false negative


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false neg·a·tive

(fawls neg'ă-tiv),
1. A test result that erroneously excludes someone from a specific diagnostic or reference group.
2. A patient whose test results exclude that person from a particular diagnostic group to which the person ought truly belong.
3. Term commonly used to denote a false-negative result.

false negative

n.
A test result that is false-negative.

false negative

an incorrect result of a diagnostic test or procedure that falsely indicates the absence of a finding, condition, or disease. The rate of occurrence of false-negative results varies with the diagnostic accuracy and specificity of the test or procedure. As the accuracy and specificity of a test increase, the rate of false-negatives decreases. Certain tests are known to yield false negative results at a certain rate; in all tests a small number will occur by chance alone. False-negative results are more common than false-positive results, because the person conducting the test is more likely to fail to observe a finding than to imagine seeing something that does not exist. Compare false positive.

false negative

A term of art referring to a person with a negative test result, who actually has a target condition.

false negative

Diagnostic medicine A test result–eg, Pap smear, mammography, from a Pt who has a particular disease, which is negative or does not detect the presence of an analyte that is usually abnormal in the disease of interest. See Four-cell diagnostic matrix, Cf False positive NIHspeak An active substance or result incorrectly identified as negative by an assay or test.

false neg·a·tive

(fawls neg'ă-tiv)
1. A test result that erroneously excludes a person from a specific diagnostic or reference group.
2. A person excluded by erroneous test results from a particular diagnostic group.
3. A false-negative test result.

False negative

Test results showing no problem when one exists.
Mentioned in: Stress Test

false negative

; FN inaccurate investigative or diagnostic test response, giving a 'no' response where the correct response should be 'yes', so that potentially pathological conditions are missed (see false positive)

false neg·a·tive

(fawls neg'ă-tiv)
1. A test result that erroneously excludes someone from a specific diagnostic or reference group.
2. A patient whose test results exclude that person from a particular diagnostic group to which the person ought truly belong.
3. Term commonly used to denote a false-negative reaction (q.v.).

false

said of diseases or plants that have a superficial resemblance to another plant or disease.

false acacia
false blackleg
cellulitis and myositis caused by Clostridium septicum and C. novyi. More commonly called malignant edema. Characterized by high fever, severe toxemia and local swelling around a wound with subsequent local gangrene and a high mortality rate.
false blusher
see amanitapantherina—a mushroom.
false buckbush
see gyrostemonaustralasicus.
false bursa
see hygroma.
false castor oil plant
daturastramonium, D. ferox.
false columnaris disease
similar to columnaris disease but caused by infection with the bacteria Cytophaga johnsonae. Characterized by skin erosion especially at the fins and jaws.
false distemper
a disease of horses with some similarity to strangles. See pectoral abscess.
false garlic
alliumvineale.
false gid
see oestrusovis.
false hellebore
veratrumcalifornicum, V. viride.
false indigo
false joint
a fracture in a long bone that does not heal; the ends callus over and there is mobility at the point.
false layer
a hen with all the appearances and the behavior of a laying hen but which does not lay any eggs. There is a defect in ovum entrapment and the eggs are discharged into the peritoneal cavity although egg peritonitis is not apparent.
false lupine
thermopsismontana, T. rhombifolia.
false negative
when the result of a test in a patient is negative when the disease or condition which is the subject of the search is present.
false positive
false quarter
a condition of the horse's hoof in which a serious injury to the coronet causes an overgrowth of horn which overlaps the normal wall.
false scorpions
members of the order Pseudoscorpiones. Nonvenomous arachnids called also book scorpions.
References in periodicals archive ?
Octava Pink is designed to reduce women's concerns about missed cancers, while also enabling many of those with false negative results to seek follow-up care and when indicated earlier cancer treatment.
In the parole setting, if one can accept ten false positives for every false negative, false negatives are ten times more costly than false positives; one false negative counts the same as ten false positives.
The DoH said only a small number of women would probably have been affected by a false negative result.
For hazards with severe consequences, we will want to focus on the chances of a false negative occurring (i.
While on the surface of it, this false negative rate seems alarmingly high, yearly Pap smears should ensure that a timely diagnosis can still be made, given the slow progression of most cervical cancers.
A highly sensitive test, therefore, gives more false positives, while a highly specific test gives more false negatives.
If the methodological problems associated with valid assessment of suicidal risk can be overcome, then the occurrence of false negatives will be significantly diminished.
The Millennium Laboratories results support other documentation that in chronic pain patients false negative results are common when immunoassay screening methods are used and reiterate that the drug class descriptors used for many immunoassays are inaccurate.
I am not aware of a systematic effort to describe the false negative rate in the U.
Clinically, our research has shown that this assay can virtually eliminate errors, in terms of false negative or false positive results, commonly associated with current testing methods.
Women taking hormone therapy also appeared to be more likely to get a false negative reading - a failure to detect cancer where tumors existed - than women who did not take estrogen, according to the study.