Category
SEROLOGY/ IMMUNOLOGY
Sub Category
INFECTIOUS.
Synonyms/Aliases
HBV SURFACE ANTIGEN, RDT; HBV SURFACE ANTIGEN, RAPID TEST.
Abbreviations
HBsAg.
Type
INDIVIDUAL TEST.
2-4 HRS
2-4 HOURS
Method
IMMUNOCHROMATOGRAPHY.
Temp
AMBIENT (8 HOURS), REFRIGERATED (7 DAYS), FROZEN (14 DAYS).
Setup
ALL WORKING DAYS.
Components Parameters
N/A
PRE-ANALYTIC CONSIDERATIONS
Test Ordering Instructions
FILL OUT TEST REQUEST FORM FULLY & LEGIBLY.
Patient preparation
N/A
Sample type
SERUM.
Container/ preservative
SERUM SEPARATOR TUBE (SST/ GEL) OR PLAIN (RED TOP) VACUTAINER.
Sample volume
2 ML.
Rejection criteria
LABELING ISSUE (UNLABELED/ MISLABELED); MISSING REQUEST FORM; MISMATCH BETWEEN REQUEST FORM & SAMPLE DETAILS; MISSING AGE/ GENDER; WRONG SAMPLE TYPE; INSUFFICIENT SAMPLE; HEMOLYZED, LIPEMIC, ICTERIC SAMPLES.
Other Instructions
CENTRIFUGE SST (SERUM GEL TUBES) WITHIN 1-2 HOURS OF COLLECTION. CENTRIFUGE RED TOP VACUTAINERS AND ALIQUOT SERUM WITHIN 1-2 HOURS OF COLLECTION. THE SEPARATION VIAL MUST BE LABELED WITH AT LEAST 2 PATIENT IDENTIFIERS AND THE SAMPLE TYPE.
Reference intervals
NEGATIVE.
Clinical Utility
HBsAg IS THE FIRST SEROLOGIC MARKER THAT CAN BE DETECTED AFTER INFECTION WITH HEPATITIS B VIRUS (HBV). IT IS USED TO DIAGNOSE ACUTE OR CHRONIC HBV INFECTION. CHRONIC HBV INFECTION IS DEFINED BY PERSISTENT HBsAg SEROPOSITIVITY FOR ≥6 MONTHS & CAN PROGRESS TO LIVER CIRRHOSIS & HEPATOCELLULAR CARCINOMA.
Test Limitations/ Confounders
FALSE POSITIVES MAY OCCUR IN CASES OF RECENT HBV VACCINATION THEREFORE TESTING SHOULD BE DONE BEFORE VACCINATION.