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They reorganize everything we know about alzheimer's disease. >> learning more about these presupr precursors help us protect ourselves and find out if we have it. >> they don't assure or guarantee someone is going to get alzheimer's disease. these are laboratory studies that research has confirmed a high correlation, meaning if you're not having symptoms but you have these abnormal levels, you might think about options for treatment to protect yourself in the years ahead. >> okay, now let's talk about the biomarker tests. what are they and how do they measure the biological changes in the bra...

P.e.t. scans. this decreases in time. then there's a series of blood tests, tests for carrier genes, and spinal fluid tests, looking for amaloid and other proteins we know are dangerously associated with alzheimer's disease. >> since we know there's no cure for alzheimer's, what kind of benefits are we learning from the idea of diagnosing it very early? >> fredricka, if i told you one year from today, your house was going oo be robbed, i have a strong feeling you would spend a lot of team over the next year protecting your property to protect yourself from the possible robbery. same thing goes...

Dad. dr. bill lloyd joins me from san antonio, texas. dr. bill, let me ask you this, how did they arrive at this conclusion? this is quite a finding. >> it's a very interesting story about the inheritance of alzheimer's and they didn't use genes or fancy blood tests or biomarkers to get to this information. they brought together a group of 53 healthy adults at the university of kansas. these were senior citizens, they were all tested and none of them had alzheimer's. then they went back and checked their family history. guess what, 11 of those 53 had a mom with alzheimer's, 10 had a dad with a...

In the next several months, duerson's brain tissue will also be studied, and perhaps the questions he grappled with just before his death will provide answers for fellow athletes that are still living. >> i only hope that it really makes a difference and that once they find out what the cause is, that the nfl takes a stand and say, okay, we're going to try to alleviate this problem, because if you don't, then all of this was for nothing. it's such an unbelievably difficult time for them. and i will tell you that david duerson's family has respected his wishes. and as difficult as this is to ta...

>> so that they're not left, so they're not breathing, deprived of oxygen to the brain which will cause more damage, it's all very critical. as in the congresswoman's case, maybe to get to a level one trauma service where service is availability to immediately alleviate the pressure and bleeding at the brain will save the critical brain tissue so the patient will have maximum opportunity for recovery. i think those are all positive factors in this case and is part of the reason why we're seeing such a good recovery at this point. >> part of her recovery depends on being in a stimulating enviro...