Treponema pallidium hemagglutination assay (tpha) Test
- Category
- Infection
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 3 days
- Fasting
- No Fasting
- Age
- 5+ Years
TPHA detects antibodies specific to Treponema pallidum, the bacterium that causes syphilis.
Confirms a positive VDRL/RPR result and diagnoses syphilis. TPHA usually stays positive for life even after treatment.
Fever, rash, jaundice, suspected exposure to infection, before surgery or pregnancy, as advised by a doctor.
No fasting needed.
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
Not always — it can stay positive after successful treatment; VDRL titre helps judge current activity.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 31–55 hours after the sample reaches the lab. You will receive the report online.