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 ?
In other words, likelihood ratio negative (LR-) is ratio of false negative rate with specificity.
TABLE 1: PAROLE FORECASTING TYPOLOGY Predict Predict Darth Vader Luke Skywalker Darth Vader True Positive False Negative Luke Skywalker False Positive True Negative TABLE 2: FORECASTING SKILL USING 3-TO-1 COST RATIO OF FALSE NEGATIVES TO FALSE POSITIVE Predict Not Predict Percentage Violent Violent Correct Not Violent 7607 1877 80% Violent 561 376 40% TABLE 3: FORECASTING SKILL USING 30-TO-1 COST RATIO OF FALSE NEGATIVES TO FALSE POSITIVE Predict Not Predict Percentage Violent Violent Correct Not Violent 3998 5486 42% Violent 156 781 84%
Our study focused on false negatives by applying the tolidine test on a bloodstain (Castello 1997; Gisbert 1998).
False negative Pap smears are a frequent cause of lawsuits, based both on real laboratory error, but also on the misperception that Pap smear screening is an exact science and that any false negative test may be the result of negligence.
In rate terms, that means there is a false negative rate of 68.
Thus, if a Western blot comes up negative and the new test comes up positive, it can be difficult to know whether the former is a false negative or the latter a false positive.
On the basis of the descriptions in the MAUDE report, false negatives were subdivided by potential cause unknown, likely hCG[beta]cf hook effect, and likely limit of detection.
One of the headaches caused by spam-fighting programs is false negatives that fail to block spare and false positives, where the software labels a legitimate e-mail as advertising.
These quality checks resulted in an unexpectedly high rate of false negatives.
PCR resulted in 35 false positives and no false negatives, for a sensitivity of 100% and a specificity of 88%.
The false negatives and the vague presentation together were associated with a high score for infiltrating margins at histologic review.
He added that the possibility was "remote" that anybody had a false-negative result and that the company had not received any reports of false negatives.