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Doctor insights on: Toxicology Test Results

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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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How to read urine test results?

How to read urine test results?

Leave it for the lab: Laboratory technical personnel are trained to perform such tests and you should leave the interpretation to them. ...Read more

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Acth stimulation test results accurate?

Acth stimulation test results accurate?

Depends: I'm assuming no lab errors. If you get a very high cortisol spike after receiving the first dose of ACTH, you are reassured you do not have Addison's. No, or a very small spike, strongly suggests Addison's. In-between... that's why there are specialist endocrinologists. ...Read more

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Will an unrefrigerated urine sample cause an EtG test to test false positive?

Will an unrefrigerated urine sample cause an EtG test to test false positive?

No: ETG detects a metaboloite of alcohol. The modification occurs in the liver. If glucose is present in the urine that could get fermented into alcohol, but not into Etg as that requires an action by the liver. ...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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Please interpret- C.trachomatis RNA TMA Result: Detected. Standard range: Not detected. Test performed using the Aptima Combo2 (R) assay gen-probe(r)

Please interpret-
C.trachomatis RNA TMA Result: Detected. Standard range: Not detected. Test performed using the Aptima Combo2 (R) assay gen-probe(r)

You have chlamydia: "Detected" means the test found chlamydia -- i.e. a positive result. Return to the doctor or clinic where the test was done for treatment. (If you tested yourself at a lab, see a doctor or clinic ASAP.) Your current or recent sex partner(s) also need treatment. Good luck! ...Read more

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Blood test shows élévated bilirubin , urine test négative for bilirubin. Any explanation??

Blood test shows élévated bilirubin , urine test négative for bilirubin. Any explanation??

Unconjugated: Bilirubin exists in the blood in both the conjugated and Unconjugated forms. Only the conjugated can enter the urine. If you feel well, and this is new, you very likely have Gilbert's non-disease. Best wishes. ...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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Pathology lab test for thalassemia?

Pathology lab test for thalassemia?

Electrophoresis: Blood counts can suggest thalassemia (small red blood cells). Some thalassemia can be confirmed with electrophoresis, which quantifies the different types of hemoglobin present in rbcs. Similar studies can be done on the parents for additional info. ...Read more

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Can paraneoplastic panel (through mayo clinic) be false negative results?

Can paraneoplastic panel (through mayo clinic) be false negative results?

Difficult matter: This test is only useful when it is Abnormal. But it does not help at all when it is normal panel(which means there is no abnormaility found but it does not exclude any diagnosis because there is nothing predictable about a paraneoplastic panel). So you can not say it is false negative . it is designed to be useful only if it shows an abnormality that supports a clinical diagnosis of cancer . ...Read more

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What does a high positive ANA ifa test and negative choice antibody test mean?

What does a high positive ANA ifa test and negative choice antibody test mean?

See details: I have never heard of a choice antibody test. I positive ANA must be evaluated in the context of the clinical picture. It is a screening test for lupus but can be positive in numerous other diseases and often in people without any disease. ...Read more

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Hcg 50 positive blood test two negative urine please help.

Hcg 50 positive blood test two negative urine please help.

Recheck blood: You need to have the blood levels checked again. You expect the level to about double in 2 days with a normal pregnancy. ...Read more

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Invalid pregnancy test result. How come?

Invalid pregnancy test result. How come?

Invalid preg test?: Urine pregnancy tests can be "too early" to be valid. You need to be at least 5 days past your expected period. Urine also needs to be 1st of the morning (concentrated) to be valid. ...Read more

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What do clear drug test results mean?

What do clear drug test results mean?

Need more info: What test? If you mean a urine drug test for substances of abuse, that would mean the substances that were tested for were not detected and you cannot be accused of substance abuse. ...Read more

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How to interpret thyroid test results?

How to interpret thyroid test results?

No easy answer: The best way to interpret thyroid test results is to talk to your doctor. ...Read more