How common is asymptomatic dvt? is it more dangerous?

DVT: This is not the most common presentation. Usually symptoms are present. However, this form is very dangerous as the clot can pass to the lung and produce pulmonary embolism which can precipitate severe issues and possible death.

Not that common: A small percentage of DVT's are asymptomatic. Rough estimate is 5- 15% . The exact percentage is not known precisely. They are usually small or smaller sized. Asymptomatic DVT are found on more routine ultrasound exams and or after work up for Pulmonary Embolism[PE]. They are not more Dangerous than symptomatic DVTs, but all DVT have some danger.

Dvt: it is the presence of the dvt if acute , that is of concern, as potential for pulmonary embolism. a venous doppler sonogram is recommended and if acute dvt present then anticoagulation therapy needed

Asymptomatic DVT: It would be most unusual for DVT to be asymptomatic because without any symptoms how would one know to try to evaluate for DVT? Without swelling, pain, pressure, etc. there be no reason to routinely check for DVT. There are circumstances, however, where signs of old DVT are found on routine ultrasounds or cat scans and patients have no recollection of having had a DVT.