Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test samples.

Conflicting findings are often reported in microbiome association studies, which could be due to insufficient sample sizes and numerous confounders. A new study, utilizing two large-scale human ...

In a new study, researchers found high levels of ultrashort-chain per- and polyfluoroalkyl substances (PFAS) in blood samples taken from Wilmington, N.C. residents between 2010-2016. Two ...

Tiny micro- and nanoplastic fragments seem to be turning up everywhere, including one of the most well-protected parts of the ...

The clinical application of PD-L1 immunohistochemistry (IHC) testing is complicated by the availability of multiple IHC assays, scoring algorithms, and cutoffs. This study assessed the analytical ...