Stool samples can help doctors diagnose some health conditions. Tips for collecting a stool sample include urinating before collecting the sample and using any tools that the sample kit provides.

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Representative sampling and random sampling ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An early analysis ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Bottom-up MS-based proteomics involves the separation of peptides by liquid chromatography (LC), coupled to electrospray ionization and peptide analysis in the mass spectrometer. Sample preparation in ...