What it measures
Looks for the DNA of Treponema pallidum, the bacterium that causes syphilis, in a swab taken from a sore. It shows whether the bacteria are in the sore at the time of the test.
Why people test it
- Tested when there is a sore or ulcer on the genitals, around the anus or in the mouth.
- Used alongside a blood test, as antibodies may not have appeared yet when a sore first shows.
Typical range
Reported as detected or not detected. Methods vary between labs, and your report shows how the lab reads the result.
Finger-prick or vein?
A swab from the sore, not blood. Offered as a kit only, and it needs a sore to swab.