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Doctor insights on: Thyroid Function Test False Negative

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Hyperthyroidism and positive pregnancy tests?

Hyperthyroidism and positive pregnancy tests?

See your doctor: Thyroid medication often requires dose adjustments in the first part of pregnancy. You should continue on your regular medication for now, but call and make an appointment to be seen soon. ...Read more

Dr. Janice Alexander
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...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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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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Does 3 Hiv negative test confirms your HIV negative?

Does 3 Hiv negative test confirms your HIV negative?

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

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Erosive gastritis. h.pylori blood test positive, breath test positive, stool antigen test negative, biopsy negative. what to do ?

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

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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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What tests did they do? Test -rpr, rfx qn rpr/confirm tp-pa attribute rpr value (normal range non reactive (non reactive result negativ

What tests did they do?

Test

-rpr, rfx qn rpr/confirm tp-pa 

attribute

rpr 	

value (normal range

non reactive (non reactive 		

result

negativ

Syphyllis : This test was performed as a part of std screening. According to this test, syphilis (at least the secondary form and on) are absent. A directed history, risk factor assessment, symptom inventory and an exam are as if not more important. Practice safety. ...Read more

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Does blood test for thyroid function show hormone irregularities?

Does blood test for thyroid function show hormone irregularities?

Only thyroid: If the only hormone measured was thyroid, then that is the only hormone abnormality that would be detected. ...Read more

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Can graves disease cause false positive pregnancy test?

Can graves disease cause false positive pregnancy test?

NO: While thyroid stimulating hormone (TSH) and a portionof the pregnancy hormone (beta hcg) share some common components, graves disease wil lnot cause a fasle positive pregnancy test. It works in the revers fashion- bhcg can stimulate the thyroid. ...Read more

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Negative result for thyroid peroxidase antibodies tpoab . Necessary to test my thyroglobulin antibodies tgab ?

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 more

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Why would my thyroid antibodies test be negative?

Why would my thyroid antibodies test be negative?

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

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Blood tests positive but biopsy and urease test negative for h.pylori. Is this normal?

Blood tests positive but biopsy and urease test negative for h.pylori. Is this normal?

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

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Hepb surface antigen positive, confirmatory test negative, antibody and core negative, should I worry?

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

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What causes false negative results in a methacholine test?

What causes false negative results in a methacholine test?

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 more

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