ARUP's Laboratory Test Directory

Occult Blood, Fecal by Immunoassay : 2007190

Mnemonic: FOB IA

Methodology: Quantitative Immunoassay
Performed: Sun, Tue, Fri
Reported: Within 72 hours
Specimen Required: Collect: Stool.

Specimen Preparation: Patient will dip sampling bottle transfer wand into stool collection and place back into sampling bottle (ARUP Supply #49952. Available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787.

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Unpreserved stool.

Stability (collection to initiation of testing): Ambient: 15 days; Refrigerated: 30 days; Frozen: Unacceptable
Reference Interval:
Less than or equal to100 ng/mL
Interpretive Data: No single cutoff provides superior colorectal cancer detection rates. The test manufacturer recommends the use of a 100 ng/mL cutoff that produces a specificity of approximately 95 percent for the detection of lower gastrointestinal bleeding. This test does not detect upper gastrointestinal bleeding.
CPT Code(s): 83520
Cross References: Fecal Immunochemical Testing (FIT) (Occult Blood, Fecal by Immunoassay)