Danney et al,

When I called to inquire, express interest, find out more etc... I was able to speak with the nurse practioner directly involved in the study. (very pleasant by the way)
Allow yourself plenty of time on the phone to hear the details. (It’s not a two minute phone call) We had the dates set before the conversation was done.
IF you were to participate in the study the travel dates would be Monday - Wednesday. You need to arrive by Monday night so that you can be at NIH first thing in the morning on Tuesday. Tuesday would be all the non invasive testing - no blood draws on Tuesday. First thing Wednesday morning there would be the fasting blood labs and other blood tests. Wednesday’s blood draw is not much different than a regular Endo appt. blood draw - same tests plus a few extra. By 11:30 AM "ish" everything will be done and you are free to head home.
While you are there you would be staying at the Children’s Inn.
http://www.childrensinn.org/
We have stayed there before. They are great at the Inn.
I highly recommend that you explore their website for added details and information.
IF you plan to go to NIH and you are hoping to see the area...
There is a metro stop on the NIH campus. You could take the metro into Washington DC to see the National Zoo... the Air and Space museum... the Washington Monument...etc... LOTS to do or see. You MIGHT have time for ONE thing before having to fly back home.
Also know that spring break is the time that many schools from all over the U.S. use as field trip time to take a group of kids to... Washington DC. It will be crowded. Well, if you are from a small town... consider it crowded and busy all the time any time. : )

Susan