When Apple introduced blood oxygen monitoring for the series 6 Apple Watch they were careful not to market it as a health feature as to avoid regulatory approval and they are now able to offer it into more countries than the ECG app. Here’s a list of countries that can get the blood oxygen monitoring:

Anguilla
Antigua and Barbuda Argentina
Aruba
Australia
Austria
Bahamas
Bahrain
Barbados
Belgium
Bermuda
Bolivia
Brazil
British Virgin Islands Bulgaria
Canada
Cayman Islands Chile
China mainland Colombia
Costa Rica
Croatia
Cyprus
Czech Republic Denmark
Dominica
Dominican Republic Ecuador
El Salvador Estonia Finland France Germany Gibraltar Greece Grenada Guadeloupe Guam Guatemala Guernsey Guinea Guyana Honduras Hong Kong Hungary Iceland India Indonesia Ireland
Isle of Man Israel
Italy Jamaica Japan Jersey
Kazakhstan Kuwait
Latvia
Lithuania Luxembourg Macao
Malaysia Martinique Mayotte
Mexico
Monaco Montserrat Morocco Netherlands
New Zealand Nicaragua Norway
Oman
Panama Paraguay
Peru
Philippines Poland
Portugal
Puerto Rico Qatar
Republic of Korea
Reunion Island Romania Russia
Saudi Arabia Singapore Slovakia Slovenia South Africa Spain
St. Barts
St. Kitts and Nevis St. Lucia
St. Maarten
St. Vincent
Sweden
Switzerland
Taiwan
Thailand
Trinidad and Tobago Turkey
Turks and Caicos United Kingdom Ukraine
United Arab Emirates Uruguay
United States
US Virgin Islands