You should have an ultrasound imaging exam of the leg which is to get treated. This exam is essential for evaluating the diseased superficial vein and planning the procedure. As opposed to Laser and Radiofrequency which has been in use for > a decade, Venaseal is a reasonably new procedure; https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-a-comprehensive-guide/