Doctor insights on:
Reasons For A False Positive Pet Scan
Pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making ...Read more
If i tested borderline positive on blood test for lung blood clots but negative on VQ Scan is it possible a CT Scan or another test could be positive?
False positive for Lupus, now positive for HCV, waiting on blood test to confirm. Could HCV cause a false + for lupus?
Blood tests negative for celiac, hla gene positive, biopsy positive. Could there be another cause for mucosal flattening?
Unlikely: The blood test is of secondary importance. It depends on what test you had, for instance the immunoglobulin a antibody to tissue transglutaminase may be negative if one already avoids eating gluten. Also, it is not very sensitive. The definitive test is the biopsy (not the gene, which does only show the likelihood of developing the disease. You probably have celiac disease. ...Read moreSee 1 more doctor answer
A lot of products.: A screening drug test is not perfect. A site i would recommend for a list of over the counter medications and the associated false positives is: http://www.Askdocweb.Com/falsepositives.Html. ...Read more
Is it possible to get a false negative for marijuana on a doctors office drug test? At home drug test shows positive
Possible: Any test can give a false positive or false negative result. If you do weed, you know the true state and do not need to test. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex. ...Read moreSee 1 more doctor answer
If urine pregnancy tests were giving false negatives and a pelvic CT scan was performed at a possible 7 weeks pregnant, would the fetus show in scan?
Precautions: The radiology place I am sure would have taken the precaution of finding if you were pregnant before doing the scan and should have used a reliable test. And yes, if you were pregnant, as long as the area of interest shows the pregnancy they should be able to see it and give you advise…but then again, it should not happen. ...Read more
No: There is no evidence to conclude that. ...Read more
See below: False negative & false positive results are testing errors (meaning the test results were wrong). In this case... A "false negative" result means that despite the test being negative, the person actually does have the infection. A "false positive" result means that a positive test result occurred in someone who really did not have the infection. ...Read moreSee 1 more doctor answer
No risk factors for TB. 9 weeks pregnant, had QFT blood test for TB. Results came back positive. Can this test show false positive? What's next?Scared
False positive test: Yes you can have what is called a "false positive test." This means that at one point you where exposed to TB, you where in close contact with someone. The usual next step is to have a chest X-Ray to see if you have TB in your lungs. A false positive test is quite common and nothing need to be done. Please follow up with your doctor. ...Read moreSee 2 more doctor answers
False negatives: All lab tests have a certain percentages of false negatives and positives. ...Read more
What could cause recurrent flank pain if CT scan is negative for stones and urine test is negative for infection. Dip was positive for blood?
?Hypercalcuria: Negative ct scan has almost definitely ruled kidney tumor, stones or obstruction. Combination of flank pain and blood in the urine could be indicative of hypercalcuria. Xs calcium is present in the urine and calcium crystals can obstruct the kiney nephrons (tiny kidney tubules) and cause pain. 24 hour calcium excretion should be < 300 mg or < 4mg/kg/24 hours. ...Read moreSee 1 more doctor answer
Yes: There are a variety of other causes of granulomatous disease in the gut; half of crohn's cases don't show granulomas in the first place, and i suspect no pathologist would make the call except upon examining the clinical and imaging findings as well. The diagnosis of crohn's, and the decision how to treat, is usually made by collaboration among physicians. ...Read more
Which is better, pet scan or cisternogram? Father already had a cisternogram results borderline positive. Should pet scan be done or repeat cisterno
Tested positive on the ELISA test for hsv2, a month later tested negative via western blot 2 years after possible exposure . Which test to believe?
Both!: ELISA is very sensitive and sometimes gives a false positive. Interfering substances in serum can make the test look positive. On the other hand, Western Blot is very specific. It does not light up unless you really have antibodies to HSV. So, both tests were "right" , but the Western blot indicates that you do not have the antibody to HSV and have not been exposed. ...Read more
Is it possible to have a false negative blood test for pregnancy? I've had positive home pregnancy tests for 2 weeks but my blood test said negative
Get evaluated.: it is impossible to know what the cause of a positive fecal occult blood test means without doing the evaluation necessary. Sometimes a positive test can be the first clue to colon cancer or a large polyp which could eventually be a colon cancer. It is very important for you to follow up on this test. Do not skip this evaluation. It could save your life. Good luck. ...Read moreSee 1 more doctor answer