Label Mnemonic: CRTO
Epic Lab Code: LAB65
Downtime Form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
6240 RCP
Body Fluid
(e.g., surgical drain, pericardial, peritoneal, peritoneal dialysis, pleural, or synovial)
Collection Medium:
Red top tube 5 mL (Clot Activator)
1 mL fluid in red top tube
Rejection Criteria:
Plasma, serum, urine, or cerebrospinal fluid.
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
No established reference range (see Test Limitations)
Test Limitations:
This test is not approved by the FDA for this sample type. Performance characteristics and reference range have not been verified. A published study using Roche Diagnostics cobas 8000 analyzers has demonstrated that analysis of creatinine in vitreous fluid shows no evidence of systematic matrix interference. Results should be interpreted in conjunction with clinical findings.

Reference: Owen WE et al. Body fluid matrix evaluation on a Roche cobas 8000 system. Clinical Biochemistry 2015; 48(13-14):911-914.
Enzymatic colorimetric
CPT Code:
See also:
Creatinine, Plasma