TB Skin Test in Mississauga
The Tuberculin Skin Test (TST), also known as the Mantoux test, screens for exposure to tuberculosis (TB). Dr. Saldanha offers TB skin testing at Saldanha Health Centre for employment, school admission, immigration, and clinical requirements — with results documentation provided.
What Is the TB Skin Test?
The TST is a diagnostic test — not a vaccine. A small amount of tuberculin PPD is injected into the skin of the forearm (Day 1). You return 48–72 hours later (Day 2–3) for a trained clinician to measure the reaction. Two visits are required; the test cannot be read before the 48-hour mark.
A positive result indicates exposure to TB bacteria, not necessarily active disease. A positive TST requires a chest X-ray to rule out active tuberculosis.
Common Reasons for TB Skin Testing
Healthcare workers (hospitals, long-term care, clinics) — required at hire and periodically
School and college admission requirements
Daycare and childcare workers
Immigration and IRCC permanent residence (PR) applications
Food handlers and certain regulated industries
Individuals who have traveled to or lived in TB-endemic countries
Reading & Interpretation
Positive Thresholds
- •10 mm+ — positive for most individuals
- •5 mm+ — positive for immunocompromised patients or close TB contacts
Available Tests
- •Single-step TST — standard for most purposes
- •Two-step TST — baseline screening for healthcare workers
- •IGRA blood test — alternative to TST; ask Dr. Saldanha if appropriate
Pricing & Coverage
For current pricing, see our full vaccination fees page. Most travel vaccines are not covered by OHIP but may be reimbursable through private insurance or employer benefit plans — we provide official receipts for all vaccinations.
Book Your TB Skin Test
Two visits required — call to schedule both at once.
Call (905) 890-2757550 Matheson Blvd W, Unit 107, Mississauga, ON L5R 4B8
TB Skin Test — Frequently Asked Questions
What is the Mantoux test?
The Mantoux test (Tuberculin Skin Test / TST) is the standard method for detecting exposure to Mycobacterium tuberculosis. A small amount of tuberculin purified protein derivative (PPD) is injected just under the skin of the forearm. The injection site is then read 48–72 hours later by a trained clinician who measures any induration (raised bump). It is a diagnostic test — not a vaccine.
What does a positive TB skin test result mean?
A positive result (induration of 10 mm or more, or 5 mm in immunocompromised individuals or close TB contacts) indicates prior exposure to TB bacteria or vaccination with BCG. It does NOT mean you have active TB disease. A positive TST requires follow-up, typically including a chest X-ray, to rule out active tuberculosis. Your physician will advise on next steps.
Do I need to fast before the TB skin test?
No. There is no fasting required before the TST. You may eat and drink normally. You should avoid applying lotions or creams to the forearm on the day of the injection. When you return for the reading 48–72 hours later, avoid scratching or covering the injection site, as this can affect the result.
How long is a TB skin test result valid?
TST results are generally considered valid for the purpose for which they were done (e.g., employment, school admission). Most institutions accept results that are recent (within 3–12 months depending on policy). Always check with your employer, school, or institution for their specific requirements. Healthcare workers typically require two-step baseline testing on first employment.
Disclaimer: The information on this page is for general guidance only and does not replace a consultation with a qualified physician. TB skin test requirements vary by institution and individual medical history. Please call Saldanha Health Centre to confirm eligibility, pricing, and scheduling before your visit.