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Doctor insights on: How To Read A Positive Tb Test

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What can cause a positive PPD test reading?

What can cause a positive PPD test reading?

Mycobacteria: Tuberculosis and other members of the same family, some less severe. There are also "positives" that aren't true in duration - like an allergic reaction at the site within minutes of ppd placement. ...Read more

Dr. Scott Lindquist
617 doctors shared insights

Mycobacterium Tuberculosis Infection (Definition)

Mycobacterium tuberculosis is an infectious organism that spreads by droplets coughed out by an infected person. Infection is established initially in lungs, but can spread within lungs & to other body parts, or can become latent, with reactivation occurring years to decades later. With effective treatment, it can be completely eliminated although drug resistant ...Read more


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What do positive TB test results mean? How should I interpret the positive result of a TB test?

What do positive TB test results mean? How should I interpret the positive result of a TB test?

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 more

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Can you explain if it's safe to retake a tuberculosis test after testing positive?

Can you explain if it's safe to retake a tuberculosis test after testing positive?

Repeat TB test: It is not a good idea to repeat a TB skin test if a previous test is positive as you can have a much larger reaction that may cause a problem. If you are required by work to have a screen for tB again , an X-ray is usually recommended. ...Read more

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When a person test positive for MRSA them tests negative how is it possible for them to test postive again? What precautions need to be taken?

Incomplete: Eradication is common. We treat with phisohex, bacterium, bactroban, (mupirocin) then we test the nares or the throat. We can miss it if temporarily it is eradicated in the areas we test, or the load is less and we miss it from swabbing. Good hygiene, good hand washing is utmost in preventing spread. ...Read more

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Dr. James Lin Dr. Lin
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How to read a sperm test results?

Dr. James Lin Dr. Lin
1 doctor agreed:
How to read a sperm test results?

Here are some ...: Hi! Zaldy5, You probably meant semen test. Sperms comprises less than 2 % of total semen (1.5-4.5 cc). Semen analysis for infertility is to look into the volume, total sperm count and viscosity of semen as well as the concentration, motility, maturity, and shape of sperms so to get a rough idea of overall semen quality for favoring fertilizing the awaiting egg. ...Read more

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How to get a false positive on a pregancy test ?

How to get a false positive on a pregancy test ?

It means either: The test itself was wrong or the person reading the test read it wrong. Either way, take another one or see your doctor to be sure. ...Read more

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Can you tell me if on a random drug screening test what will show up false positive for a diabetic?

Can you tell me if on a random drug screening test what will show up false positive for a diabetic?

Probably not but ...: What is being looked for is the value of the glucose in the blood at that moment that the blood is drawn. It is very specific for the amount of glucose. If you ate a food containing glucose or another carb which could be converted to it not too long before the blood was drawn then the value of the glucose would rise. A better test which looks back 90 days is Hemoglobin A1c. ...Read more

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Can you get a false positive on a urine test for chlamydia?

Can you get a false positive on a urine test for chlamydia?

Very unlikely: Urine test for chlamydia has comparable sensitivity and specificity as cervical or urethral specimens which are high if NAAT was use as a test (Nucleic acid amplification tests (NAATs). ...Read more

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Is it possible to get a false negative for marijuana on a doctors office drug test? At home drug test shows positive

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 more

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How does a doctor read a TB test?

See below: They exam the site of the test looking for any swelling. Then the amount of swelling is measured, if present. ...Read more

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How accurate is a skin biopsy for lupus? Can you have a false/ positive test result?

How accurate is a skin biopsy for lupus?  Can you have a false/ positive test result?

Lupus biopsy: Biopsy of lupus has a number of features that lead to diagnosis: a thickened basement membrane, vacuolar alteration of basal keratinocytes and superficial and deep inflammatory infiltrate. Lupus has a number of different forms in the skin and there are times when it is not easy to differentiate it from other types of skin inflammation. There are other tests to support diagnosis. ...Read more

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Can IgM test be inaccurate & give false results especially when i tested negative for IgG herpes? Whats the best test for hsv? Help please please

Can IgM test be inaccurate & give false results especially when i tested negative for IgG herpes? Whats the best test for hsv? Help please please

HSV: Hsv is often a clinical diagnosis. Igm is the antibody produced earliest in a viral infection so if this was positive, then it means an acute infection. Igg is produced later in the infection and/or after infection has cleared. Igg will probably turn positive at a later time, but treating the hsv with an oral anti-viral is most important, not the igm/igg results. ...Read more

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How will a positive parvo test look?

How will a positive parvo test look?

Complicated: Positive IgG antibody infers an infection that has resolved in the past or began more than 7 days prior. So it does not prove a current issue. IgM antibodies infer new infection, but because of immune complex formation in setting of acute disease, these can be false negatives. In that case, pcr can be performed and has higher chance of positivity in context of immune complex phenomenon. ...Read more

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How to avoid a false negative on a toxoplasmosis blood test?

How to avoid a false negative on a toxoplasmosis blood test?

Nothing: A false negative on this type of testing is a function of the test itself, so nothing that you do, or don't do, will change the accuracy of the test. Good luck. ...Read more

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What does a positive TB test mean?

Chest X ray: It is possible to have active TB with very little symptoms especially early on. However, it is more than likely that you carry the germ for TB in a dormant form, this is called latent tb. No symptoms are expected with latent tb. ...Read more

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Can having TB make you read a positive on an hiv/aids test?

Can having TB make you read a positive on an hiv/aids test?

No: Tb can occur with HIV but does not cause the test to be positive on its own. ...Read more

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How long will a rubella IgM test stay positive for? I have an immunity according to the IgG test. However im pregnant and the IgM test was positive.

How long will a rubella IgM test stay positive for? I have an immunity according to the IgG test. However im pregnant and the IgM test was positive.

6 weeks: Presence of rubella-specific igm antibody indicates recent infection, however, false-positive results do occur. Follow-up igg titer in 2-3 weeks will be of help in confirmation of diagnosis. ...Read more

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How do I know a tuberculosis test is positive?

Touching the skin: There are 2 TB test. The skin test, ppd, if positive will elicit an induration underneath the skin. If the diameter is 15 mm or larger is positive. If in doubt you can request your physician to order a blood test called quantiferon gold. ...Read more

Dr. Klaus d Lessnau
1,217 doctors shared insights

Tuberculosis (Definition)

A potentially serious infectious bacterial disease that mainly affects the lungs, but can ...Read more