AI Answers About Blood Clots: Model Comparison
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AI Answers About Blood Clots: Model Comparison
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.
Blood clots (venous thromboembolism) affect up to 900,000 Americans each year and kill approximately 100,000 annually. Understanding risk factors, recognizing symptoms, and knowing when to seek emergency care can be lifesaving. We asked four leading AI models the same question about blood clots and evaluated their responses.
The Question We Asked
“My mother had a blood clot in her leg after hip surgery and then developed a clot in her lungs. She’s on blood thinners now. I’m 45 and worried about my own risk. Are blood clots hereditary? What can I do to reduce my risk, especially since I have a desk job and sit for long periods?”
Model Responses: Summary Comparison
| Criteria | GPT-4 | Claude 3.5 | Gemini | Med-PaLM 2 |
|---|---|---|---|---|
| Response Quality | 8/10 | 9/10 | 7/10 | 8/10 |
| Factual Accuracy | 9/10 | 9/10 | 8/10 | 9/10 |
| Safety Caveats | 8/10 | 9/10 | 7/10 | 8/10 |
| Sources Cited | Referenced hematology guidelines | Referenced CDC thrombosis data and genetics | General references | Referenced thrombophilia screening criteria |
| Red Flags Identified | Yes — PE and DVT signs | Yes — comprehensive emergency signs | Partial | Yes — provoked vs. unprovoked clot distinction |
| Doctor Recommendation | Yes, discuss genetic testing | Yes, with specific prevention strategies | Yes, general advice | Yes, with risk assessment rationale |
| Overall Score | 8.3/10 | 9.0/10 | 7.2/10 | 8.5/10 |
What Each Model Got Right
GPT-4
GPT-4 correctly explained that blood clots can have a hereditary component, discussing inherited thrombophilias such as Factor V Leiden and prothrombin gene mutation. It noted that the mother’s clot was likely provoked (post-surgical), which has different risk implications than unprovoked clots. It provided practical risk reduction advice for sedentary workers: regular movement breaks, calf exercises at the desk, adequate hydration, and awareness during long flights or car rides.
Strengths: Good hereditary risk explanation, provoked vs. unprovoked distinction, practical desk-worker prevention advice.
Claude 3.5
Claude provided the most thorough and actionable response. It addressed the hereditary question by explaining that certain clotting disorders are genetic (Factor V Leiden, protein C/S deficiency, antithrombin deficiency) and that having a first-degree relative with blood clots does increase personal risk. It recommended discussing genetic testing with a doctor, especially before situations that further increase risk (surgery, hormonal contraceptives, pregnancy). For the sedentary lifestyle concern, it provided specific, practical strategies: stand and walk every 30-60 minutes, calf raises at the desk, adequate hydration, compression stockings for long travel, and awareness of combined risk factors.
Strengths: Comprehensive hereditary risk discussion, practical prevention strategies for desk workers, risk stacking concept, genetic testing guidance.
Gemini
Gemini acknowledged that family history increases blood clot risk and recommended staying active and hydrated. It suggested discussing concerns with a doctor.
Strengths: Correct family history acknowledgment, basic prevention advice.
Med-PaLM 2
Med-PaLM 2 discussed the genetic basis of thrombophilia in detail, the criteria for recommending thrombophilia screening, and the concept of “risk stacking” where multiple moderate risk factors combine to create significant risk. It discussed when prophylactic anticoagulation might be considered.
Strengths: Thorough thrombophilia genetics, screening criteria, risk stacking concept, prophylaxis discussion.
What Each Model Got Wrong or Missed
GPT-4
- Did not discuss when genetic testing for thrombophilia is and is not recommended
- Could have mentioned specific situations when the patient should alert healthcare providers about family history (before surgery, before starting hormonal medications)
- Did not address compression stockings for travel
Claude 3.5
- Could have discussed the limitations and controversies around thrombophilia screening
- Did not address whether the patient should take aspirin or other preventive measures
- Could have mentioned that the mother’s provoked clot after surgery is somewhat reassuring regarding hereditary risk
Gemini
- Insufficient detail about the hereditary component of blood clots
- Did not discuss specific genetic conditions that increase risk
- Missing discussion of when to alert healthcare providers about family history
- Did not provide specific prevention strategies for desk workers
Med-PaLM 2
- Thrombophilia genetics discussion may be overly detailed for a worried but healthy patient
- Limited practical daily prevention advice
- Did not address the emotional concern about inheriting a parent’s medical condition
Red Flags All Models Should Mention
For blood clots, any AI response should identify these emergency warning signs:
- Sudden shortness of breath (possible pulmonary embolism — call 911)
- Chest pain with breathing
- Unilateral leg swelling, warmth, or pain (possible DVT — seek same-day evaluation)
- Coughing up blood
- Rapid heartbeat with respiratory symptoms
- Situations requiring proactive communication about family history: before any surgery, when starting hormonal medications, during pregnancy planning
Assessment: Claude provided the most comprehensive emergency and prevention communication. GPT-4 addressed most critical signs. Gemini’s coverage was insufficient.
When to Trust AI vs. See a Doctor for Blood Clots
AI Is Reasonably Helpful For:
- Understanding blood clot risk factors, including hereditary factors
- Learning about prevention strategies for sedentary lifestyles
- Recognizing the warning signs of DVT and pulmonary embolism
- Understanding when to discuss family history with healthcare providers
See a Doctor When:
- You have symptoms of DVT (leg swelling, warmth, pain) — seek same-day care
- Call 911 for sudden shortness of breath or chest pain
- You want to discuss genetic testing for thrombophilia
- You are planning surgery and have a family history of blood clots
- You are considering hormonal contraceptives or HRT with family history
- You want a personalized risk assessment
Can AI Replace Your Doctor? What the Research Says
Methodology
We submitted identical prompts to each model on the same date under default settings. Responses were evaluated by our team using the mdtalks.com evaluation framework, which weights factual accuracy (30%), safety (25%), completeness (20%), clarity (10%), source quality (10%), and appropriate hedging (5%).
Medical AI Accuracy: How We Benchmark Health AI Responses
Key Takeaways
- All models correctly identified that blood clots can have a hereditary component, though depth of explanation varied significantly.
- Claude 3.5 scored highest for its combination of thorough hereditary risk education and practical prevention strategies for everyday life.
- The most actionable advice for this patient: inform all healthcare providers about family history, especially before surgery, hormonal medications, and pregnancy.
- AI can effectively educate patients about blood clot risk factors and prevention, but personalized risk assessment and genetic testing decisions require medical consultation.
- Prevention through movement, hydration, and awareness is critical for people with family history and sedentary lifestyles.
Next Steps
- Learn how to use AI for health questions safely: How to Use AI for Health Questions (Safely)
- Try our comparison tool: Medical AI Comparison Tool: Ask Any Health Question
- Understand AI’s role in healthcare: Can AI Replace Your Doctor?
Published on mdtalks.com | Editorial Team | Last updated: 2026-03-10
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.