - Differential Diagnosis Algorithm

aPTT: Intrinsic / Final
PT: Extrinsic / Final

By
Approach to Elevated aPTT ... / PT - Differential ... Intrinsic / Final PT ... #Elevated #aPTT ... #PT #INR #Algorithm
Algorithm for Investigation of Abnormal Coagulation Tests
- Prolonged PT
- Prolonged aPTT and Prolonged PT
- Prolonged aPTT

Dr.
Tests - Prolonged PT ... - Prolonged aPTT ... and Prolonged PT ... - Prolonged aPTT ... Coagulation #Abnormal #APTT
Causes of Prolonged PT (INR), Prolonged PTT
 • Prolonged PT (INR), Prolonged PTT
 • Prolonged PT
Causes of Prolonged PT ... • Prolonged PT ... • Prolonged PT ... , Normal PT (INR ... , Normal PT (INR
Causes of Extravascular and Intravascular Hemolysis - Differential Diagnosis Algorithm
Extravascular - Spleen and RES-mediated hemolysis
 -
Causes of Extravascular ... and Intravascular ... PK deficiency Intravascular ... #Hemolysis #Intravascular ... #Extravascular
Evaluation of Patients with Anemia

Microcytic, Normocytic, Macrocytic, Hemolytic (Intravascular and Extravascular)

#Diagnosis #Anemia #Workup #Macrocytic #Microcytic #Normocytic
Macrocytic, Hemolytic (Intravascular ... and Extravascular
Diagnostic Framework for Hemolysis - Intravascular vs Extravascular Causes
Intravascular Hemolysis:
 • Mechanical Trauma (Microangiopathic hemolytic anemia):
for Hemolysis - Intravascular ... vs Extravascular ... Causes Intravascular ... - Disseminated intravascular ... Hemolysis #Hemolytic #Intravascular