It has recently been proposed that the true upper normal limit of serum alanine aminotransferase (ALT) is much lower than that listed by the manufacturers of commercially available assays. The normal ...

A control chart consists of several parts. It has two control limits and an average line. The bottom dashed line is called the lower control limit (LCL). The solid middle line is the average of the ...

Black holes are regions of space where the density of matter becomes so high that space becomes sufficiently distorted that not even massless photons can escape the gravitational forces present.