Creatinine, Body Fluid
Use
This test is useful for identifying the presence of urine as a cause for accumulation of fluid in a body compartment. It also measures the ultrafiltration capacity of the peritoneal membrane in patients receiving peritoneal dialysis, which is crucial for monitoring dialysis efficiency and detecting any complications such as urine leakage into body compartments, which can occur due to trauma or obstruction.
Special Instructions
Ensure that the date and time of collection are accurately recorded and that the specimen source is indicated on the label. If not ordering electronically, complete and send a Renal Diagnostics Test Request form with the specimen.
Limitations
Interfering substances such as rifampicin, levodopa, and certain calcium dobesilates can result in falsely low creatinine results. Methyldopa and Dicynone at certain concentrations may also result in incorrect readings. Additionally, elevated levels of substances like N-acetyl-p-benzoquinone imine and other drugs may lead to decreased accuracy of the test results. In rare cases, gammopathy, particularly type IgM, may affect reliability.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 12190-5
- 12190-5
- 14725-6
Result Turnaround Time
0-2 days
Related Documents
For more information, please review the documents below
Specimen
Body Fluid
Volume
1 mL
Minimum Volume
0.5 mL
Container
Plastic vial
Collection Instructions
Centrifuge to remove any cellular material and transfer into a plastic vial. Indicate the specimen source and source location on label.
Causes for Rejection
Gross hemolysis, Gross lipemia, Gross icterus, Anticoagulant or additive, Breast milk, Nasal secretions, Gastric secretions, Bronchoalveolar lavage (BAL) or bronchial washings, Colostomy/ostomy, Feces, Urine, Saliva, Sputum, Vitreous fluid
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 24 hours |
| Refrigerated | 7 days |
| Frozen | 30 days |