Browse categories and answer follow-up questions to refine your symptom profile.
Immediate priorities
Stabilization and time-critical decisions
Hemodynamic instability
SBP < 90 mmHg
Shock index > 1
Syncope
If instability, concurrent PE evaluation and resuscitation pathway
Limb threat
Phlegmasia cerulea dolens
Rapidly progressive swelling and severe pain
Cyanosis or mottling
If limb threat, immediate vascular surgery or IR consultation
Bleeding risk screen
Active bleeding
Recent major surgery or trauma
Recent intracranial hemorrhage
Platelets < 50 x 10^9/L
Anticoagulation timing
If high pretest probability and imaging delay, initiate anticoagulation unless contraindicated
If low or moderate pretest probability, diagnostic testing first
Key concepts
High-value framework
Proximal DVT emphasis
Popliteal or above as major PE risk
Distal calf DVT as lower PE risk with surveillance option
Provoked versus unprovoked classification
Major transient risk factor
Minor transient risk factor
Persistent risk factor
Unprovoked
Treatment duration logic
3 months minimum for most treated DVT
Extended therapy favored for unprovoked or persistent risk factors when bleeding risk acceptable
Monitoring and escalation
High-risk features and triggers
Concern for PE
Unexplained dyspnea
Pleuritic chest pain
Hemoptysis
Tachycardia
Hypoxemia
Anticoagulant complications
Rapid hemoglobin drop
New neurologic deficit
Severe headache
Persistent hypotension
Consultation triggers
Iliofemoral DVT with severe symptoms
Recurrent VTE on therapeutic anticoagulation
Antiphospholipid syndrome concern
Pregnancy-associated DVT
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.