UCSF Navigation Bar

UCSF Departments of Pathology & Laboratory Medicine Home Page

Lab Manual for Moffitt-Long and Mount Zion

Lab Manual for SFGH

Internal Resources

Click here for more information about laboratory operations and procedures

Hepatitis B Core Antibody, IgM

Item Value
Approval req'd? No
Available Stat? No
Test code CORM
Test group Hepatitis
Performed by Immunology
In House Availability Twice per week
Method Chemiluminescent Immunoassay
Container type Gold top
Amount to Collect 1 mL blood
Sample type Serum
Preferred volume 0.5 mL serum
Min. Volume 0.25 mL serum (this volume is insufficient for repeat testing if needed)
Processing notes Refrigerate sample
Normal range Negative
Synonyms HBcAb, IgM; HBV; HBV; anti-HBc; anti-HBcAg
Stability Refrigerated 6 days
Turn around times 1-8 days
Additional information The antibody found earliest in acute HBV infection, IgM will usually be present during the "window" period after HBsAg production has declined to undetectable levels, often before anti-HBs is measurable. It usually persists for up to 6 months, but may occasionally persist for as long as 24 months, or even remain at detectable levels if active virus replication is continuing with chronic hepatitis B infection.

Positive results are automatically forwarded to California public health per regulations. However, this does not absolve the ordering provider from any additional reporting if such is required.
LOINC code 5185-4
Last Updated 11/18/2013 11:21:55 AM
Entry Number 478

If you have additional questions regarding this test, please call: 415-353-1667

Search Our Test Menu
UCSF home page UCSF home page About UCSF Search UCSF UCSF Medical Center