1 Due to the high degree of regio-and stereoselectivity (due to the concerted mechanism), the Diels-Alder reaction is a very powerful reaction and is widely used in synthetic organic chemistry.2  The reaction usually thermodynamically favourable due to the conversion of 2 &#960 -bonds into 2 new stronger &#963-bonds. Due to the high degree of regio-and stereoselectivity (due to the concerted mechanism), the Diels-Alder reaction is a very powerful reaction and is widely used in synthetic organic chemistry.
A standard echocardiogram or a fetal echocardiogram test usually takes about 30 to 60 minutes. A stress echocardiogram usually takes between 60 and 90 minutes.
Answers. Best Answer: Depending on how backed up the lab is it could take weeks, but the actual ELISA test only takes about 3 hours to complete. It is possible to get results the day of testing. Usually you make a followup appointment for about 6 weeks later to reconfirm the origional test.I would schedule a followup test just to be sure.t is possible to get results the day of testing. Usually you make a followup appointment for about 6 weeks later to reconfirm the origional test. I would schedule a followup test just to be sure.