Doctor insights on:
Cost Of Mantoux Test
Wheal: The tuberculin skin test is administered to the upper third of the forearm (palm up) ?2 inches from elbow, wrist, or other injection site. If neither arm can be used, it can be given in the back of the shoulder. Use a 1/4 to1/2 inch 27-gauge needle or finer tuberculin syringe. It should form a wheal 6-10 mm in diameter, and it is interpreted 48-72 hours later. ...Read more
Tb skin test negative, quentform TB test negative, bone marrow biopsy results indicative of TB (reacts to ziehl niehlssen), PCR negative. How come?
No...actually: The zn stain is a broad stain for acid fast bacilli of which mycobacterium tuberculosis is one of many. The specific tests like quantiferon or the pcr test are against you having tb. The culture is the "gold standard" but you will need to wait for it. It might turn out be a cousin of TB and that too will grow out of culture. Stay on TB meds until they are certain of the AFB positive organism. ...Read more
What is the likelihood of a false negative on a PCR RNA TMA HIV test at 15-20 days post PEP/post exposure? I have heard of false positives.
Pt in Kuwait, low risk sex activity. PCR equivocal. Repeating. Other tests neg. his question is this test done the same US, Germany, London,test +/-?
Depends: PCR is very specific and sensitive, but all tests have a false positive rate, and for PCR, the number is very small. I don't think it should matter where the test is redone as long as the technique is the same or similar ...Read more
How reliable negative result of p24 antigen and hiv antibody test at 45 days? percent of people get accurate result on the said test by this period?
Does post exposure prophylaxis(1 month ZDV+3TC) for HIV effect the results of a rapid kit HIV test or ELISA for Hiv test?
Hi. Is ecl HIV test for ag p24 a kind of western blot test? Does that mean a negative of that after 75 days confirms the negative status ?
No : Most often, p24 antigen testing is performed as part of a combination test that detects both p24 antigen and HIV antibody and is used to screen for and help diagnose an HIV infection. Occasionally, it may be used as an individual test to screen for early HIV infection, and may become negative as antibody develops (75 days). The more recent screening antibody testing is very sensitive and specific. ...Read more
Not certain the: numbers but you want to avoid checking HIV screening tests in the first 12 weeks due to the latent period of the virus. Most pundits recommend to test between 3-6 months of exposure where antibody levels tend to correlate with presence of virus in sufficient quantities for measurement. ...Read more
HIV PCR test: We now consider this rest to be 100% accurate by day fourteen. ...Read more
Question regarding a standard RPR test does an RPR test effectively detect any strains of the herpes viruses?
Will a higher volume than recomended of urine given for a aptima 2 tma gonorrhea test still yield accurate neg results?
HIV antibody Testing: You should have a valid answer by twelve weeks on this test. It is not the best test in an acute exposure. Your question also implies that you do not know that HIV infection can be prevented after a high risk exposure as long as the appropriate action is taken within 72 hours of exposure. This process known as post exposure prophylaxis is very effective at preventing infection. ...Read moreSee 1 more doctor answer
Infection with Tb: When someone is infected with tuberculosis (TB) germs, the body develops a protective response against them. The TB skin test is a test of the body's response to tb, not the germs themselves. One can have an active infection where they are coughing out TB germs and are a risk to spread tb. Or the body may have had the infection long ago and controlled it so there is no risk now of spread. ...Read moreSee 1 more doctor answer
Unlikely: All tests are subject to prior probability( the likelihood of a condition before any tests) and a refined probability, modified by test results. That being said the HIV eia test is among the most accurate in medicine, and when confirmed by a western blot, approaches 100% dr ted butler. ...Read more
How accurate is the limulus amebocyte lysate (lal) test in detecting gram neg bacterial endotoxins? What r limitations of this test?
Newer test available: Endotoxin (lipopolysaccharide) are heat-stable breakdown products of gram-negative bacteria as the main constituent of the outer cell membrane. Lal test has been the standard for years, only practical method for direct detection of endotoxin. Recently, a similar assay based on recombinant factor c has been introduced. An elisa test, endolisa reportedly has advantages over the established lal. ...Read more
I did a DNA PCR test for HSV & i got the result: -humanes herpesvirus-dna ((typ 7, pcr) (eb) : negative limit of detection:100 copies/ml.So i'm clean?
Hsv-7 isn't detected: Your question will require some clarification since you stated being tested for herpes simplex virus, the result you describe tests for human herpesvirus type7, which cannot be detected by pcr testing below 100 copies per ml . Hhv-7 is not the same as hsv. Though theyboth belong to the same heresviridae family. ...Read more
You R protected: A positive rubella titer means your body has developed a protective level of antibodies to the rubella virus. You either had rubella or had an immunization.To a woman it means you will not need to worry during pregnancy that your fetus will suffer the devastating effects of rubella. That virus can cause miscarriage, organ damage, blindness & deafness if it strikes during pregnancy. ...Read more
Accuracy of ELISA: The elisa test is 99+% accurate (sensitive and specific) in individuals who have had the infection long enough for the assay to pick it up. For the 3rd generation tests used today, it can reliably detect individuals infected w/hiv at approximately 15 days. The 4th generation wh/tests for HIV antigen and antibody may show results even sooner. Always have testing done at a reliable certified lab. ...Read more