How far back does meconium go?

Meconium begins to form between the 12th and 16th week of gestation. Meconium drug testing can detect maternal drug use during the last 4 to 5 months of pregnancy. A negative result does not exclude the possibility that a mother used drugs during pregnancy.

What is the difference between a presumptive and confirmatory test?

Presumptive tests, such as those where a color change occurs, are those that usually identify a class of compounds whereas a confirmatory test, such as mass spectrometry, is one that conclusively identifies a specific, individual com- pound.

Do they drug test at labor and delivery?

Evaluation and Interpretation of Results Drugs administered to the mother during labor and delivery may be detected in meconium or umbilical cord tissue. Drugs administered to the newborn after birth may be detected in meconium if the meconium is collected after drug administration.

What is the LC50 test?

The LC50 and LC20 tests use multiple concentrations of material diluted in laboratory water and determines the concentration of that is lethal to 50\% and 20\% of the test fish respectively. Parallel testing with and without pH stabilization is recommended to demonstrate the presence of ammonia toxicity.

Which method test has been used in toxicology for testing neurotoxicity?

The Animal Test(s) Neurotoxicity testing for regulatory purposes is based on in vivo animal test methods. Four Organisation for Economic Co-operation and Development (OECD) Test Guidelines (TGs) describe in vivo neurotoxicity studies.

What are the different tests performed in the determining distinguishing and confirming human blood from other stains?

Confirmatory tests for blood include identification of blood cells under a microscope [Shaler, 2002], crystal tests such as the Teichman and Takayama tests [Shaler, 2002; Spalding, 2003], and ultraviolet absorption tests [Gaensslen, 1983].