3 The operating characteristics of the prostate specific antigen test have been determined by comparing concentrations with the result of prostate biopsy.
In a study by Bloom et al. [261], they compared concentrations of various PFCs (PFDA, PFNA, PFHpA, PFHxS, PFOA, PFOS, FOSA, PFUnA) as well as free T4 [FT4] in the blood of 31 fishermen from New York.
Aronov et al. applied metabolomic analysis by mass spectrometry to compare concentration of plasma solutes of six haemodialysis patients without a colon, to that of nine patients with a colon [ 42], with as aim the identification of metabolites discriminating between these two groups.
The model was validated for CB-153 in women by comparing current concentrations of CB-153 to concentrations obtained from bio-banked samples from a rubella screening performed years earlier.
This was accomplished by comparing the concentrations of a broad suite of geochemical elements of soil mobilized by simulated rainfall from small plots to the source soil, in two contrasting agricultural regions in Canada.
The use of individual measurements of iAs in drinking water for exposure estimation was validated by comparing the concentrations of iAs in the currently used water with the concentrations of iAs metabolites in urine, which is considered a good indicator of ongoing exposure (Lindberg et al. 2006).
But uranium-lead dating, in which researchers estimate the age of a rock by comparing its concentrations of radioactive uranium and the lead it decays into, tells a different story.
The same conclusion was drawn by comparing plasma concentrations of triglycerides, leptin and insulin, all reported in Table 2.
We did this by comparing the concentrations of three metabolites that cover the pathway at 12 h following immune challenge.
