A thallium stress test is a nuclear imaging test that shows how well blood flows into your heart while youâre exercising or at rest. This test is also called a cardiac or nuclear stress test. During the procedure, a liquid with a small amount of radioactivity called a radioisotope is administered into one of your veins.
Peyronie's disease is a connective tissue disorder that causes scar tissue to form in the penis, and can be painful when the penis bends during erections. List Your Practice go
1 Without treatment, phenylalanine builds up in the blood and causes intellectual disability. 2  Down syndrome is an example of a chromosomal disorder. 3  Chromosomal disorders happen sporadically and are caused by too many or too few chromosomes, or by a change in structure of a chromosome. There are many genetic diseases associated with intellectual disability. 2  Some examples include PKU (phenylketonuria), a single gene disorder. 3  Due to a missing or defective enzyme, children with PKU cannot process a part of a protein called phenylalanine.