Kg mass estimation model based on total body potassium tbk. Potassium 40 is a naturally occurring isotope found in a known amount 00118 in intracellular water and is not present in stored triglycerides. Thus repeated measurements of the serum potassium should be done. Its vital to the functioning of nerve and muscle cells. This procedure accurately determines the bodys total cell mass that is the active growing tissues in the body which in turn can be used to estimate fat free or lean body mass. Potassium can be measured in serum plasma lithium heparin or heparinanticoagulated whole blood.
The total amount of potassium in the adult body is about 45 millimole mmolkg body weight about 140 g for a 175 pound adult. 1 mmol 1 milliequivalent meq or 391 mg potassium 3. Therefore plasma and whole blood concentrations are 0107 mmoll lower than those in serum. A normal potassium level is between 36 and 52 millimoles per liter. Clin phys physiol meas 1987. Women contain 3540 mmol kg 1 of body weight and during childhood and in the elderly body potassium concentration is also lower than that for young men.
Whole body counting also called total body counting measures the amount of naturally radioactive potassium 40 40 k in the body total body potassium or tbk. A whole body skeletal muscle sm. Womersley j boddy k king pc durnin jvga. It is unknown whether the adult tbk sm prediction model is applicable for pediatric use. Your body needs potassium to function normally. Mmol measured by whole body 40k counting wbc was developed sm 00082tbk and validated in adults in a previous study.
Total body potassium tbk is a method for measuring body composition. A comparison of the fat free mass of young adults estimated by anthropometry body density and total body potassium content. Pubmed crossref google scholar. 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. Download citation total body potassium. Body potassium concentration is 4555 mmol kg 1 of body weight thus a 70 kg adult man contains approximately 135 g potassium.
21 medium in which measured 1. Potassium is released from platelets during clotting. A reference measurement for the body cell mass the quantitative in vivo measurement of radioactivity in the human body began with the development of. Its important to note. Most potassium resides intracellularly and a small amount is in extracellular fluid 2 4. Total body potassium measurementthe effect of fallout from chernobyl.
Gallery of Total Body Potassium Measurement
