Epi
Test Sensitivity
search
Test Sensitivity
, False Negative Rate, Test Recall, Diagnostic Sensitivity, False Negative
See Also
Screening Test
Contingency Grid
or
Cross Tab
(includes
Statistics Example
)
Bayes Theorem
(
Bayesian Statistics
)
Fagan Nomogram
Experimental Error
(
Experimental Bias
)
Lead-Time Bias
Length Bias
Selection Bias
(
Screening Bias
)
Likelihood Ratio
(
Positive Likelihood Ratio
,
Negative Likelihood Ratio
)
Number Needed to Screen
(
Number Needed to Treat
,
Absolute Risk Reduction
,
Relative Risk Reduction
)
Negative Predictive Value
Positive Predictive Value
Pre-Test Odds
or
Post-Test Odds
Receiver Operating Characteristic
Test Specificity
(
False Positive Rate
)
U.S. Preventive Services Task Force Recommendations
Definitions
Test Sensitivity
Screening Test
's ability to identify true disease
A Test with high sensitivity has few False Negatives
Independent of disease
Prevalence
in the community
Sensitive Tests allow user to RULE OUT a condition (mnemonic "SNout")
Recall
Identical to the Test Sensitivity, but Recall term is used more in data science
Reflects what percentage of relevant items are positive (not missed as False Negatives)
See
Test Precision
(
Positive Predictive Value
)
Calculation
Test Sensitivity
True positive tests per total affected patients tested
Test Sensitivity = P(positive test | disease)
Where P (A | B) = Probability of A given B
Expressed as a percentage
False Negative Rate
True cases missed by the
Screening Test
(test negative despite presence of condition)
False Negative Rate = 1 - Test Sensitivity
Example
A new
Screening Test
for
Crohn's Disease
Patients with known
Crohn's Disease
tested: 45
Patients with known
Crohn's Disease
who have a positive test: 36
Sensitivity = 36/45 or 80%
References
Hennekens (1987) Epidemiology Medicine, p.327-47
Gates (2001) Am Fam Physician 63(3):513-22 [PubMed]
MacLean (1996) Med Clin North Am 80(1):1-14 [PubMed]
Nielsen (1999) Med Clin North Am 83(6):1323-37 [PubMed]
Type your search phrase here