I found this website a while ago, then came across it again today. I think it's really useful so thought I'd share. You may know about it already labtestsonline.org
Eg if you want to check what all the gobbledegook on your blood tests form means, you just click on Tests, then Tests Index, then there's an A-Z & you can look each one up. Or you can go into Conditions/Diseases, click on Lung Diseases, and it explains the tests involved with those.