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Doctor insights on: False Negative Lupus

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Can ANA test be false negative for lupus?

Can ANA test be false negative for lupus?

Lupus: Has specific criteria for diagnosis, ANA is just one of them and canot be relied on by itself for a diagnosis. ...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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Are false positive herpes test likely?

Are false positive herpes test likely?

No: A positive antibody means you're infected with herpes. That doesn't mean you're developing outrbreaks, but it does mean that you at least have latent herpes somewhere in your body. A positive culture or pcr for herpes means you have an active lesion. ...Read more

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False positive stress test reason?

False positive stress test reason?

Body habitus: Most common cause of false positive stress test is body habitus. This commonly affects women because the heart rhythm needs to be picked up through their breast tissue. ...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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Are false positive HIV tests rare?

Are false positive HIV tests rare?

HIV testing: This depends upon the test employed. They are generally both sensitive and specific but false positive results do occur. This question can be overcome with further testing, the most specific being PCR for HIV RNA. You should be seen by an expert in the management of HIV disease. ...Read more

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What causes false positive HCV antibody test results?

What causes false positive HCV antibody test results?

Misinformed?: Who told you that your hep c test was false? If you have no viral load that means you cleared an infection. Are you sure you are getting the right advice? ...Read more

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Positive ana positive rnp low positive ccp positive dsdna can you tell me if this means lupus or mctd?

?: depends on the clinical picture as well, results point towards auto immune disorder, but need to be put in clinical context and follow up to commit to a diagnosis ...Read more

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Incidence of false false positive PPD in lupus patients?

Incidence of false false positive PPD in lupus patients?

Zero: Lupus does not cause falsely positive ppds. If the PPD is positive, have a quantiferon gold test for tb. This is more accurate. ...Read more

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Would having rheumatoid arthritis cause a false positive ELISA HIV test?

Would having rheumatoid arthritis cause a false positive ELISA HIV test?

Unlikely: Depending on the type of test the lab does having. Positive rheumatiod factor would not cause a positive HIV test . It is best to discuss with your physician. ...Read more

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Av test positive .Ra factor positive .Joint pain .Ccp antibody test negative.Raised esr.Plz diagnose my disease.

Av test positive .Ra factor positive .Joint pain .Ccp antibody test negative.Raised esr.Plz diagnose my disease.

Cannot diagnose: Although these lab values are interesting, taken out of the context of your symptoms and findings on physical examination, plus further testing there is no way in which to diagnose over the internet. See a rheumatologist and get appropriately assessed. ...Read more

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2009- ELISA HIV test- positive, western blot- neg. 2010-oraquick negative. 2014- elisa-indeterminate wb- neg. Low risk for hiv. Could I have lupus?

Not a test for lupus: The HIV test is not a test for lupus. What's clear is that you don't have hiv. You'll never know why your elisa was positive and then indeterminate, and it's not worth investigating. False positive elisas are not uncommon; that's why they have to be confirmed with western blot. ...Read more

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What does this mean ? SSB(La)IGG Positive 85 SSA(Ro)AB IGG Neg. ANA NEG. SED RATE Neg. CRP Neg. RF NEG.

Depends: All lab results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that antibodies to SSA suggest auto-immune disorder, however, if that is the only abnormal test and you do not have any symptoms, I would leave it alone and re-evaluate in six months. ...Read more

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Tetrahydrocanabinol what causes for false negative and false positive?

Tetrahydrocanabinol what causes for false negative and false positive?

Great question: I think dilute urine is the most likely source for false negatives. I am not familiar with other substances outside of the cannabinoid class of compounds (some of the newer synthetics?) that will react with standard immunoassays. If one is concerned, however, about a false positive there is confirmatory testing that can determine for sure whether it was a false positive or not. ...Read more

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ANA positive SSA SSB weekly positive SCL weekly positive RNP SM weekly positive. Any implications? What are the differential diagnosis? WaDoes it mean

ANA positive SSA SSB weekly positive SCL weekly positive RNP SM weekly positive. Any implications? What are the differential diagnosis? WaDoes it mean

Pos auto ab tests: You are describing positive tests for auto antibodies. The differential diagnosis can be extensive. I am assuming a rheumatologist has ordered these tests? You need f/u with them to educate you what they mean, what further tests may need to be done and review your symptoms. Proper rheum DX is not based only on test results, but exam findings and symptoms of patient. Good luck. ...Read more

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What can cause false positive ELISA HIV tests?

What can cause false positive ELISA HIV tests?

Unknown: There is not any real or valid answer to this. It is unknown. The only known reason would be previous participation in a specific HIV vaccine trial where some form of antibody response. But in one who have not so participated the answer is unknowable. ...Read more