CCQM-K12 and CCQM-K12.2
MEASURAND : Mass fraction of creatinine in human serum
Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in µg/g.
Red diamonds: CCQM-K12
Blue squares: CCQM-K12.2
CCQM-K12 and CCQM-K12.2
MEASURAND : Mass fraction of creatinine in human serum
Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in µg/g.
| c |
Information is available in Summary Results
| Metrology area, Sub-field | Chemistry and Biology, Organics |
| Description | Creatinine in human serum |
| Time of measurements | 2012 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Mass fraction |
| Transfer device | Frozen serum materials |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | This is a subsequent key comparison to CCQM-K12. Results published on 15 June 2018 Creatinine in human serum CCQM-K12.2 results are linked to those of CCQM-K12 for Material I (7 µg/g to 8 µg/g)
|
| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | M.J. Welch +1 301 975 3100 |
| Pilot laboratory | |
|---|---|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| HSA |
Health Science Authority, Singapore, APMP |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LNE |
Laboratoire national de métrologie et d'essais, France, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NIMT |
National Institute of Metrology (Thailand), Thailand, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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CCQM-K12 and CCQM-K12.2
MEASURAND : Mass fraction of creatinine in human serum
|
The key comparison reference value, xR, is calculated as the mean of the participants' results excluding IRMM: xR = 8.217 µg/g. |
| The degree of equivalence of each laboratory with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty corresponding to a 95% level of confidence, both expressed in µg/g. |
Linking CCQM-K12.2 to CCQM-K12
An independent key comparison reference value was assigned from the mean, standard deviation, and pooled standard uncertainty of the results reported by the three reference laboratories KRISS, NIST and PTB and the participants.
CCQM-K12 and CCQM-K12.2
MEASURAND : Mass fraction of creatinine in human serum
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
CCQM-K12
CCQM-K12.2
