Give presumptive test or confirmatory test for semen and explain the advantage, disadvantage and limitation of it
Answers
Answer:
Explanation:
Presumptive tests, in medical and forensic science, analyze a sample and establish one of the following:
The sample is definitely not a certain substance.
The sample probably is the substance.
For example, the Kastle–Meyer test will show either that a sample is not blood or that the sample is probably blood but may be a less common substance. Further chemical tests are needed to prove that the substance is blood.
Confirmatory tests are the tests required to confirm the analysis. Confirmatory tests cost more than simpler presumptive tests so presumptive tests are often done to see if confirmatory tests are necessary.
Similarly, in medicine, a presumptive diagnosis identifies the likely condition of a patient, and a confirmatory diagnosis is needed to confirm the condition.
Examples
Acid phosphatase test for semen
Cobalt thiocyanate test for cocaine
Duquenois-Levine reagent for marijuana
Kastle-Meyer test for blood
Malachite green test for blood
Marquis reagent for narcotics
Benzidine test for blood which changes from clear to blue in color with the presence of blood
Marquis test for alkaloids
Luminol, leuchomalachite green, phenolphthalein, Hemastix, Hemident, and Bluestar are all also used for blood testing