One of the methods that scientists can use to determine the toxicity of a chemical compound is an LD50 test. This test involves introducing different dose levels of the compound to be tested to a group of experimental subjects. The most commonly used experimental subject is lab rats or mice, because they have many physiologic similarities to humans.
Consider the LD50 graph of Drug X above. Draw a vertical dashed line starting at 10 mg/kg on the x-axis and ending on the graphed line. Draw a horizontal line starting at 50% on the y-axis and ending on the graphed line. This is the LD50 of Drug X.
What is the LD50 level of Drug X?
