Insights — Surgical Operations
Why Your OR Utilization Number Is Probably Wrong
Most reported utilization figures measure the wrong denominator entirely. Here's the definition that actually predicts where OR capacity is being lost.
Insights — Surgical Operations
Most reported utilization figures measure the wrong denominator entirely. Here's the definition that actually predicts where OR capacity is being lost.
Most hospitals and ASCs calculate OR utilization off scheduled block hours against total hours in the day, every room, around the clock. That produces a number that looks reasonable on a dashboard and explains almost nothing about where capacity is actually being lost.
Utilization only means something when it is measured against the hours a room is actually staffed and available for elective cases, not midnight to midnight. A room open eight hours a day that is running cases for five and a half of those hours is running at roughly 66%. The same room measured against a 24-hour day looks dramatically worse, and against a padded "available hours" figure looks artificially better. Neither framing tells you what to fix.
A block that shows high utilization can still be bleeding capacity if turnover between cases runs long. Utilization measured at the block level hides what is happening at the case level. The fix is not a bigger utilization number, it is a shorter, more consistent turnover time and a schedule built around real average case length instead of a surgeon's original estimate from years ago.
When we take on an OR utilization engagement, we look at three numbers together, not one: prime-time utilization, first-case on-time starts, and turnover time by block. In one health system, moving all three in tandem unlocked more than 9,000 additional surgical cases within six months, not because utilization went up in isolation, but because the block schedule finally reflected how the OR actually ran.
If your utilization number is trending flat quarter over quarter, the number itself probably is not lying. It is measuring the wrong thing. Before adding OR time or renegotiating block allocations, get clear on prime-time definition, turnover time, and first-case starts as one picture. That is usually where the real capacity is hiding. See how we approach OR utilization and FCOT work on the Surgical Operations page →
Whether the problem is capacity, economics, staffing or execution, we'll help you identify what's holding performance back, and what to do about it.
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