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Hi Today I Have Taken Widal Test My To Is

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Posted on Sun, 25 Nov 2018
Question: hi today i have taken widal test my to is 1/160 and th is 1/80 what does it mean
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Answered by Dr. Michelle Gibson James (43 minutes later)
Brief Answer:
would be considered positive

Detailed Answer:
HI, thanks for using healthcare magic

The widal test is used to check for salmonella typhi.

It's accuracy can vary. H and O refer to antigens or types of proteins that can be found on the bacteria. The widal test looks to see if the body has made antibodies (another type of protein to fight infection), to try and fight the bacteria. If a person does not have salmonella or has a very very small amount then the body would not make a lot of antibodies/fighting protein.


A false positive test (person got a positive result and does not have an infection at the moment), can occur if a person had the infection before or was vaccinated.

It is said to be positive if the result is more than 1:80 or if there is 4 fold/4 times increase between blood test results. Some labs may state O greater than 1:80 and H greater than 1:160- would be positive

If a person lives in a country or region where there is a high prevalence/number of people with typhoid fever then diagnosis requires higher values

Based on your results, the result would be said to be positive

I hope this helps, feel free to ask any other questions
Note: For further follow up on related General & Family Physician Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Michelle Gibson James

General & Family Physician

Practicing since :2001

Answered : 16808 Questions

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Hi Today I Have Taken Widal Test My To Is

Brief Answer: would be considered positive Detailed Answer: HI, thanks for using healthcare magic The widal test is used to check for salmonella typhi. It's accuracy can vary. H and O refer to antigens or types of proteins that can be found on the bacteria. The widal test looks to see if the body has made antibodies (another type of protein to fight infection), to try and fight the bacteria. If a person does not have salmonella or has a very very small amount then the body would not make a lot of antibodies/fighting protein. A false positive test (person got a positive result and does not have an infection at the moment), can occur if a person had the infection before or was vaccinated. It is said to be positive if the result is more than 1:80 or if there is 4 fold/4 times increase between blood test results. Some labs may state O greater than 1:80 and H greater than 1:160- would be positive If a person lives in a country or region where there is a high prevalence/number of people with typhoid fever then diagnosis requires higher values Based on your results, the result would be said to be positive I hope this helps, feel free to ask any other questions