When it comes to labs and blood work, it’s difficult to know exactly what to ask for. To lend some clarity to the confusing topic, we chatted with a handful of top integrative and functional M.D.s about what they’d consider their “top picks.” In addition to the seven blood tests you should ask for at your annual physical, you may want to bring up these tests if you have a family history of cancer, autoimmune disease, or heart disease.