In a screening test for Chlamydia, the sensitivity is 83% and specificity is 50%. A total of 800 subjects were screened, of whom 90 actually had Chlamydia (confirmed through follow-up testing). Calculate and interpret the Positive and Negative predictive values.
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In a screening test for Chlamydia, the sensitivity is 83% and specificity is 50%. A total of 800 subjects were screened, of whom 90 actually had Chlamydia (confirmed through follow-up testing). Calculate and interpret the Positive and Negative predictive values.
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- A DVT (deep vein thrombosis) clinic had 320 persons appearing for lower extremities Doppler ultrasound study. If 48 out of 80 subjects with DVT tested positive for the DVT, and 228 out of 240 without DVT tested negative Calculate the following Sensitivity Specificity False positive False negative Positive predictive value (PPV) What does this PPV mean Negative predictive value (NPV) What does this NPV here mean The prevalence of DVT What is the 2 x 2 contingency table What is the difference between prevalence with regard to PPV and NPV?Create an illustrated step-by-step schematic diagram of the following Qualitative test for Baudouin Test Huble's TestA DVT (deep vein thrombosis) clinic had 320 persons appearing for lower extremities Doppler ultrasound study. If 48 out of 80 subjects with DVT tested positive for the DVT, and 228 out of 240 without DVT tested negative Calculate the following False negative Positive predictive value (PPV) What does this PPV mean Negative predictive value (NPV)
- A DVT (deep vein thrombosis) clinic had 320 persons appearing for lower extremities Doppler ultrasound study. If 48 out of 80 subjects with DVT tested positive for the DVT, and 228 out of 240 without DVT tested negative Calculate the following What does this NPV here mean The prevalence of DVT What is the 2 x 2 contingency table What is the difference between prevalence with regard to PPV and NPV?Differentiate bilirubin detection in the urine using reagent strip testing with the following tests in terms of sensitivity and specificity. a. Foams test b. Smith's test c. Harrison's test d. Ictotest TableProvide reasons for false-positive nontreponemal test results.
- Depending on the purpose, the typhoid fever can be diagnosed in the laboratory by either of the following method, i) Widal, ii. Blood culture and iii. Nucleic acid based identification method. Write a brief essay comparing these three diagnostic tests. Your answer must contain the basis of identification of each test, what does it mean by positive and negative results and which test do you think to be useful for the identification of active patient and which test is/are useful for the screening of previously infected case. Which test is prerequisite to perform the antibiotic susceptibility pattern?List some conditions that cause false positive reactions with the RPR test. Short answerWhat are the reasons (give three) why blood samples might be rejected in the pre-analytical phase.