Apple Watch Ultra User Guide
- Welcome
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- Apple Watch Ultra gestures
- Set up and pair your Apple Watch Ultra with iPhone
- Choose a function for the Action button on Apple Watch Ultra
- The Apple Watch app
- Charge Apple Watch Ultra
- Turn on and wake Apple Watch Ultra
- Lock or unlock Apple Watch Ultra
- Change language and orientation on Apple Watch Ultra
- Remove, change, and fasten Apple Watch bands
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- Apps on Apple Watch Ultra
- Open apps
- Organize apps
- Get more apps
- Tell time
- Status icons
- Control Center
- Use Focus
- Adjust brightness, text size, sounds, and haptics
- See and respond to notifications
- Change notification settings
- Manage your Apple ID
- Use shortcuts
- Set up Handwashing
- Connect Apple Watch Ultra to a Wi-Fi network
- Connect to Bluetooth headphones or speakers
- Hand off tasks from Apple Watch Ultra
- Unlock your Mac with Apple Watch Ultra
- Unlock your iPhone with Apple Watch Ultra
- Use Apple Watch Ultra without its paired iPhone
- Use your Apple Watch Ultra with a cellular network
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- Alarms
- Blood Oxygen
- Calculator
- Calendar
- Camera Remote
- Compass
- Contacts
- Depth
- ECG
- Medications
- Memoji
- News
- Now Playing
- Reminders
- Stocks
- Stopwatch
- Timers
- Tips
- Voice Memos
- Walkie-Talkie
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- About Wallet
- Apple Pay
- Set up Apple Pay
- Make purchases
- Send, receive, and request money with Apple Watch Ultra (U.S. only)
- Manage Apple Cash (U.S. only)
- Use Wallet for passes
- Use rewards cards
- Pay with Apple Watch Ultra on Mac
- Ride transit
- Use your driver’s license or state ID
- Use digital keys
- Use COVID-19 vaccination cards
- Weather
- World Clock
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- VoiceOver
- Set up Apple Watch Ultra using VoiceOver
- Apple Watch Ultra basics with VoiceOver
- Apple Watch Mirroring
- Control nearby devices
- AssistiveTouch
- Use a braille display
- Use a Bluetooth keyboard
- Zoom
- Tell time with haptic feedback
- Adjust text size and other visual settings
- Adjust motor skills settings
- Set up and use RTT
- Accessibility audio settings
- Use accessibility features with Siri
- The Accessibility Shortcut
- Copyright
Record an electrocardiogram with the ECG app on Apple Watch Ultra
Apple Watch Ultra has an electrical heart rate sensor that, along with the ECG app 
, allows you to take an electrocardiogram (or ECG). To use the ECG app, update your iPhone 8 or later to the latest version of iOS and Apple Watch Ultra to the latest version of watchOS. The ECG app is not available in all regions.
Open the Health app on your iPhone, then follow the onscreen steps to set up ECG.
If you don’t see a prompt to set up, tap Browse at the bottom right, tap Heart, then tap Electrocardiogram (ECG).
Open the ECG app on your Apple Watch Ultra.
Rest your arm on a table or in your lap.
With the hand opposite your watch, hold your finger on the Digital Crown, then wait while Apple Watch Ultra records the ECG.
You don’t need to press the Digital Crown during the session.
At the end of the recording, you receive a classification. You can then tap Add Symptoms and choose your symptoms. Tap Save to note any symptoms, then tap Done. To view your results on iPhone, open the Health app on iPhone, tap Browse at the bottom right, then tap Heart > Electrocardiograms (ECG).
Important: To ensure the best reading after swimming, showering, heavy perspiration, or washing your hands, clean and dry your Apple Watch Ultra. It may take one hour or more for your Apple Watch Ultra to completely dry. ECG is designed to function between 32º and 95º F (0° and 35° C).
For more information about the ECG app, see the Apple Support article Taking an ECG with the ECG app on Apple Watch Series 4 or later, and the document ECG App Instructions for Use (IFU).