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Doctor insights on: Test Screening

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Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?

Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?

Yes: The initial screening test for HIV is very sensitive, but not very specific. The back up screening tests are much more specific for HIV. ...Read more

Dr. Ana Adelstein
1 doctor shared a insight

Screening (Definition)

Examples are: colonoscopy for colon polyp or cancer; mammograms for breast lesions or cancer; psa a blood test that could indicate enlargement of cancerous prostate tissue; blood sugar or hemoglobin a!c for diabetes. Many think that scanning the whole body will pick up a cancer--in all likelihood, it will not. There also is no good blood test, yet, ...Read more


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What's a urine cannabinoids screening test?

What's  a urine cannabinoids screening test?

Drug test: This is a laboratory test which analyzes the concentration of marijuana products in the urine. Some consider this an invasion of privacy, but some industries require this as a screen for employment. This falls under the political issue of whether these substances are a serious problem or not. ...Read more

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Does urinalysis occult test detect cancer?

Does urinalysis occult test detect cancer?

No: Testing urine for cancer cells as screening of after treatment is not routine. Specific assays are being refined for detection. Finding occult blood or proteins may prompt evaluation but again most often does not lead to cancer diagnosis. ...Read more

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How can I pass reditest/redicup drug test screening device?

How can I pass reditest/redicup drug test screening device?

By not using drugs: Ethical and reputable physicians are not in the business of helping people "beat" drug tests. The sophistication of these tests have reached the point where they are difficult-to-impossible to beat, if the test is done by an experienced center which knows how people try to adulterate/substitute samples. If you have a drug problem, work on getting help rather than on not getting caught. Please!!!! ...Read more

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Positive quantiferon gold test but negative xray?

Positive quantiferon gold test but negative xray?

See below: It means that you have been exposed to tb. A chest x-ray that is positive would indicate either past or active infection. ...Read more

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Is a four week negative HIV antibody test / negative PCR test reliable?

Is a four week negative HIV antibody test / negative PCR test reliable?

HIV diagnosis: Antibody titers have been reported to be delayed as long as six months, but this is very unusual. A negative pcr for viral RNA is virtually determinative of the absence of infection. ...Read more

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Clearblue.Easy.Ovulation test show pregnancy?

Clearblue.Easy.Ovulation test show pregnancy?

No: Home pregnancy tests are used to detect pregnancy and ovulation tests are used to detect ovulation. Take care. ...Read more

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Ana screen, ifa positive a (negative) means?

Ana screen, ifa positive a  (negative)   means?

Nothing by itself: One person in four tests positive. The vast majority of these people have no problems. The clinical picture is key, and how high the titer is may be helpful. ...Read more

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Which screening tests are performed for pregnancy?

Which screening tests are performed for pregnancy?

Beta HCG: If you mean test to diagnose pregnancy, urine and/or blood level of beta chain of human chorionic gonadotrophic hormone are tested. ...Read more

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Mantoux test positive?

Mantoux test positive?

Work up needed: At the very least it may suggest that you have been exposed to tuberculosis. You should visit with your doctor to have questions asked about whether or not you have TB symptoms to suggest infection such as do you have a cough? Unexplained night sweats? Unexplained weight loss, fevers or chills and fatigue? You also need to have a chest x ray performed - since organism is usually inhaled. ...Read more

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Will a standard blood test screen for pregnancy?

Will a standard blood test screen for pregnancy?

No: Standard blood studies do not address that question. A quick urine test for HCG is the easiest way. ...Read more

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Can an HIV antibody screening test be positive but the western blot negative?

Can an HIV antibody screening test be positive but the western blot negative?

Yes: There are 2 reasons for this kind of result: (1) a false positive, or (2) early infection before seroconversion. In someone at low risk for HIV without symptoms, another negative WB in 1 month means there's no infection. In someone at risk or with symptoms of acute infection, a viral load can be helpful. The new 4th generation antigen/antibody tests will eliminate this problem. ...Read more

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Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?

Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?

False negative PG: A false pregnancy test is possible however, in this case you also have a negative blood pregnancy test which is far more accurate. ...Read more

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Preg test positive but blood test negative missed period?

Preg test positive but blood test negative missed period?

Timing: It is possible that the urine pregnancy test detected HCG that was in the urine even as a pregnancy was failing (impending miscarriage) but by the time a blood test was done, the miscarriage had already occurred and the levels of the HCG pregnancy hormone were cleared. Alternatively, it could have just been a false (+) urine pregnancy test. ...Read more

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Are STD urine test accurate?

Are STD urine test accurate?

Yes, reliable ...: Yes, it's reliable but less than testing the specimens from vaginal fluid / cervical mucus/fluid, especially for trichomonas. Besides, some 75% & 50% of chlamydia-infected women & men have no symptom respectively. So, all women ...Read more