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wk11 Test Validation and statistics
Fichas del conjunto (31)
- 1to assure that a lab/sonographer is providing correct information by comparing non-invasive test results to a reference that is considered the gold standardquality assurance
- 25 measurements of comparisonsensitivity
specificity
positive predictive value
negative predictive value
accuracy - 3both the non-invasive and the gold standard found disease (or had an abnormal result)True positive (TP)
- 4both agree that the test is positiveTrue positive
- 5the non-invasive result was abnormal, but the gold standard was normalfalse positive (FP)
(the non-invasive test is falsely positive) - 6disagree on the resultfalse positive
false negative - 7the non-invasive exam was normal, but the gold standard found diseasefalse negative (FN)
the non-invasive exam was falsely negative - 8the non-invasive and the gold standard agree on the absence of diseasetrue negative (TN)
- 9both agree that the test is negativetrue negative
- 10the ability of a test to detect disease (truly positive)sensitivity
- 11how to calculate sensitivityTP / (TP+FN)
A / (A+C) - 12the ability of a test to identify normality (truly negative)Specificity
- 13how to calculate specificityTN / (TN+FP)
- 14the percentage of non-invasive tests which accurately predict abnormalityPositive predictive value
- 15how to calculate positive predictive valueTP/ (TP+FP)
- 16the number of non-invasive tests which accurately predict normalityNegative predictive value
- 17of your positive non-invasive exams, what percentage correctly predicted the disease as confirmed by the gold standardpositive predictive value
- 18of your negative non-invasive exams, what percentage accurately predict the absence of disease as confirmed by the gold standardnegative predictive value
- 19how to calculate negative predictive valueTN / (TN+FN)
- 20the overall percentage of correct non-invasive diagnosesAccuracy
- 21how to calculate accuracy(TP+TN) / (TP+FP+TN+FN)
total correct / total exams - 22the value for accuracy will fall between those for ___ and ___ and between the positive and negative predictive valuessensitivity and specificity
- 23comparing the non-invasive results and the gold standard resultsstatistical correlation
- 24the 2x2 box configuration that allows you to calculate the statistics is called theChi square
- 25Chi squarettt
- 26what is the G in front of the positive and negative predictive valuesstands for "group"
GPPV or GNPV - 27the main accrediting body for vascular labs isICAVL (IAC)
- 28lab accreditation non-profit organizationintersocietal commission for the accreditation of vascular laboratories
- 29participation in accreditation process isvoluntary
- 30ICAVL offers accreditation in the following areasextracranial cerebrovascular
intracranial cerebrovascular
peripheral arterial
peripheral venous
visceral vascular - 31cardiac accreditationICAEL
intersocietal commission for the accreditation of echocardiography laboratories
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- vascular sonography 2 Fichas sobre wk11 Test Validation and statistics , creado por Abbey Evans el 27/10/2019.
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- Abbey Evans
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