Once a year except in adults except for women in childbearing age every six months. In patients with liver /kidney disease, more frequently. In children, it's different the younger the kid the higher the frequency.

Once a year, but if there's a significant change in other meds or condition, I will check sooner. We try to ask our pregnant patients to check levels monthly during the second & third trimesters so we can try to keep levels stable, but compliance is often variable. If someone is planning a pregn...

In patients with huge weight changes, I do it more frequently. In aged people, the more advanced in age the higher the frequency, especially for Depakote.

Once per year just to be sure they are taking it correctly.