This study investigates the best treatment duration for children with blood clots in the veins. Blood clots can block veins, which are blood vessels that carry blood back to the heart. The study aims to find out how long children should be treated to balance the risk of bleeding against the risk of the clot forming again.
Participants will have follow-up scans of their clots, which are part of their regular care, to help decide the treatment length. The study will also look at how different blood thinning medicines might affect long-term outcomes. The type of blood thinner each child receives will be chosen by their doctor.
- Who can participate: Children from birth to under 21 years old with a blood clot in a vein confirmed by a scan can participate. The clot must have occurred in the past 30 days and be caused by a specific event, like surgery or infection.
- Study details: Participants will have follow-up scans of their clots to help determine how long they need to take blood thinners. The type of blood thinner will be decided by their doctor, not the study.

