TPHA Test

Know More About This Test

TPHA is a confirmatory blood test for syphilis, detecting antibodies against Treponema pallidum. It remains positive for life once infected, even after treatment.

Why Is This Test Recommended?

Confirm syphilis infection

Antenatal screening

Blood donor screening

Neurological symptoms of unknown cause

Understanding TPHA

It is used after a screening test like VDRL. A positive TPHA confirms exposure.

FAQs

Does TPHA indicate active infection? Not always, as TPHA detects lifelong antibodies from past exposure rather than current bacterial activity, so additional tests like VDRL titers or dark-field microscopy are needed to distinguish active from resolved syphilis.

Can it become negative after treatment? No, TPHA typically remains positive for life after infection, even with successful antibiotic treatment, making it a reliable marker of lifetime exposure but not a gauge of cure.

Is fasting required? No, fasting is not required for the TPHA test, as it measures specific antibodies unaffected by recent food intake, allowing for convenient scheduling anytime.

Is it used alone? No, TPHA is not used alone but as a confirmatory test following initial screening like VDRL or RPR to verify true positives and avoid false alarms from non-specific reactions.

Is it reliable? Yes, TPHA is highly reliable with excellent specificity for detecting Treponema pallidum antibodies, making it a gold standard confirmatory test in syphilis diagnosis worldwide.