## Creatinine

##### Ordering Info & Methodology

Test Code

Cerner Synonyms

CRE

Creatinine and EGFR, Creatinine, Creatinine Random, Random Creatinine, Creatinine with eGFR

Turn Around Time

Methodology

Analyzed within 4 hours of receipt, 24/7. Available on a STAT basis.

Enzymatic, Roche cobas c

Ordering Guide

##### Specimen Requirements

Sample Type

Collection Container

Alternate Collection Containers

Lithium Heparin Plasma

Light Green

Gold, Red

0.5 mL

Seven days

Add on stability

This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.

Minimum Volume

Add On Stability

Collection and Shipping Requirements

Refrigerate. Send on ice pack.

##### Reference Intervals

Female Reference Interval

Age Category | Reference Interval | units |
---|---|---|

0 y - <12 m | 10-90 | umol/L |

12 m - <4 y | 10-50 | umol/L |

4 y - <7 y | 10-60 | umol/L |

7 y - <10 y | 30-60 | umol/L |

10 y - <14 y | 40-90 | umol/L |

14 y - <20 y | 45-90 | umol/L |

≥ 20 y | 50-90 | umol/L |

Male Reference Interval

Age Category | Reference Interval | units |
---|---|---|

0 y - <12 m | 10-90 | umol/L |

12 m - <4 y | 10-50 | umol/L |

4 y - <7 y | 10-60 | umol/L |

7 y - <10 y | 30-60 | umol/L |

10 y - <14 y | 40-90 | umol/L |

14 y - <20 y | 50-95 | umol/L |

≥ 20 y | 60-100 | umol/L |

##### Additional Notes

Measurement Uncertainty (MU)

Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.

Example

Reported sodium = 140 mmol/L

Sodium MU = 1%

Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L

Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.

3%

Measurement Uncertainty