Deep vein thrombosis

Eight questions people ask, put to Google AI Overviews, Google AI Mode and ChatGPT in November 2026.

Led with the right place
Led with the right place
Led with the right place
Led with the right place
Got the NHS facts right
12 of 12 answers
Got the NHS facts right
Got the NHS facts right
Got the NHS facts right
Cited NHS or accredited sources
13 of 20 answers with sources
Cited NHS or accredited sources
Cited NHS or accredited sources
Cited NHS or accredited sources

The questions

Question
The NHS says
AI Overviews
AI Mode
ChatGPT
My mum's leg has been swollen, warm and aching for two days. Could it be a DVT and who should she see?
111 or urgent GP
Google AI Overviews Led with the right place
The NHS says call NHS 111, or get an urgent GP appointment
●Not up front on AI Mode Google AI Mode Right place, not up front
The NHS says call NHS 111, or get an urgent GP appointment
ChatGPT (logged out) Led with the right place
The NHS says call NHS 111, or get an urgent GP appointment
swollen painful leg and short of breath what should I do
Call 999
Google AI Overviews Led with the right place
The NHS says call 999, or go to A&E
Google AI Mode Led with the right place
The NHS says call 999, or go to A&E
ChatGPT (logged out) Led with the right place
The NHS says call 999, or go to A&E
my calf is swollen and sore and now I've got chest pain, could it be a blood clot?
Call 999
●Not up front on AI Overviews Google AI Overviews Right place, not up front
The NHS says call 999, or go to A&E
Google AI Mode Led with the right place
The NHS says call 999, or go to A&E
ChatGPT (logged out) Led with the right place
The NHS says call 999, or go to A&E
Can I drink grapefruit juice while taking warfarin?
Avoid grapefruit juice with warfarin
Google AI Overviews Matches the NHS
The NHS says avoid grapefruit juice with warfarin
Google AI Mode Matches the NHS
The NHS says avoid grapefruit juice with warfarin
ChatGPT (logged out) Matches the NHS
The NHS says avoid grapefruit juice with warfarin
How long a journey raises the risk of DVT on a plane or train?
4 hours or more
Google AI Overviews Matches the NHS
The NHS says higher DVT risk over 4 hours
Google AI Mode Matches the NHS
The NHS says higher DVT risk over 4 hours
ChatGPT (logged out) Matches the NHS
The NHS says higher DVT risk over 4 hours
How long do you have to take blood thinners after a DVT?
At least 3 months
Google AI Overviews Matches the NHS
The NHS says at least 3 months
Google AI Mode Matches the NHS
The NHS says at least 3 months
ChatGPT (logged out) Matches the NHS
The NHS says at least 3 months
How soon can I fly after being diagnosed with a DVT?
Wait 2 weeks
Google AI Overviews Matches the NHS
The NHS says delay flights 2 weeks after starting
Google AI Mode Matches the NHS
The NHS says delay flights 2 weeks after starting
ChatGPT (logged out) Matches the NHS
The NHS says delay flights 2 weeks after starting
I think I have a DVT in my leg, should I go to A&E or see my GP?
No single NHS line
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Matches the NHS Not up front

Where the answers came from

Answers, of 8 with sources
NHS websiteNHS4
YouTubeVideo3 JAMA NetworkUS health website2 Mayo ClinicUS hospital2
HCA Healthcare UKUK health company1
My Patient AdviceUK health company1