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.