from a coding perspective you can reference the label's parent property to determine if it is linked to a control, or you can reference a controls control collection to determine if it has a label.
me.labelname.parent
me.controlname.controls(0).name
both will generate an error if there is not a control/label relationship (or one cannot exist - a label does not have a controls property for example) so if looping through the controls you will need error handling