The charting software my company uses just has a scale of mild to severe for these symptoms which I find utterly useless due to its subjectivity. When charting SOB, I'll chart how many words the patient can speak in one breath as a way to illustrate the severity of the symptom. 3-word dyspnea being worse than 5 word, etc. If patient is non-verbal, you're dependent upon respiratory rate and "character" description of the patient's respirations. We are limited by our EMR systems, but we always have space to draw the picture in our narratives.