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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
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
Yes, but not common: Yes, just about any study can have false positives, however it is not common with a hida scan. Things which can interfere with the study and cause a false positive include, prolonged fasting(more than 24hrs), very poor liver function, non-fasting state (less than 4hrs), prior surgery to remove the gallbladder, pancreatitis, TPN (total parenteral nutrition). ...Read moreSee 3 more doctor answers
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
No such thing: If the alt is elevated, something's caused the enzyme to leak from your liver and/or skeletal muscles. Today's assays are reliable. But this does not necessarily means you are sick. It can be from the ultramarathon you just ran, or the Ibuprofen you took for the cold you're now better from. Your physician knows how to follow this up -- often just a repeat draw will lay concerns to rest. ...Read more
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