1. Measurement of body compartments in children: whole-body counting and other methods
- Author
-
David Lin and Richard N. Pierson
- Subjects
Male ,Radioisotope Dilution Technique ,Adolescent ,Sodium ,Body water ,chemistry.chemical_element ,Absorption (skin) ,Growth ,Iodine ,Whole-Body Counting ,Sex Factors ,Body Water ,Extracellular fluid ,Medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Plasma Volume ,Child ,Body fluid ,Whole body counting ,business.industry ,Body Weight ,Age Factors ,Infant, Newborn ,Infant ,Body Height ,Body Fluids ,chemistry ,Child, Preschool ,Lean body mass ,Body Composition ,Potassium ,Female ,business ,Nuclear medicine ,Extracellular Space ,Biomedical engineering - Abstract
Body compartments which are readilymeasured by radiotracers, including plasma volume, red cell mass, body water, and extracellular fluid, can also be measured by more difficult but available nonisotopic methods in order to reduce radiation exposure. Radiotracer studies of these spaces may be carried out with minimized doses of radioactivity when the clinical situation so requires. Whole body-counting is an elegant means of reducing whole body radiation to a minimum in absorption and turnover studies, as for iodine, calcium, iron, sodium, or vitamin B 12 . Total body potassium measured from naturally occurring 40 K is particularly useful in measuring lean body mass as a part of body composition studies in children without administering additional radioactivity. Since most body fluid spaces change rapidly with growth but are closely a function of lean body mass, prediction of normal for a given age and sex can be made more accurately if lean body mass is known. Normal data for this parameter are presented.
- Published
- 1972