REPRODUCIBILITY OF REPEATED TOTAL BODY WATER MEASUREMENTS WITH TRITIUM.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1969
- Accession Number
- AD0695786
Entities
People
- Donald F. Logsdon Jr.
- James F. Green
- John W. Harper
Organizations
- United States Air Force School of Aerospace Medicine