How can i determine if i have svt? my heart goes up in the 200 when working out or from sitting to standing

Evaluation: Ecg while heart rate is fast would help. If you only have such rapid heart rates while working out, it is more likely that it is just your heart trying to keep up with demands if your body. Svt is usually sudden onset and suddenly terminated. Monitoring of heart rhythm could also help with diagnosis. Ultimately, electrophysiology study would be able to diagnose if all else fails.

Need a monitor: A cardiac monitor and treadmill stress test would be helpful in determining the cause of your symptoms. Having your heart rate increase to a maximim of 200 beats per minute during exercise is just within normal limits. Having that kind of increase from a position change alone would be very unusual. A 24 hour (holter) monitor would be helpful in determining if you have svt or not.