-transparent.png){kind=logo}
We describe a method for the fast calculation of total fractional calcium absorption (TFCaA) by the double-isotope technique (45Ca orally and 47Ca intravenously). The gamma- and beta-activities of plasma or urine samples were measured simultaneously. 47Ca activity was obtained by a gamma-ray spectrometer after exclusion of scandium 47. The 45Ca activity was measured directly by subtracting the 47Ca plus 47Sc component from the total beta-activity. In addition, 45Ca activity was determined after 8 weeks, to allow for 47Ca and 47Sc decay. There was good correlation between these two methods of measuring 45Ca activity. TFCaA was calculated both by deconvolution taken as a reference method and from the equilibrium quotient 45Ca/47Ca observed in several blood or urine samples collected at different times. The most convenient sampling time for calculation of this ratio was reappraised, taking into account the type of solution ingested orally (water or milk). The results indicate that simultaneous counting of gamma- and beta-activities of an appropriate plasma or urine sample provides a good and rapid measure of the calcium absorption. This method is considered to be useful as a clinical tool.
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
November 1965,
The Journal of laboratory and clinical medicine,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
January 1984,
The British journal of nutrition,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
January 1978,
Medecine & chirurgie digestives,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
January 1975,
The Netherlands journal of medicine,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
January 1970,
Calcified tissue research,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
January 1973,
Srpski arhiv za celokupno lekarstvo,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
November 1965,
British journal of haematology,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
July 1974,
Journal of nuclear medicine : official publication, Society of Nuclear Medicine,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
January 2011,
Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA,
M Griessen, and
A Jung, and
B Cochet, and
P Bartholdi, and
J M Gaspoz, and
F Infante, and
A Donath, and
E Loizeau, and
B Courvoisier
September 1980,
Clinical science (London, England : 1979),
