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Related Experiment Video

Updated: May 17, 2026

Dried Blood Spots - Preparing and Processing for Use in Immunoassays and in Molecular Techniques
11:28

Dried Blood Spots - Preparing and Processing for Use in Immunoassays and in Molecular Techniques

Published on: March 13, 2015

Hook's effect - a rare presentation in HBsAg screening.

Kafil Akhtar1, Rana K Sherwani, Lateef Ahmad Sofi

  • 1Department of Pathology, Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, India.

Indian Journal of Hematology & Blood Transfusion : an Official Journal of Indian Society of Hematology and Blood Transfusion
|October 27, 2012
PubMed
Summary
This summary is machine-generated.

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Hook's effect can cause false negatives in Hepatitis B surface antigen (HBsAg) immunoassay screening. Diluting samples revealed the true positive result, highlighting the need for accurate blood screening to protect public health.

Area of Science:

  • Clinical Chemistry
  • Immunology
  • Virology

Background:

  • Hepatitis B surface antigen (HBsAg) immunoassay screening is crucial for blood safety.
  • Hook's effect can lead to false-negative results in HBsAg detection.
  • Accurate immunoassay performance is vital to prevent transfusion-transmitted infections.

Purpose of the Study:

  • To investigate the detection of Hook's effect in HBsAg immunoassay.
  • To demonstrate how Hook's effect can cause false-negative screening results.
  • To emphasize the importance of reliable HBsAg detection methods.

Main Methods:

  • A Hepacard device was used for HBsAg immunoassay screening.
  • Donor serum was tested directly and after serial dilutions (1:10, 1:20) in normal saline.
Keywords:
HBs AgHepacardHook’s effect

Related Experiment Videos

Last Updated: May 17, 2026

Dried Blood Spots - Preparing and Processing for Use in Immunoassays and in Molecular Techniques
11:28

Dried Blood Spots - Preparing and Processing for Use in Immunoassays and in Molecular Techniques

Published on: March 13, 2015

  • Assay results were observed after a 20-minute reaction time.

    • Main Results:

    • Direct testing of the donor sample resulted in a false-negative (only a test line, no control line).
    • Serial dilutions (1:10 and 1:20) of the sample produced visible control and test lines.
    • The intensity of the test line increased with sample dilution, indicating the presence of HBsAg.

    Conclusions:

    • Hook's effect can manifest as false-negative results in HBsAg screening assays.
    • Sample dilution is an effective method to overcome Hook's effect and reveal true positives.
    • Minimizing erroneous immunoassay results is essential for safeguarding patient health and blood supply integrity.