The rule
Single-review gaps stay unlabelled by rule, not by hesitation.
The waiting rule is categorical: a deviation receives its classification only after it survives the next evidence window. This is not a judgement call made case by case, and that is deliberate, because a discretionary version would be applied unevenly in exactly the predictable direction — favourable gaps labelled quickly, adverse ones left pending, and the record accumulating a bias nobody chose. A fixed rule produces a uniform delay across every kind of gap. The cost is that a genuine signal is recognised one period later than it could have been. The benefit is that the far more numerous false signals are never recognised at all.
Schematic: review periods of corroborating evidence required before each classification may be recorded. The burden rises with the drama of the diagnosis and with what the label authorises.

