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Causes of Abnormal PT and/or aPTT
Prolonged Prothrombin Time (PT)
1. Acquired deficiency of FVII
Abnormal PT and/or aPTT ... typically prolong aPTT ... may prolong the aPTT ... Prolonged PT and aPTT ... intravascular coagulation (DIC
Differential Diagnosis for a Prolonged PT and aPTT
If the PT and the aPTT are both prolonged,
Prolonged PT and aPTT ... the PT and the aPTT ... intravascularcoagulation (DIC ... #Abnormal #PT #aPTT
Disseminated Intravascular Coagulation (DIC) Overview

Increased Clotting and Consumption of Clotting Factors

Findings:
 • Bleeding
 • Recent history
Intravascular Coagulation (DIC ... • Prolonged PT/PTT ... Manifestations of DIC ... PT/INR: ↑ • PTT ... INR < 2.3 - APTT
ISTH Scoring System for Disseminated Intravascular Coagulation (DIC)
Platelet count:
 • Expected: Low (or normal)
 • Elevation
Intravascular Coagulation (DIC ... aggregation PT, aPTT ... small vessels #DIC
How to Evaluate an Abnormal APTT
Step 1: Is the PT or APTT Artifactually Prolonged?
Step 2: Is
Evaluate an Abnormal APTT ... : Is the PT or APTT ... Prolonging the PT or APTT ... cause of Prolonged APTT ... ISNeducation #Abnormal #APTT
Prothrombin Time (PT) and Partial Thromboplastin Time (PTT)

Prothrombin Time (PT) - Often Elevated in:
 • Vitamin
Thromboplastin Time (PTT ... Thromboplastin Time (PTT ... elevated in: • DIC ... thematttsai #PT #PTT
Approach to Elevated aPTT / PT - Differential Diagnosis Algorithm

aPTT: Intrinsic / Final
PT: Extrinsic / Final

By
Approach to Elevated aPTT ... Diagnosis Algorithm aPTT ... #Elevated #aPTT
Algorithm for Investigation of Abnormal Coagulation Tests
- Prolonged PT
- Prolonged aPTT and Prolonged PT
- Prolonged aPTT

Dr.
PT - Prolonged aPTT ... PT - Prolonged aPTT ... Coagulation #Abnormal #APTT
Therefore, studies obtained at the initial presentation in the emergency department should evaluate for fibrinolysis with
thromboplastin time (PTT ... decompensated DIC ... Diagnosis #Honc #DIC
Thrombotic Thrombocytopenic Purpura (TTP) vs Disseminated Intravascular Coagulation (DIC)
#Diagnosis #TTP #DIC #Comparison #Table #Laboratory #Findings #RebelEM
Intravascular Coagulation (DIC ... Diagnosis #TTP #DIC