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  #1  
Old 08-09-2013
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Default Pharyngitis!

A 3-year-old boy is brought to the clinic by his
mother. She is concerned because the patient
has complained of a sore throat over the past 4
days. He is not in day care and has had no
known sick contacts. His 7-year-old sister is
currently healthy. The physician does a throat
swab for a rapid streptococcal test and sends a second specimen for culture. Why does the
physician perform both tests?
(A) The culture may grow strains of bacteria
which are not detected by the rapid test
(B) The rapid streptococcal test and culture
both have high sensitivity
(C) The rapid streptococcal test and culture
both have high specificity
(D) The rapid streptococcal test has a high sensitivity, while the culture has high speci-
ficity
(E) The rapid streptococcal test has a high
specificity, while the culture has high sensitivity
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  #2  
Old 08-11-2013
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It s c....
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  #3  
Old 08-11-2013
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Rapid Streptococcal Antigen Test has over 95% specific so if positive it's as good as a positive throat culture. But if negative ho gor throat culture...
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Kruno (01-25-2017)
 
  #4  
Old 08-12-2013
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The sensitivity of a rapid strep test is lower than that of culture right?So the only reason it is done first is that its quick in its results?
This is what I understood---If the rapid strep test is positive,go ahead and give antibiotics and if its negative go for the culture.By the way,what do we do till the results of the culture are out?
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  #5  
Old 08-12-2013
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I think the correct answer is D.
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  #6  
Old 08-13-2013
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Yeah its supposedly D....care to explain?
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  #7  
Old 01-25-2017
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The correct answer is E.

If the rapid antigen detection test is positive, antibiotics can be prescribed without the need for a culture.
NOTE: The rapid antigen detection test has high specificity

If the rapid antigen test is negative, then a culture has to be performed before ruling out streptococcal infection.
NOTE: The culture has high sensitivity.

Last edited by Kruno; 01-31-2017 at 02:38 AM.
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