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Is a Western blot valid after 16 weeks of exposure?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hi doctor,

I am 26-years-old. Doctor has recommended western blot for HIV 1 and 2 as a screening test. I obtained a negative western blot (RIBA) for HIV 1 and 2. I also had a negative CMIA test at 12 weeks post exposure.

My questions are:

1) Is a negative western blot 100% accurate and reliable at 16 weeks post exposure?

2) If western blot is so accurate, why is it not used as a screening test ?

3) Is a six month retest required despite a negative WB at 16 weeks?

4) Will active CMV increase the window period?

Thank you.
Answered by Dr. Ravinder K. Sachdeva

Education:

MBBS

Professional Bio:

Dr. Ravinder K. Manchanda is an HIV and AIDS Specialist dedicated to providing compassionate and comprehensive care. She emphasizes building strong doctor-patient relationships, encouraging open discussions to ensure comfort and trust. With a patient-centered approach, she focuses on individualized treatment plans, improving health outcomes, and enhancing overall satisfaction with care. Her commitment lies in guiding patients through primary HIV management with empathy and expertise.

This doctor is not available for online consultations on the platform anymore.

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Hi,

Welcome to icliniq.com.

I read your query and understand your concern.

The answers to your queries are:

  1. Western blot test at 16 weeks is extremely accurate. However, as antibodies might take variable time to develop, therefore the tests are recommended at repeat intervals.

  1. These days HIV rapid tests give nearly the same accuracy as western blot, these are used as screening strategies as results are given in a few minutes and also cost effective as tests need to be repeated.

  1. Get your eye examination done.

  1. Active CMV seen in advanced HIV disease, is it documented anywhere. You need to relax. Your western blot is negative.

Hope your query has been answered, if you still have some, please revert.

Thank you for consulting me.

You can always come back and reach me at icliniq.com.

Medically reviewed by Dr. K. Shobana
Published At August 24, 2023
Reviewed At December 18, 2025

Education:

MBBS

Professional Bio:

Dr. Ravinder K. Manchanda is an HIV and AIDS Specialist dedicated to providing compassionate and comprehensive care. She emphasizes building strong doctor-patient relationships, encouraging open discussions to ensure comfort and trust. With a patient-centered approach, she focuses on individualized treatment plans, improving health outcomes, and enhancing overall satisfaction with care. Her commitment lies in guiding patients through primary HIV management with empathy and expertise.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality

Education:

BDS

Professional Bio:

Dr. K. Shobana is a Dental Surgeon specializing in oral health and dental care. She is skilled in preventive dentistry and provides oral hygiene education. She can do restorative treatments such as fillings and crowns. She can handle periodontal problems such as gum diseases and periodontitis. She can do root canal treatment.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Ravinder K. Sachdeva
Dr. Ravinder K. Sachdeva

HIV/AIDS specialist

Education:

MBBS

Professional Bio:

Dr. Ravinder K. Manchanda is an HIV and AIDS Specialist dedicated to providing compassionate and comprehensive care. She emphasizes building strong doctor-patient relationships, encouraging open discussions to ensure comfort and trust. With a patient-centered approach, she focuses on individualized treatment plans, improving health outcomes, and enhancing overall satisfaction with care. Her commitment lies in guiding patients through primary HIV management with empathy and expertise.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality
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