Creatinine, Serum or Plasma
Also known as: CRT
Use
The Creatinine, Serum or Plasma test is a screening test used to evaluate kidney function. It helps in the assessment of kidney health by measuring the level of creatinine in the blood, an indicator of how well the kidneys are filtering the blood. It is useful for diagnosing and monitoring conditions such as acute kidney injury, chronic kidney disease, and other kidney function-related diseases.
Special Instructions
This test has been approved by New York State. It requires either a plasma separator tube or a serum separator tube for collection. Proper handling includes allowing the serum tube to clot completely at room temperature and separating the serum or plasma from cells within 2 hours of collection.
Limitations
Assay interference may occur when high concentrations of N-acetylcysteine (NAC) are present. Negative interference has also been reported with NAPQI, an acetaminophen metabolite, at concentrations typically expected during acetaminophen overdose. These interferences can potentially affect the accuracy of the results.
FDA ApprovedNew York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 2160-0
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL
Minimum Volume
0.2 mL
Container
Plasma separator tube or serum separator tube
Collection Instructions
Allow serum tube to clot completely at room temperature. Separate serum or plasma from cells within 2 hours of collection. Transfer to an ARUP standard transport tube.
Storage Instructions
Refrigerated
Causes for Rejection
Specimens obtained through catheters used to infuse hyperalimentation fluid. Specimens with potassium oxalate/sodium fluoride, citrate, or EDTA as anticoagulants.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 week |
| Refrigerated | 1 week |
| Frozen | 3 months |