Sep 21, 2016




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Microbiology

Leukocytes, Fecal

Leukocytes, Fecal (FECWBC) Microbiology Lab Test

Name: Leukocytes, Fecal

Test Name: Leukocytes, Fecal

Health Link Test Code: FECWBC

LIS Test Code: FLEUK

CPT Code(s): 83630

Methodology: Immunochromatographic Assay

Clinical Information:

Detects the presence of leukocytes in stool: a positive test indicates inflammation which may be infectious or noninfectious, e.g. Crohns disease and ulcerative colitis.


"Routine examination of stool for fecal leukocytes is not recommended as a test for predicting bacterial infection or for selective testing for stool pathogens." Guerrant R, et al. Practice guidelines for the management of infectious diarrhea. Clin Infec Dis 32:331-50, 2001

Days Performed: Daily, 0700 - 2230.

In-Lab Turnaround Time: 8 hours.

Stat In-Lab Turnaround Time: Not available stat.

Specimen: Stool

Collection Container: Sterile screw cap container

Collection Volume: 1 mL

Pediatric Collection Volume: 1 mL

Stability Ambient:

2 weeks

Stability Refridgerated:

2 weeks

Stability Frozen:


Testing Volume: 0.5 mL

Pediatric Testing Volume: 0.5 mL

Unacceptable Criteria:

LIMIT: One specimen every 7 days.



Interpretation Type: Expected Results

Test Limitations:

False negative test may occur in immunocompromised patients.


False positives may occur in breastfed infants.

Additional Information:

Infectious agents that cause inflammation include Shigella, Salmonella, Campylobacter, and enteroinvasive E. coli. Infectious agents that cause noninflammatory diarrhea include Vibrio species, enterotoxigenic E. coli, most parasites, all viral agents of gastoenteritis, and CMV. Clostridium difficile may or may not be accompanied by inflammation.