Frederik Barry Bang (1916–1981) was an American medical researcher who developed the Limulus amebocyte lysate (LAL) test for bacterial endotoxins.

Based upon their observations, they found that horseshoe crab blood clots in the presence of gram-negative bacteria that cause pneumonia and meningitis, thus providing a testing medium.

[3] The LAL test can return a result in as little as 45 minutes and can detect the presence of endotoxins at levels of less than one part per trillion, and it is used in pharmaceuticals and medical devices that come in contact with blood.

[5] While serving in the United States Army Medical Corps, he directed research studies on malaria and other tropical diseases in Australia, New Guinea, the Philippines and Japan.

[4] Bang died in 1981 in New York City of a heart attack while traveling to Sweden and West Germany to present scientific papers.