How do you measure an EMS system?

Cardiac arrest survival rates?  Profit? Market share?


How can one system accurately compare themselves to another?

I was tasked earlier in the year with a seemingly simple question: “Are we busy? How busy?”


Um, yes and um, a lot?


Many systems use a measurement of Unit Hour Utilization (UHU), or a numerical value of how much time you spend doing EMS stuff.  This number can then be compared to others since it uses two basic measurements.  Those measurements are Hours Staffed and Time on Task.

Let’s say you’re on Medic 99 for 12 hours. 12 is your denominator, since you spent 12 hours on the rig.  Your time on task is defined slightly differently from place to place, but the standard definition is any time you spend responding to, at the scene of, transporting from or at hospital following a call for service.  This total becomes your numerator.  So let’s just say that on your 12 hour shift you ran 5 calls for a total time of 7.25 hours.  That means 7.25(time on task)/12(hours staffed) is a UHU of .60.  Quite busy indeed.

But I learned very quickly this is not a complete picture of the shift.

You see, you didn’t magically appear in service when you came on duty, you had to get the rig checked and fueled.  Then at the end of your shift you had to return to base and try to get the rig squared away for the next shift.

We refer to this time as the “Logistics Gap” or the amount of time we are paying you to do what should have been done already.  On average this can take 30 minutes at the start and end of a shift.  Now your 12 hour shift feels like an 11 hour shift.  That increases your UHU from 7.25 hours in a 12 hour shift to 7.25 hours in an 11 hour shift, or a .68.

That’s even busier.

But STILL not accurate.

What about all that post moving?

We spent months trying to get our servers to spit out CAD data that tracked post moving, but the language just didn’t understand what we were trying to do.  Adding up all the post moving time gives us an idea of how much time we are paying you to drive around instead of sitting still eating, going to the bathroom, studying, etc.


Applying that total, let’s say it’s a whole 60 minutes per shift, brings our UHU to 8.25 (7.25 time on task plus 1 hour post moving)/11 hours (12 hour shift – logistics gap) or .75.


From a .6 to a .75 is a HUGE difference!  If you are only tracking your UHU Actual, or the Time on Task/Hours paid, you are not getting an accurate picture of how busy your crews really are.


The best part of tracking these 3 values is that you can track them separately and add them up in a simple table.  Now when you introduce a new inventory tracking system that reduces restocking time, the impact can be measured and compared to previous days.  Or if a new software program at dispatch makes post moving less efficient, we can track it and break it down.


If your reports can be configured properly you can then measure each rig, each hour, each area of your district to see who is busy and how busy they are compared to others.


My agency is in the middle of gearing up for an expansion of market share and trying to figure out how busy we will be at different staffing levels is a breeze.  Just add a few rigs to the mix and rerun the math.

Yup, that’s what I do now.

So, how busy are we? That’s a secret. ;P

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