Pierson rn jr editor. To measure total cell mass equipment required.
Hypokalemia Emcrit Project
Total body potassium measurement. A normal potassium level is between 36 and 52 millimoles per liter. Usefulness of bioelectric impedance and skinfold measurements in predicting fat free mass derived from total body potassium in children. Total body potassium measurementthe effect of fallout from chernobyl. Schaefer f georgi m zieger a. Clin phys physiol meas 1987. Pubmed crossref google scholar.
When this measurement is combined with measurements from the total body protein you can determine total organ and muscle mass. Extremely sensitive equipment which measures the gamma rays emitted from the naturally occurring radioactive isotope of potassium known as 40k. Many methods have been developed over the past century with one of the earliest measures of body composition being total body potassium counting tbk which was first recognized in 1950s. Your body needs potassium to function normally. Total body potassium was measured in 103 healthy adults using a shadow shield whole body monitor of high sensitivity. In the entire extracellular fluid which is approximately 20 of body weight or 14 l in a 70 kg person the total potassium content is 50 to 60 mmol.
Thus repeated measurements of the serum potassium should be done. Smaller organ tissue mass in the elderly fail to explain lower resting metabolic rate. The range of height was 147 to 192 cm of weight 43 to 92 kg and of age 18 to 77 years. Quality of the body cell mass body composition in the third millennium. Gallagher d allen a wang zm heymsfield sb krasnow n. A comparison of the fat free mass of young adults estimated by anthropometry body density and total body potassium content.
In an averaged size adult with a normal serum k of 4 meql a total body k deficit of 200400 meq is required to produce a decrease in plasma k of 1 meql. A reference measurement for the body cell mass. Fat free mass can be estimated from the total body k based on any one of several conversion factors which may vary in men from 246 to 341g k per kg of fat free mass and in women from 228 to 316 grams per kilogram. After measurement of 40 k radiation from the body as described above calculation of total body potassium k for the data is required. The values obtained for total body potassium were correlated with height with weight and with height and weight. Womersley j boddy k king pc durnin jvga.
The total amount of potassium is usually on the order of 50 mmolkg of body weight so a 70 kg individual has a store of about 3500 mmol of potassium. Its vital to the functioning of nerve and muscle cells.
Gallery of Total Body Potassium Measurement
