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 EURAMET.QM-K12
MEASURAND : Mass fraction of creatinine in human serum
Material II - elevated range
Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in relative terms
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
CCQM-K12 and EURAMET.QM-K12
MEASURAND : Mass fraction of creatinine in human serum
Material II : elevated range
Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in relative terms
Dark blue indicates participants in CCQM-K12 (Material II)
Blue indicates participants in EURAMET.QM-K12 (Material A)
Green indicates participants in EURAMET.QM-K12 (Material B)
The degrees of equivalence expressed in µg/g, and the pair-wise degrees of equivalence expressed in µg/g given below are for participants in CCQM-K12 only.
| Lab i | Di | Ui |
| / (µg/g) | / (µg/g) | |
| IRMM | 0.075 | 0.487 |
| KRISS | -0.106 | 0.331 |
| LGC | -0.031 | 0.125 |
| NIST | 0.063 | 0.205 |
| PTB | 0.073 | 0.161 |
Results are presented under A4 printable format in Summary Results (PDF file).
| 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 |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
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 EURAMET.QM-K12
MEASURAND : Mass fraction of creatinine in human serum
Material II - elevated range
|
The key comparison reference value, xR, is calculated as the mean of the participants' results excluding IRMM: xR = 18.645 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. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = Di - Dj = (xi - xR) - (xj - xR) = (xi - xj) and Uij, its expanded uncertainty corresponding to a 95% level of confidence, both expressed in µg/g. |
|
The linkage is obtained through the common participation of PTB and LGC in both key comparisons and is explained on page 14 of the EURAMET.QM-K12 Final Report. |
No pair-wise degrees of equivalence involving participants in EURAMET.QM-K12 only have been computed.
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
CCQM-K12 and EURAMET.QM-K12
MEASURAND : Mass fraction of creatinine in human serum
Material II - elevated range
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
MEASURAND : Mass fraction of creatinine in human serum
xi-EUR : result of measurement carried out by laboratory i participating in EURAMET.QM-K12
ui-EUR : combined standard uncertainty of xi-EUR
Material A - high level
Material B - low level
