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Criteria

• If all are present AND low suspicion for PE, no D-dimer needed:

1. Age <50yr
2. Pulse ox >94% (room air)
3. HR <100
4. No prior PE or DVT
5. No recent surgery or trauma (within prior 4wk)
6. No hemoptysis
7. No estrogen use
8. No unilateral leg swelling

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-Option 1 -Option 2 +Option 3 ||Answer text

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+Option 1 ||Answer text +Option 2 -Option 3 -Option 4 -Option 5

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| Option A | Option B | Option C ++- Question 1 (Clue: A and B are correct). -++ Question 2 ( Clue: B and C are correct). --+ Question 3 (Clue: C is correct).

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