DNA stands for "did not attend". A clinic's DNA rate is the share of booked appointments where the patient neither arrived nor cancelled in time for the slot to be reused. It is the same measurement most of the world calls a no-show rate; the abbreviation is standard in the UK and among clinicians trained in the NHS.
The two names describe one number, and the only reason to know both is that a clinic with staff trained in different places will use both in the same meeting.
How it is calculated
DNA rate = did-not-attend appointments ÷ booked appointmentsOver a full month rather than a bad week. The denominator is appointments that were booked, not slots that existed — a half-empty diary is a capacity problem, and mixing it in here hides both.
What must be counted separately
Cancellations. A patient who cancels two days out has given you a slot you can sell; a DNA has not. They look identical on the calendar afterwards and they are opposite problems.
When a clinic makes cancelling easier, the DNA rate falls and the cancellation rate rises. That looks like a mixed result on a dashboard and is usually an unambiguous win — the question is what share of the freed slots you managed to refill.
Late cancellations
Most clinics set a cutoff — often 24 or 48 hours — and count anything later as a DNA rather than a cancellation, on the grounds that a slot released an hour before is not a slot you can sell. That is defensible, and the important part is to write the cutoff down and keep it, because moving it quietly is how a clinic convinces itself the number improved.
What a good rate looks like
There is no benchmark worth quoting. It swings with speciality, appointment length, how far ahead you book and who your patients are, so a borrowed average will mislead you in whichever direction it happens to sit. Your own figure last quarter is the only comparison that means anything — and there is a calculator for what it costs you.
Common questions
- Is a DNA the same as a no-show?
- Yes. "Did not attend" is the phrase used in the UK and by NHS-trained clinicians; "no-show" is more common elsewhere. Same measurement, same arithmetic.
- Should a late cancellation count as a DNA?
- If it came too late to give the slot to somebody else, counting it as a DNA reflects what actually happened. Set a cutoff, write it down, and do not move it — a definition that drifts makes the trend meaningless.
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