Chemistry Specimen Processing
Separate serum/plasma from blood cells within 2 hours
- For serum, need to wait for specimen to clot first (20-30 min)
| Analyte | Specimen Type | Collection Media | Collection Notes | Reference Interval |
|---|---|---|---|---|
| Creatinine | Urine, 24 hour | |||
| Blood serum | Lithium heparin | |||
| Urea | Blood serum or plasma | Lithium heparin | 2.1 - 7.1 mmol/L | |
| Urine, random | Use thymol preservative and refrigerate | |||
| Urine, 24 hour | Use thymol preservative and refrigerate | 430 - 710 mmol/day | ||
| Uric Acid | Blood serum or plasma | Lithium heparin | ||
| Urine, 24 hour | ||||
| Urinalysis | Urine, first morning midstream clean-catch preferred | Fresh samples <2h old |
Special Samples:
- Keep on ice
- Blood gases
- Ammonia
- Protect from light
- Bilirubin
- Vitamin B12