What do blood tests mean?
Children’s creatinine changes with age and depends on how big they are and how much muscle mass they have. So, the interpretation of a creatinine value must bear this in mind.
The table below is a recommended set of age-related reference ranges for creatinine. These ranges were proposed at the Paediatric Laboratory Medicine Network (PaLMnet) meeting in 2014. PaLMnet is a subgroup of the Association of Clinical Biochemists Scientific Committee.
Of note:
- These recommended ranges apply to results obtained by enzymatic methods for creatinine estimation only.
- These are the preferred reference ranges for paediatrics.
- Abbreviations: Lower limit reference interval (LLRI), upper limit reference interval (ULRI).
| Age Group | Male (Creatinine µmol/l) | Female (Creatinine µmol/l) | ||
| Lower (LLRI) | Upper (ULRI) | Lower (LLRI) | Upper (ULRI) | |
| 0 – <14days | 27 | 81 | 27 | 81 |
| 14d – <1yr | 14 | 34 | 14 | 34 |
| 1 – <3yr | 15 | 31 | 15 | 31 |
| 3 – <5yr | 23 | 37 | 23 | 37 |
| 5 – <7yr | 25 | 42 | 25 | 42 |
| 7 – <9yr | 30 | 48 | 30 | 48 |
| 9 – <11yr | 28 | 57 | 28 | 57 |
| 11yr | 36 | 64 | 36 | 64 |
| 12yr | 36 | 67 | 36 | 67 |
| 13yr | 38 | 76 | 38 | 74 |
| 14yr | 40 | 83 | 43 | 75 |
| 15yr | 47 | 98 | 44 | 79 |
| 16yr | 54 | 99 | 48 | 81 |
| >16yr | Adult Range | Adult Range | ||
| 59 | 104 | 45 | 84 |