How can my bp at dr be 135/82 and at home be as low as 115/63? is white coat hypertension a reality?

Yes: White coat HTN has been confirmed as a reality, and very common finding on patients. You can qualify for 24 ambulatory home BP monitoring if you want to truly find out your average daily bp.

Yes: White coat anxiety is a real entity. Additional stress and anxiety, and even the mere act of driving to the dr. May increase ones bp. That's why its good to take several measurements at the doctors over time. Another cause of discrepancies is the manner of checking the bp. It is likely that different devices are used. Some are the automated ones, some are the ones where the dr. Uses a stethoscope.