How many Basic Life Support services do not have intercept support from Advanced Life Support agencies in the US?

In the U.S., a significant number of Basic Life Support (BLS) services operate without intercept support from Advanced Life Support (ALS) agencies. Estimates vary, but many rural and underserved areas may have BLS services that lack immediate access to ALS units. This can impact patient outcomes, as timely advanced care is crucial in emergencies. Overall, the exact number can differ widely based on geographic and demographic factors.