Focusing on older L1 family members is likely to increase the rate of false-negative results.

Do not wash before the test, because that may cause a false-negative result.

A false-negative result from a blood test is possible if you have been infected recently.

But the culture often fails to find the virus even when it is present (false-negative results).

But these tests sometimes give false-positive or false-negative results.

Even a small increase in fluorescent efficiency could reduce background noise and lower the rate of false-negative results.

However, regular screening helps to compensate for false-negative results.

Exfoliative cytology has a high number of false-negative results.

Therefore they may be undetected by corresponding diagnostic tests and gave a false-negative result for the infection.

This is called a false-negative result.

Failure to detect T. pallidum does not definitively rule out infection because false-negative results are common.

The rapid strep test can give false-negative results even when strep bacteria are present.

EPTs may be unreliable and lead to false-positive and false-negative results.

This measurement technique is preferred because it has lower rates of false-positive and false-negative results than a spot urine microalbumin.

Despite rumors to the contrary, goldenseal won't cause false-negative results for marijuana, cocaine, amphetamines or numerous other illegal drugs.

This is the hormone analyzed by pregnancy test; a false-negative result from a pregnancy test may be obtained before or after this period.

Approximately one fourth of HIV-infected persons with pulmonary TB disease have false-negative results (301).

Although PET scans look at the metabolic activity of structures, such as lymph nodes, they also have false-positive and false-negative results.

Nevertheless, our high success rate (20/27) leads us to believe that failure to observe expression of a high-scoring, third-species-conserved miRseeker candidate could reflect a false-negative result.

Surface swab cultures may yield false-negative results, perhaps due to viral propensity for infecting endothelial cells and fibroblasts with resulting low levels of free virus.

Cell culture or PCR tests taken from active sores may give a false-negative result if the sores have begun healing.

Real-time PCR using Taq-man chemistry is prone to false-negative results when the virus mutates.

A tensilon (edrophonium chloride) test can be used, which temporarily blocks the breakdown of acetylcholine, and briefly relieves weakness; however, false-negative results are common.

They may have abnormal results even when there isn't cancer (a false-positive result) or have normal results when a man has cancer (a false-negative result).

A person who receives a false-negative result (one that shows there is no cancer when there really is) may delay seeking medical care even if there are symptoms.