Color and transparency are determined from visual observation of the sample. Normal urine is straw yellow to amber in color. Abnormal colors include bright yellow, brown, black (gray), red, and green. These pigments may result from medications, dietary sources, or diseases.
limulus amebocyte lysate test. limulus amebocyte lysate test. LAL test. A test used to detect minute quantities of bacterial endotoxins and to test for pyrogens in various materials; it is also used to detect septicemia due to gram-negative bacteria. Limulus amebocyte lysate is formed from the lysed circulating amebocytes of the horseshoe crab (Limulus polyphemus).
A litmus test is a chemistry lab test use to sort acids and bases. It is an obvious reaction and an old one. Of itself, it has nothing to do whatever with politics. The term litmus test has been applied to several non-science situations and it merely means that something will be shown to be true or false in a given situation.