Creatinine
| Analyt: | Creatinine |
| Matrix: | Serum, Urine |
| Measuring Method: | GC-ID/MS |
| Standard: | Creatinine NIST 914a |
| Internal Standard: | ¹³C₁-Creatinine |
| Sample Processing: | Samples are spiked gravimetrically with internal standard and equilibrated, ultrafiltered and the creatinine separated with HPLC using a C18-column. Derivatisation is with MBDSTFA in pyridine. |
| Measurement: | Measurement at m/z 298 and m/z 299 |