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reference measurement
Development and evaluation of a candidate reference measurement procedure for the determination of testosterone in human serum u
      
A candidate reference measurement procedure for total testosterone in human serum involving isotope dilution (ID) coupled with liquid chromatography/tandem mass spectrometry (LC/MS/MS) has been developed and critically evaluated.
      
Evaluation of resistivity data comprises modified double mass calculations versus data from reference measurement sites, which enables detection of contamination although it influences the resistivity less than the natural seasonal variations.
      
The results exhibit very good agreement with a reference measurement performed with a fast FTIR Spectrometer.
      
These data were compared to a reference measurement (saturable detector sampling scheme); the results show that the interarrival time weighting method compares favorably with the reference measurement under the present conditions.
      
Although the method requires a DC reference measurement at each calibration point, the resulting calibration is accurate for both average and unsteady measurements up to the full bandwidth of the sensor.
      
This technique allows absolute temperature measurements by determining the relative intensities on two adequate spectral bands of the same dye and a reference measurement at a known temperature.
      
The calculations of calcium dynamics are based on continuous recordings of fura-2 fluorescence intensity at one excitation wavelength after an initial reference measurement at two excitation wavelengths.
      
Metrology in laboratory medicine - Reference measurement systems
      
The present availability of reference measurement procedures and primary calibrators is shown to be insufficient to obtain international comparability of all types of quantity in laboratory medicine.
      
It states that "traceability of values assigned to calibrators and/or control materials must be assured through available reference measurement procedures and/or available reference materials of a higher order".
      
In the German proficiency testing system, statutory use of reference measurement procedures for several measurands has been in force since 1988.
      
In many cases, the measured substances are heterogeneous mixtures where traceability can be established only to either an international conventional reference measurement procedure or to a manufacturer's own in-house reference system.
      
There is a need for the further development of suitable reference measurement systems, but in view of the multitude of tasks and limited resources, priorities need to be set.
      
Reference measurement systems for food analysis: CCQM focus group meeting (13 September 2004)
      
According to ISO/CD 18113-1:2005, the conventional true value of a control material can be an assigned value (obtained with a primary or reference measurement procedure), a consensus value or a procedure-defined value.
      
Networks of reference measurement laboratories in laboratory medicine-activities of the Joint Committee on Traceability (JCTLM,
      
Within the last decade, the IFCC HbA1c standardization network has established the metrologically highest reference measurement procedure for HbA1c testing.
      
The RM certified value, like other results of chromatographic purity determination traceable to the reference measurement procedure, is not traceable directly to the SI mole.
      
Prior to this study, NIST developed a candidate reference measurement procedure based upon isotope dilution liquid chromatography/tandem mass spectrometry.
      
 

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