Did you start on statins after the initial CAC test? I believe statins are known to calcify the soft plaque which leads to a higher CAC score. That calcification is thought to stabilize the plaque (a mostly good thing).

I have high lipoprotein(a), which I gather can lead to blockages, and medications to reduce it are still experimental (as I understand it). I haven’t been diagnosed long enough to have a second scan. I am not even sure my cardiologist would prescribe it. (If there were more than one in my area, I’d consider changing perhaps.) But it’s the high lipoprotein(a) that scares me the most. The lipoprotein(a) might be something to discuss with your cardiologist.