I have ITP (105k), and need to extract a decayed wisdom tooth. When molar was extracted, took 2 hours and stitches to reduce bleed. Is this risky?

Number is good. But not the sole factor, other routine precautions such as stopping drugs like blood thinners, aspirin, NSAIDs, etc.., are important together with being fit for surgery anyhow. Ideally your dentist/dental surgeon should confer with your doctor before the procedure, good luck.