significant errors? probably not but the standard of care for taking a blood pressure indicates that the stethoscope have skin-to-skin contact. it is possible to hear an accurate blood pressure through a thin shirt but never a sweater or sweat shirt. i have this same issue with listening to the heart or lungs through the shirt. there is really no excuse for not using proper examination technique to hear more accurate ausculation sounds.
does taking blood pressure readings with cuff over a shirt create significant errors?