20 Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 39Copyright (c) 2005 John Wiley & Sons, Inc.Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 40Copyright (c) 2005 John Wiley & Sons, Inc.
Water hardness is a measure of the dissolved mineral content of water. There are two types: the general hardness (GH) and carbonate hardness (KH). When keeping freshwater fish and plants, the GH and the KH of aquarium water should match their natural habitat.
Why It Is Done. A test for growth hormone (GH) is done to: 1  See whether a child whose growth is abnormal has dwarfism or gigantism. 2  See whether an adult has acromegaly. This condition is caused by a tumor (adenoma) of the pituitary gland.  Check treatment that uses growth hormone.