Serum from patients was pooled, filtered, dispensed and frozen. The serum pool obtained
was used for accuracy control in twenty-one participating laboratories in the Stockholm area …

Serum from patients was pooled, filtered, dispensed, and frozen. This pooled specimen was
used for accuracy control in 64 participating laboratories in Sweden. Mean values (" state-of …

An Isotope dilution mass spectrometrlc (ID/MS) method for serum creatinine Is described
which uses creatlnlne-13C2 as the labeled Internal standard. Creatinine Is separated from …

We review recently developed reference methods based on mass fragmentography (specific
ion monitoring) with use of isotope-labeled internal standard, for determination of …

Isotope dilution mass spectrometry with liquid chromatography for the determination of
serum creatinine is studied. After adding labeled (15N2) creatinine to the serum, creatinine …

Determination of Creatinine in Human Serum by Isotope Dilution-Mass Spectrometry Page 1 L.
Siekmann: Determination of creatinine by isotope dilution-mass spectrometry \37 J. Clin. Chem …

A method for the measurement of uric acid in human serum by isotope dilution-mass
spectrometry is described. The analytical procedure consists of the following Steps:(1) …

1666 CLINICAL CHEMISTRY, Vol. 25, No. 9, 1979 obtained was due to the technique; four
readings of absorbance are required, only a small change in absorbance (0.056 A per 0.1 …

[en] The review covers typical or important examples of stable isotope usage in clinical fields
during the period since the last triennial mass spectrometry conference in 1973. Items are …

i Summary: The use of reference method procedures in clinical chemical analysis is
advocated by many experts i äs the most reliable approach to obtaining accurate results …