5 doctors weighed in:
How long does it take for syphilis to be detectable in a blood test?
5 doctors weighed in

Dr. James Ferguson
Pediatrics
2 doctors agree
In brief: 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.

In brief: 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.
Dr. James Ferguson
Dr. James Ferguson
Thank
Dr. Gurmukh Singh
Pathology
1 doctor agrees
In brief: Usually about 2 wks
From the time of infection, blood tests become positive in about two weeks in most people.

In brief: Usually about 2 wks
From the time of infection, blood tests become positive in about two weeks in most people.
Dr. Gurmukh Singh
Dr. Gurmukh Singh
Thank
Get help from a real doctor now
Dr. Christopher Crosby
Board Certified, Dermatology
12 years in practice
93K people helped
Continue
108,000 doctors available
Read more answers from doctors