Hey I know this question might not be in your wheelhouse, but I'm hoping that you might be able to at least point be in a direction with good resources.
I'm writing a story with a character who has an unusually high chance of heart attack in spite of their otherwise healthy lifestyle (for plot reasons), and I think I've landed on "rare lipid disorder" as the cause I want to go with, but I'm having trouble finding resources that really explain the various types beyond "it gives you really high ldl cholesterol!". I don't have any real medical training so I was hoping there's some commonly used resouce I just don't know about.
One thing you could search is "familiar hypercholesterolemia". The most common is heterozygous, where a person can live a normal lifespan if they do appropriate lab testing and take appropriate medications (though they may have xanthelasmas (blebs of cholesterol under the skin around the eyes- see picture above) or xanthomas (cholesterol deposits in joints and tendons). This would be caught whenever the person has their first screening blood test for cholesterol.
The less common type is homozygous, where a person has cholesterol so high (LDL of over 600) that they generally do not survive past age 30 unless they get a liver transplant. The xanthelasmas and xanthomas here are present at birth and this would be caught very quickly.
More information here: https://emedicine.medscape.com/article/121298-overview
