Diagnik Health Library
Plain-English guides to the infections people test for, written without scare tactics and referenced to public-health sources. Screening information — not diagnosis or treatment.
Not sure what to test for?
HIV
What HIV is, how testing works, and how timing changes what a result means. Every guide is written in plain English and cites public-health sources.
All 6 guides →
Syphilis
Syphilis is easy to miss and straightforward to cure. These guides cover the stages, the symptoms people overlook, and how testing works.
All 5 guides →
Chlamydia
The most commonly reported bacterial STI in the US, and usually silent. What it does, and how it is found.
All 4 guides →Gonorrhea
Gonorrhea is common, frequently silent and increasingly resistant to antibiotics. Here is what that means for testing.
All 4 guides →Trichomoniasis
A parasite rather than a bacterium, one of the most common curable STIs, and usually symptom-free.
All 4 guides →
STI testing
The practical questions: when to test, what a window period is, and what an at-home test can and cannot tell you.
All 7 guides →