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Clinical Laboratory Sciences
Sensitivity & Specificity
Terms in this set (18)
How well repeated measurements of the same relatively stable phenomenom will give the same results, also known as precision. May be measured for one observer or for more than one observer.
How closely a given observation agrees with "the true state of affairs" or the best possible measure of reality
PROPORTION of people who test POSITIVE in a group of people KNOWN to have the disease or condition OR the group of people who are TRUE POSITIVES compared with the total # of people who actually have the disease.
The PROPORTION of people who test NEGATIVE within a group of people known to be WITHOUT a given disease or condition OR the proportion of people who are TRUE NEGATIVES compared with the total # of people without the disease.
How well a given symptom, sign or test result (either negative or positive) predicts the presence or absence of disease.
Positive Predictive Value
PROBABILITY of disease in a pt with a positive (abnormal) test OR the PROPORTION of "true positives" out of the total population tested.
Negative Predictive Value
PROBABILITY of NOT having the condition or disease when the test is NEGATIVE or (normal) OR the PROPORTION of "true negatives" out of the total population tested.
75% of the population tested have tested negative for lyme disease. 10% have tested positive but in reality are negative. The term for the 10% of people would be__________
Several of the patients have undergone testing for PPD. All patients except for one are negative and do not have TB. The test for PPD would be considered to have a high__________
When Specificity is high, a Positive test result rules IN the target disorder. What is the acronym?
When the Sensitivity of a symptom or sign is high a NEGATIVE response rules OUT the target disorder. What is the acronym?
Homan's Test is less accurate than US to determine DVT. This would lead you to question the __________ of the Homan's Test.
If the group of people took a urine test for pregnancy and only 50% out of the actual (pregnant) 95% were found to be pregnant. Then the findings of this test would find that the urine test was found to have a low ________________.
You know that the patient has a diagnosis of the disease. What is the chance that the given test will show that the patient is positive for the disease?
You know that your patient does not have the disease. What is the chance that the given test will show that the patient is negative for the disease?
Mary has been assessed every 3 months for a chronic condition using the same test but by different observers. They all get the same results. This is an example of ___________.
If the sensitivity findings of a test is high, then the specificity of the same test would be ___________.
If the specificity findings of a test is low, then the sensitivity of the same test would be __________.
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