Question 1

good evening doctor. my partner of 4 years and i recently went to get tested for stds and he came up positive for chlamydia. i came out negative. he swears it's only been me for 4 years. is there a possibility that the test could've been a false positive?

Accepted Answer

False Positive: No test is 100%. There will be false positives and false negatives. You can always get another test.  That being said, if you both have been monogamous for the past 4 years why the tests?  Just food for thought.  Additionally, if you have had antibiotics recently it could gave cured any infection you had. Remember men usually have no symptoms.

Question 2

what would a false negative and a false positive mean on an std screen test?

Accepted Answer

See below: False negative & false positive results are testing errors (meaning the test results were wrong).  In this case...
A "false negative" result means that despite the test being negative, the person actually does have the infection. 
A "false positive" result means that a positive test result occurred in someone who really did not have the infection.

Question 3

chances of having a false positive herpes type 1 blood test?9.1 igg.while other stds remain negative 0.0 igg.had my test 2 weeks later after exposure.

Accepted Answer

Prob. True Positive: Herpes type 1 is the herpes virus commonly associated with the mouth (cold sores).  It can be positive without any other tests being positive.  Many people are + for hsv 1 by the time they enter school, picking up the virus from family members.  
Hsv symptoms may take 2-14 days after exposure to show up and longer for a positive test.  You may need to be retested to be sure.

Question 4

uti medicine can cause false positive std test?

Accepted Answer

No: If you had testing for an std (i will assume that you mean from a culture of your cervix) then you should absolutely assume that it is a positive result.  It needs to be treated and you need to go back in in 1-2 weeks for a "test of cure".

Question 5

my girlfriend has pcos and she has been tested positive for an std.  is it possible that the issue associated with pcos cause a false positive result?

Accepted Answer

Highly unlikely,,,: This is highly unlikely.  Pcos (polycystic ovary syndrome) is a condition where the ovaries develop cysts because the follicles containing the egg rupture less often and so ovulation doesn't happen normally.  This has practically no relation to an std which is due to contact with an infected individual.  Pcos can cause high hormone levels but an std tests for se kind of infection.  Best of luck.

Question 6

recently had a routine std check and didnt expect much. labcorp results came back and said i had an index value of 3.42 for the hsv-2 test. this qualifies as the low positive range. is it likely a false positive; especially with no symptoms?

Accepted Answer

Probably: Index value of 3.42 is borderline positive, borderline negative, depending lab. Probably doesn’t mean much but should be discussed in greater depth with an Infectious Diseases doctor

Question 7

std panel all came negative except hsv-1 igg test- high positive(22.5). hsv-2 igg negative. i have no symptoms or any outbreaks ever. last year i tested all negative. i am really worried. can i be false positive for hsv-1 or do any confirmatory test?

Accepted Answer

: Yes HSV 1 tests can be false positive. It is the HSV-2 which causes problems in humans and worrisome not so much HSV!. So do not worry much and have your doc repeat a  western blot type of test next time

Question 8

my igg hsv-1 results came back positive with an index value of 1.35. ive never had a positive std/sti result in the past, have had no symptoms, igm was negative. should i retest considering the low index value? i read this could be a false positive?

Accepted Answer

: More than half of adults have been infected with HSV 1 and it usually is harmless other than occasional cold sores. Do not worry about this result and it is not worth repeating.

Question 9

could bring on an antibiotic like keflex give a false positive result on an oraquick oral test? i havent taken the std hiv test yet but want to make sure first?

Accepted Answer

Do a blood test: Oraquick is not a diagnostic tool for HIV. Any result (positive or negative) needs to be reevaluated with a blood test for either nucleic acids (virus), antibody or antigen. If you have unprotected sex, sex with someone who is HIV positive or in a high risk group, you should have a blood test at 14 days and at 6 months post exposure. Talk to a Dr about using PreP. Keflex not a problem.

Question 10

i had sex 8 months ago and took a std test today. the results of the test for hiv antibodies reflected negative yet, an rna test reflected positive. i have zero symptoms and will be retesting tomorrow. what are the odds of me having it/false positive?

Accepted Answer

Probably false pos: These are unusual test results. Almost certainly one of them is false, probably the RNA test, especially if your exposure was low risk (e.g. heterosexual), and probably you don't have HIV. Do not simply go through a laboratory or otherwise arrange for your your own re-testing. See a doctor about this, preferably an STD/HIV or infectious diseases specialist. Good luck.

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Doctor answers about:

How common is it to get a false positive on an std tedt

A member asked:

Good evening doctor. my partner of 4 years and i recently went to get tested for stds and he came up positive for chlamydia. i came out negative. he swears it's only been me for 4 years. is there a possibility that the test could've been a false positive?

A member asked:

What would a false negative and a false positive mean on an std screen test?

A member asked:

Chances of having a false positive herpes type 1 blood test?9.1 igg.while other stds remain negative 0.0 igg.had my test 2 weeks later after exposure.

A member asked:

Uti medicine can cause false positive std test?

A member asked:

My girlfriend has pcos and she has been tested positive for an std. is it possible that the issue associated with pcos cause a false positive result?

A member asked:

Recently had a routine std check and didnt expect much. labcorp results came back and said i had an index value of 3.42 for the hsv-2 test. this qualifies as the low positive range. is it likely a false positive; especially with no symptoms?

A member asked:

Std panel all came negative except hsv-1 igg test- high positive(22.5). hsv-2 igg negative. i have no symptoms or any outbreaks ever. last year i tested all negative. i am really worried. can i be false positive for hsv-1 or do any confirmatory test?

A member asked:

My igg hsv-1 results came back positive with an index value of 1.35. ive never had a positive std/sti result in the past, have had no symptoms, igm was negative. should i retest considering the low index value? i read this could be a false positive?

A member asked:

Could bring on an antibiotic like keflex give a false positive result on an oraquick oral test? i havent taken the std hiv test yet but want to make sure first?

A member asked:

I had sex 8 months ago and took a std test today. the results of the test for hiv antibodies reflected negative yet, an rna test reflected positive. i have zero symptoms and will be retesting tomorrow. what are the odds of me having it/false positive?

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