Accession Number : AD0695786

Title :   REPRODUCIBILITY OF REPEATED TOTAL BODY WATER MEASUREMENTS WITH TRITIUM.

Descriptive Note : Final rept. Aug 68-Jan 69,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s) : Logsdon,Donald F. , Jr. ; Green,James F. ; Harper,John W.

Report Date : JUL 1969

Pagination or Media Count : 13

Abstract : The reproducibility of repeated measurements of total body water (TBW) in the same individual, by means of an isotope technic, was dependent on the percentage clearance of the isotope per week and the interval between determinations. Sudies of six normal subjects, with percentage clearances ranging from 41% to 80% per week, showed that a sample-to-background counting rate ratio of at least 2:1 was necessary to obtain reproducible values. The variance was found to be about 1%, or plus or minus 0.5 liter. The 2-week interval was the minimal time interval which gave reproducible values for individuals having a percentage clearance within normal limits (45% to 95%). (Author)

Descriptors :   (*BODY FLUIDS, MEASUREMENT), TRITIUM, WATER, RADIOBIOLOGY, MEDICINE, LABELED SUBSTANCES

Subject Categories : Medicine and Medical Research
      Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE