Doctor insights on:
Thyroid Function Test False Negative
Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?
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
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
Erosive gastritis. h.pylori blood test positive, breath test positive, stool antigen test negative, biopsy negative. what to do ?
Treat it: The positive H. pylori antibody test is not a reliable indicator of current infection. The gold standard for H. pylori treatment is the gastric biopsy, and this is negative in this patient. However, I am impressed by the positive breath test and erosive gastritis. I would have expected stool antigen to be positive, as it mirrors the breath test. Given the discrepant results, treat the patient. ...Read more
3 hep c antibody screen tests done. First low positive, 2nd two neg. thoughts? Could the two negatives be false negatives?
What tests did they do?
-rpr, rfx qn rpr/confirm tp-pa
value (normal range
non reactive (non reactive
Negative result for thyroid peroxidase antibodies tpoab . Necessary to test my thyroglobulin antibodies tgab ?
Anti-thyroglobulin: Studies have shown that 99% of patients with hashimoto's thyroiditis have anti-microsomal antibodies, whereas only about 1/3rd had anti-thyroglobulin antibodies. In addition, 10-20% of persons without thyroid problems have anti-throglobulin antibodies (tg-a). These persons are likely at higher risk for future problems and should be watched more closely however, testing for tg-a is not necessary. ...Read moreSee 1 more doctor answer
Immunochromatography rapid antibody test negative @42 days.Blood serum CMIA screening test@50 days(7th week) is 0.15 non reactive. Results conclusive?
Autoimmune thyroid: Anti-tpo antibodies are usually elevated in people with hashimotos thyroiditis and often with graves disease. However, the test is not perfect, and is sometimes negative, even if you have hashi. Also, some labs don't perform the test well. See your endocrinologist. ...Read more
The blood test for: H. Pylori checks for antibodies against the bacterium. Antibodies are proteins that help your body fight off infection and they may be detectable indefinitely, even for a lifetime. Biopsy & urease tests check for presence of an active infection. (+) H. Pylori blood test with negative biopsy & urease suggests you had the infection in the past but that it's not currently active. ...Read more
Hepb surface antigen positive, confirmatory test negative, antibody and core negative, should I worry?
Possibly: Do not understand how initial test was positive and "confirmatory" test negative. Need to repeat these, although you may be in the "window" period, when antigen is being consumed by forming antibody and neither is measurable. Wait 3 months and retest antibody titers. By then you may be hepb antibody and core antibody positive, in which case you are immune. ...Read more
True or False Test?: A "false negative" test means the presence of a "confounding variable" that invalidates the test because it nullifies a test that would probably be positive if the variable were absent, like a brochodilator medicine (e.g.various inhalers and pills for asthma). So the test should be done in the absence of those medications, if possible-or-used as a validation as to the medication's effectiveness. ...Read moreSee 1 more doctor answer
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