Name: Leukocytes, Fecal
Test Name: Leukocytes, Fecal
Health Link Test Code: FECWBC
LIS Test Code: FLEUK
CPT Code(s): 83630
Methodology: Immunochromatographic Assay
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.
Collection Container: Sterile screw cap container
Collection Volume: 1 mL
Pediatric Collection Volume: 1 mL
Testing Volume: 0.5 mL
Pediatric Testing Volume: 0.5 mL
LIMIT: One specimen every 7 days.
Interpretation Type: Expected Results
False negative test may occur in immunocompromised patients.
False positives may occur in breastfed infants.
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.