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Doctor insights on: Blood Screened Syphilis

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Why is the blood supply screened for syphilis when syphilis is not transmitted via infected blood?

Why is the blood supply screened for syphilis when syphilis is not transmitted via infected blood?

Blood can transmit: Blood contact very rarely can transmit syphilis. It probably requires much more blood than possible during sexual exposure, shared needles, etc, but transfusion can do it, especially with non-refrigerated blood products. It's extremely rare and even without testing, probably there would be few if any cases, at least in the US. OTOH, testing is easy, cheap, and ingrained by history and habit.

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Dr. H. Hunter Handsfield
528 doctors shared insights

Syphilis (Definition)

A sexually transmitted disease involving a ...Read more


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What could be the reason that the blood supply screened for syphilis if syphilis is not transmitted via infected blood?

What could be the reason that the blood supply screened for syphilis if syphilis is not transmitted via infected blood?

Transfusion syphilis: Treponema pallidum which causes is syphilis is a recognised risk of blood transfusion. Organisms from an infected blood donor can infect blood recipient, hence all blood is screened for syphilis.

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Syphilis is said to be transmitted sexually, via contact with an infected sore. If that's the case, why is the blood supply screened for syphilis?

Syphilis is said to be transmitted sexually, via contact with an infected sore. If that's the case, why is the blood supply screened for syphilis?

Transfusion syphilis: Treponema pallidum which causes is syphilis is a recognised risk of blood transfusion. Organisms from an infected blood donor can infect blood recipient, hence all blood is screened for syphilis.

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How long does is take syphilis to be seen in the blood work?

How long does is take syphilis to be seen in the blood work?

4 weeks usually: The fta-abs (fluorescent treponemal antibody absorption test can be used to detect syphilis except during the first 3 to 4 weeks after exposure to syphilis bacteria. Special darkfield microscopy is used mainly to diagnose syphilis in an early stage.

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I think that I might have syphilis. Where is a blood test taken?

I think that I might have syphilis. Where is a blood test taken?

Your doctor: Your doctor can order a blood test and most hospital labs are capable for performing the test. A community health clinic may offer the service.

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How much time does it take for syphilis to show up in a blood test?

How much time does it take for syphilis to show up in a blood test?

Syphilis: Signs/symptoms of Syphilis may occur anytime from 3-90 days after exposure, though usually around 3 weeks. The blood test will likely be positive in this time frame. Many people are infected, however, and have no symptoms at all.

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How long does it take for syphilis to be detectable in a blood test?

How long does it take for syphilis to be detectable in a blood test?

Weeks to months: Testing for syphillis relies on both non-specific tests that can be falsley +or - and more specific germ tests as backup. A + or rising level of a screening test is confirmed by a germ test. The most specific test is finding the germ in material from a lesion. Since transmission ~30% per contact with an infected source, a single dose of penicillin is often given as early as exposure is suspected.

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What is a tpha quantitative blood test? Can this test detect latent stage syphilis?

What is a tpha quantitative blood test? Can this test detect latent stage syphilis?

Yes it can: The TPHA test (Treponema pallidum hemagglutination) is a confirmatory test for syphilis. Usually it is done only after a positive screening test, such as the VDRL, RPR, or an EIA test. If you have had negative results on one of these plus the TPHA, you can be 100% certain you don't have syphilis and probably never did.

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Can syphilis get in your blood?

Can syphilis get in your blood?

Yes: Syphilis is transmitted by skin to skin contact with an infected sore called a chancre. Over time the organism causing syphilis ( a spriochete) circulates through the blood stream of the host causing problems throughout your body. It is not passed by blood though from person to person.

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What are the symptoms for syphilis in the blood?

Vague: You can get skin lesions and other signs of infection but get a blood test. This is nothing to mess around with. Syphilis has three stages, and it gets harder to treat the longer you wait. A simple blood test will tell you if its in the blood. So, get off your duff, and get it done!

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Is there other types of tests for syphilis besides blood?

Yes: If syphilis of the brain is suspected, we will check the cerebrospinal fluid. And sadly, sometimes syphilis is diagnosed only at autopsy, after it has produced its terrible long-term effects. Thankfully, nowadays this is uncommon.

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Does herpes br mistaken for syphilis in a blood test?

Does herpes br mistaken for syphilis in a blood test?

No: The tests for herpes simplex virus (herpes) and t. Pallidum (syphilis) are completely different and cannot be confused or mistaken for one another in a blood test.

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Can RPR blood test be able to detect if you have syphilis years ago?

Depends: Rpr tends to decrease in value following successful treatment of syphilis, though it can remain positive for a long time. An other test, specific for treponemal antibodies, generally stays positive.

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When you have a syphilis lesion would the blood test be able To detect syphilis in blood by then?

When you have a syphilis lesion would the blood test be able
To detect syphilis in blood by then?

No: Primary syphilis is a painless ulcer on the genitals. Generally available tests do not become positive for two to six weeks. Experienced physicians can diagnose clinically and treat.

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Would 28 days after exposure syphilis blood test be accurate and when you have a lesion does that mean syphikis is detect. In blood?

 Would 28 days after exposure syphilis blood test be accurate and when you have a lesion does that mean syphikis is detect. In blood?

May be: The test for syphilis may be positive 28 days after exposure, but a negative result would not rule infection and you should repeat the test in three months. It would be prudent to see your doctor immediately if you have a lesion.

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I took an at home syphilis blood test, and I want a second opinion on wether it's positive or negative. Attracted are photos of the test ?

I took an at home syphilis blood test, and I want a second opinion on wether it's positive or negative. Attracted are photos of the test 
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Second Opinion: You can get a second opinion through the Health-Tap Prime service. It will allow you to upload your results and have a live doctor look at them. (Thats not an option on this public forum.) Best wishes!

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How soon does syphilis show up in a blood test?There are diff names for certain tests, does it matter what test?Do they detect all in same time frame?

Syphilis: Usually within the first six weeks after a possible exposure. Syphilis is unique in that when one is infected in their mouth, vagina or rectum they may miss the first stage of syphilis because the sore it causes does not hurt. If one has an unexplained sore in this scenario then testing definitely should happen. But, in general six weeks.