Doctor insights on:
Is A Negative Rare
Blood type: Consists of blood group a, b, ab or o combined with rh factor positive or negative. Lacking this cell surface marker (rh negative), neg folks cannot take blood products from people who are rh positive, as your body will reject them, followed by blood group. Rh negative folks are not rare in number. They are simply more restricted, based on that neg factor, from whom they can receive. ...Read moreSee 1 more doctor answer
Common: It all depends how hard the physicians look. In one study, 13% of healthy folks had a bit of cryofibrinogen on board. On the other hand, if (as i think your previous questions have suggested) you developed severe symptoms in the cold, or ulcers that were not explained, maybe you're one of the few people for who a cryoprotein of some sort really is a problem. Best wishes. ...Read moreSee 1 more doctor answer
Is a negative HIV test after 2 months of exposure accurate? Is there a chance it might be possitive now?
Less likely: But you should continue to be retested for at least 6 months. Test at 3 and 6 months. Or if you want to be sure immediately you can have an RNA pcr done which will tell you immediately whether there is any infection, but it is $$$$. The overwhelming chances are that if you were tested with latest technology that you are negative. Be careful out there. ...Read moreSee 1 more doctor answer
Is there such thing as a false positive ive heard of a false negative if a test is positive its means pregnant right?
Statistics: There are few, if any, tests that are 100% accurate. We measure accuracy by considering a test sensitive or specific. A highly sensitive test rarely misses a condition (few false negatives). A highly specific test rarely mistakes another condition for the one it's testing (few false positives). Repeating the test, with a different kit, will help raise the accuracy of your finding. ...Read moreSee 1 more doctor answer
No: No laboratory test is perfect. That said, false positive hpv dna test results are very uncommon. Depending upon the type / brand of test used, it is possible that some "low risk" hpv types can be detected by "high risk" probe sets. In this sense, a person may be labeled as being at greater risk for cervical cancer, but the "false positive" is in the type of virus and not the presence of virus. ...Read more
If there is a cross- reactivity during an elisa test is it possible to end up with a false negative as a result?
False positives: Cross-reactivity can cause false positives (meaning that the test is positive but the actual substance tested for isn't there). The happens when an antigen (virus, protein or bacterium) is so similar structurally that it reacts with the same antibody that the test is designed for. For example, the antibody test for latex allergy can sometimes cross react with a protein in bananas! Crazy, huh? ...Read more
Yes.: If the test is done improperly you can get any result. If you were pregnant and had a spontaneous miscarriage it may change. ...Read more
Herpes culture: A positive culture means that the virus was present and actually grew and multiplied in the lab. The only way it would be wrong is if the made some kind of mistake with labeling your specimen and mixing it up with somebody else. That would be very very very rare for a culture. ...Read more
Is it a really high chance a positive test for amphedimine and a week later benzodiazepine be false positives?
Low chance: So there was a positive test for amphetamines, and then a week later for benzodiazepines. You wonder about the chances that both could be false positives. The chances would be quite small. ...Read more
Yes, early infection: It takes a few weeks for the blood tests to become positive, so false neg is common soon after infection. Once infction is established and a few weeks have passed, false negatives are rare. And even in those rare circumstances, the infection usually is not active or likely to be damaging. If outwardly healthy, a neg blood test is virtually 100% assurance against active or transmissible syphilis. ...Read moreSee 1 more doctor answer
Still very unlikely: On average, 0.2% of elisa tests give a false positive result that are later proven incorrect by a confirmatory western blot test. Causes of false positive HIV antibody tests include autoimmune disorders, recent vaccinations, multiple pregnancies. This is because these conditions can stimulate the body's production of antibodies that can cross react with HIV antigens causing false positive result. ...Read more
Is there such a thing where a woman gets a negative preg test but is still pregnant, and then finally gets a positive result much later?
Yes, but once you: ...have missed a period, assuming your cycles are regular, it's unusual. By "much later" I mean only a week or so. The hormone HCG is detectable in blood & urine shortly after the embryo implants in the uterus. If it implants in the Fallopian tube (ectopic pregnancy) or fails to develop properly, a urine pregnancy test may be (-). See your OB if you have pelvic pain, heavy bleeding or other ?'s ...Read more
A positive pregnancy test result followed by a negative result which is more likely false positive or a false negative?
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- How rare is a negative blood?
- Rare gram negative rods
- Is blood group o negative rare?
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- 0 negative blood type rare
- B negative blood type rare
- How rare is a negative blood type?
- How rare is rh negative blood type?
- Rare blood types a negative