Question 9A 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 negativeCalculate the followingSensitivitySpecificityFalse positiveFalse negativePositive predictive value (PPV)What does this PPV meanNegative predictive value (NPV)What does this NPV here meanThe prevalence of DVTWhat is the 2 x 2 contingency tableWhat is the difference between prevalence with regard to PPV and NPV?

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Answered: A DVT (deep vein thrombosis) clinic…

Phlebotomy Essentials

6th Edition

ISBN:9781451194524

Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Chapter1: Phlebotomy: Past And Present And The Healthcare Setting

Section: Chapter Questions

Problem 1SRQ

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Question 9

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?

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