Look up the words in a medical dictionary or on the internet. Take a course in terminology. Most technical schools offer evening classes in terminology. Ask a trusted friend if they know what the terms or tests mean. Call your local Agency on Aging or the Alzheimer's Association in your area.
Many organizations have printouts and pamphlets outlining the commonly used medical terms.
The best and most important thing to do is ASK . Stop the doctor or nurse and ask them to explain what they just said to you. If they don't or won't, find a new doctor. We must always be our own and our loved ones' advocate. It can be found on their home page under their Resources heading.