Widal (Slide Method) Report Format
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What is the Widal Test?
The Widal test is a diagnostic test used to detect the presence of antibodies (agglutinins) against Salmonella species, particularly Salmonella typhi, which causes typhoid fever. The slide method is a rapid qualitative test that detects agglutination of the antigen-antibody reaction.
What is a Widal (Slide Method) Report Format?
A Widal (Slide Method) report presents the result of the slide agglutination test, indicating the presence or absence of Salmonella antibodies in the patient’s serum. It is used to screen for acute typhoid fever and monitor the presence of antibodies.
Tests Included in Widal Report
Test | Description |
Widal (Slide) | Detects agglutination of specific Salmonella antigens (O, H) in the patient’s serum. |
Key Parts of a Widal Report
Key Part | Description |
Sample Type | Serum (blood sample). |
Test Method | Slide agglutination method with antigen suspension. |
Result | Reported as Positive, Negative, or Indeterminate. |
Interpretation | Provides clinical context based on agglutination pattern. |
Reference Range for Widal Report (Slide Method)
Antigen | Titer Level (1:20) |
O Antigen (Somatic) | Non-Reactive (no agglutination) |
H Antigen (Flagellar) | Non-Reactive (no agglutination) |
Parameters to Consider in Widal Report (Slide Method)
Parameter | Interpretation |
Positive Result | Suggests recent or active Salmonella infection, typically typhoid fever. |
Negative Result | No antibodies detected—likely no current or past infection. |
Indeterminate Result | Weak agglutination observed—requires follow-up testing or confirmation with a higher dilution. |
Agglutination Pattern | Agglutination in one or more antigens indicates specific antibody presence. |
Guidelines for Widal (Slide Method) Report Format
Guideline | Description |
Sensitivity | The slide test is semi-quantitative; titer level interpretation is less precise than tube agglutination. |
Timing of Test | Best used within the first 7 days of fever onset; later tests may show positive results from past infections. |
Follow-Up | Positive slide results should be confirmed with a tube agglutination test (standard Widal test) and clinical correlation. |
What Do the Results Mean?
Result Type | Interpretation |
Negative | No detectable antibodies to Salmonella—no evidence of typhoid fever or past infection. |
Positive | Suggests active infection, likely Salmonella typhi—confirm with further tests such as blood culture. |
Indeterminate | Weak or borderline agglutination—requires further testing, including titers or blood culture. |
Widal (Slide Method) Report Interpretation
Test | Interpretation |
Widal (Slide) | A rapid screening test for Salmonella infection; positive results indicate possible typhoid fever but require confirmatory testing with blood culture or further Widal testing (tube method). |
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