15 results
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 ... #Abnormal #PT #aPTT
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 ... , FVII, FIX, FX ... , FVII, FIX, FX) ... #Abnormal #PT #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 ... Hematology #Diagnosis #Workup
Chest Pain - Diagnosis and Workup Algorithm

History and Exam
Acute life-threatening causes:
 • Acute myocardial infarction
 •
Diagnosis and Workup ... rupture Initial workup ... LET, lipase, PT. aPTT ... Diagnosis #Algorithm #workup
Pancytopenia - Differential Diagnosis Algorithm
 • 12-13 g/dL,
 • ANC < 1800/uL,
 • platelet < 150,000/uL

Initial
/uL Initial Workup ... iron studies, PT/aPTT ... Algorithm #hematology #workup
Prothrombin Time (PT) and Partial Thromboplastin Time (PTT)

Prothrombin Time (PT) - Often Elevated in:
 • Vitamin
Thromboplastin Time (PTT ... warfarin) • Factor VII ... Thromboplastin Time (PTT ... thematttsai #PT #PTT
Standardized Physical Abuse Guideline
<6 months of age
 • Social work consult
 • Skeletal survey
 • Head
age • Social work ... appearance • CBC, PT, PTT ... Abuse #Guidelines #Workup
Approach to the Hypercoagulable State
Arterial thromboembolism
→ Cardiac rhythm monitoring, Echocardiogram, Vascular imaging
→ Test for APS, particularly
- No other workup ... screening, CBC, aPTT ... Hypercoagulable #Workup
Disseminated Intravascular Coagulation (DIC) Overview

Increased Clotting and Consumption of Clotting Factors

Findings:
 • Bleeding
 • Recent history
• Prolonged PT/PTT ... levels of factors VII ... PT/INR: ↑ • PTT ... INR < 2.3 - APTT
Algorithm for managing FVII deficiency.

*Mild bleeding history includes minor epistaxis, menorrhagia, gastrointestinal bleeding, joint and soft
Algorithm for managing FVII ... #FVII #deficiency ... #FactorVII #Factor7