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Doctor insights on: Anthrax Test

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Tuberculosis vaccinated, TB test positive...Will my ANA be positive because of TB test positive due to vaccine?

Tuberculosis vaccinated, TB test positive...Will my ANA be positive because of TB test positive due to vaccine?

No: There is no cross reaction between them. By the way, up to 5% of normal individuals may test positive to ANA test, usually at low titer. ...Read more

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When the hiv test is conclusive?.what causes repeated perianal fungal infection?last hiv test 14monthes postexposure.is negative?

When the hiv test is conclusive?.what causes repeated perianal fungal infection?last hiv test 14monthes postexposure.is negative?

No worries: Every HIV test that exists, anywhere in the world, is conclusive by 3 months. The most commonly used tests are conclusive by 4-8 weeks. For sure your negative result at 14 months proves you don't have HIV, no matter how high risk the exposure (and if not reexposed), and no matter how typical the symptoms. Entirely healthy people often get perianal fungal infections; it's not a sign of HIV. ...Read more

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Tb skin test negative, quentform TB test negative, bone marrow biopsy results indicative of TB (reacts to ziehl niehlssen), PCR negative. How come?

Tb skin test negative, quentform TB test negative, bone marrow biopsy results indicative of TB (reacts to ziehl niehlssen), PCR negative. How come?

No...actually: The zn stain is a broad stain for acid fast bacilli of which mycobacterium tuberculosis is one of many. The specific tests like quantiferon or the pcr test are against you having tb. The culture is the "gold standard" but you will need to wait for it. It might turn out be a cousin of TB and that too will grow out of culture. Stay on TB meds until they are certain of the AFB positive organism. ...Read more

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Hiv test in 70 days conclusive?

Hiv test in 70 days conclusive?

Depends on the test : And results. Any of the tests for HIV nucleic acid, HIV antigen or HIV antibody, if positive, is conclusive of HIV infection. Negative test for HIV nucleic acid would essentially rule out HIV infection. A negative test for antigen and antibody will not rule out HIV infection. ...Read more

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Hiv 7months ELISA test negative 100% accurate?

Hiv 7months ELISA test negative 100%  accurate?

No: If positive, it will be followed up with a confirmatory test. If negative, you are almost certainly okay but if you are very worried you might be able to pay for a pcr assay, which is the gold standard. ...Read more

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Tested false positive ELISA HIV test last month. Negative ifa and western blot and naat. 2 negative oraquick all 1 1/2 year post exposure. Hiv?

Tested false positive ELISA HIV test last month. Negative ifa and western blot and naat. 2 negative oraquick all 1 1/2 year post exposure. Hiv?

Negative: If nat was negative at 6 months after exposure you not likely to have hiv. Given all the negative test results, you should not worry about the one apparently false positive. ...Read more

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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

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Is Hiv p24 test conclusive at 3 months?

Yes, but...: ...you should also have an HIV antibody test. The combination of negative p24 plus negative antibody is conclusive any time 4 weeks or more after the last exposure. Don't keep having more tests -- waste of money. It is never necessary to test for HIV beyond 3 months. ...Read more

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Is the lloyds pharmacy home HIV blood test accurate?

Is the lloyds pharmacy home HIV blood test accurate?

Unsure: There are only a couple of fda approved home HIV test kits. Lloyds may just be distributing a test for another company. You should go on-line and specifically see if an fda approval has been issued for the name of the manufacturer. Make sure you test exactly as stated, no exceptions. Follow instructions explicitly for the results to be meaningful. ...Read more

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Does 3 Hiv negative test confirms your HIV negative?

Need details: A single nucleic acid test after the interval during which this becomes positive is proof enough that you are not infected. You're young. I trust you'll play safe from now on, and if you continue to have obsessive thoughts that you have become infected, sit down with your physician or someone who's trained in helping you get back into control of these unwanted and unhelpful thoughts. ...Read more

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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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How accurate is 3 week ELISA blood tests on hiv? Elisa test is the newest HIV detection test?

Very accurate: The elisa assay is one of the longest standing tests for antibodies to hiv. Positive results must be confirmed using western blot or other tests. If negative at 3 wks you should be retested at 3 and 6 months to be absolutely certain, but those latter tests are rarely positive if the 3 wk test was negative. Be safe. Have only protected sex until both partners assuredly negative, and monogamous. ...Read more

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What percentage test false-positive for tb?

What percentage test false-positive for tb?

TB skin test isn't: Perfect test.A false-positive test may happen if you've been vaccinated with the bacillus calmette-guerin (bcg) vaccine. This tuberculosis vaccine is seldom used in the United States but is widely used in countries with high TB infection rates. ...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