Total-body calcium estimated by delayed gamma neutron activation analysis and dual-energy X-ray absorptiometry

Total body calcium (TBCa) in 270 black and white women age 21-79 years was measured concurrently by delayed gamma neutron activation analysis (DGNA) and dual-energy X-ray absorptiometry (DXA). The mean value for TBCa calculated from DXA was 933 g compared with 730 g for DGNA. By regression, TBCa(DXA...

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Veröffentlicht in:Osteoporosis international 1999-11, Vol.10 (6), p.510-515
Hauptverfasser: ALOIA, J. F, MA, R, VASWANI, A, FEUERMAN, M
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description Total body calcium (TBCa) in 270 black and white women age 21-79 years was measured concurrently by delayed gamma neutron activation analysis (DGNA) and dual-energy X-ray absorptiometry (DXA). The mean value for TBCa calculated from DXA was 933 g compared with 730 g for DGNA. By regression, TBCa(DXA(g)) = 1.35 x TBCa(DGNA(g)) -54 (r = 0. 90, r(2) = 81.4%, SEE = 66.9 g). This remarkable difference of 203 g suggests that one or both these methods is not accurate. Adjustment of the regression of DXA versus DGNA for body mass index or trunk thickness explained 8.5-10% of the variability between methods. The unadjusted slope for the DXA values regressed against the DGNA values was 1.35, indicating significant discordance between the methods. There is greater agreement between the two DGNA facilities (Brookhaven National Laboratory and Baylor College of Medicine) and between the various DXA instruments. Either DGNA underestimates TBCa or DXA overestimates total-body bone mineral content. Resolution of these disparate results may possibly be achieved by concurrent measurement of whole human cadavers of different sizes with chemical determination of the calcium content of the ash. In the interim, cross-calibration equations between DGNA and standardized values for DXA for total-body bone mineral content may be used, which will permit reporting of consistent values for TBCa from the two technologies.
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subjects Absorptiometry, Photon - methods
Adult
Aged
Biological and medical sciences
Body Composition
Calcium - analysis
Calcium - metabolism
Female
Humans
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Middle Aged
Neutron Activation Analysis - methods
Osteoarticular system. Muscles
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
title Total-body calcium estimated by delayed gamma neutron activation analysis and dual-energy X-ray absorptiometry
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