2-Step TB Skin Test (PPD / TST)

Tuberculosis (TB) Testing for School, Healthcare & Employment Clearance

Need TB testing for school or work?
The 2-Step TB Skin Test (PPD / Mantoux TST) is used to determine whether you have been exposed to tuberculosis (TB) and is commonly required for healthcare workers, students, and employment clearance.

✔ Standard TB screening method
✔ Required for many healthcare programs & jobs
✔ Used for baseline (initial) TB testing

⏱ Typical turnaround: results are usually emailed in 2–4 days.

💡 Consider a TB Blood Test (Better Option for Many)

Many schools, hospitals, and employers accept a TB blood test (IGRA) instead of a 2-step TB skin test.

👉 Always check with your organization first

Why Choose a TB Blood Test?

✅ One visit only (no return trips)
✅ No 48–72 hour reading required
✅ Not affected by BCG vaccination
✅ More convenient for busy schedules
✅ Faster and easier compliance

👉 For most people, the TB blood test is the easiest and most efficient option

What Is a 2-Step TB Test?

The 2-step TB test helps detect latent TB infection more accurately during initial screening.

👉 Some individuals with past TB exposure may have a false-negative first test

📌 The first test may “boost” the immune response, making the second test more accurate

How the TB Skin Test Is Performed

• A small amount (0.1 mL PPD) is injected under the skin of the forearm
• A small raised bump (wheal, 6–10 mm) should appear
• This is an intradermal injection

⏱️ Important: Multiple Visits Required

This test requires 4 visits total:

Step 1

1. TB test placed
2. Return in 48–72 hours for reading

👉 If negative, proceed to Step 2

Step 2 (1–3 weeks later)

3. Second TB test placed
4. Return again in 48–72 hours for final reading

Understanding Your Results

👉 Positive result

• Raised, firm swelling at the injection site
• May indicate TB exposure
• Requires further evaluation (e.g., chest X-ray)

👉 Negative result

• No significant reaction
• Likely no TB infection

📌 Interpretation depends on size of reaction, health status, and risk factors

Why 2-Step Testing Matters

• Detects latent TB infections more accurately
• Prevents false negatives in previously exposed individuals
• Required for baseline testing in some healthcare settings

⚠️ Important Considerations

BCG Vaccination

• Prior BCG vaccination may cause false-positive results
• TB blood tests (IGRA) are NOT affected by BCG

Factors That May Affect Results

A TB skin test may be inaccurate if you:

• Recently received a live vaccine (MMR, Varicella, Flu)
• Had a recent viral infection
• Have a weakened immune system
• Are taking immunosuppressive medications

📌 Recommended: Wait 4–6 weeks after live vaccines before testing

Who Needs a 2-Step TB Test?

• Healthcare workers & hospital staff
• Nursing & medical students
• Individuals requiring baseline TB screening
• Employees in regulated or high-risk environments

Why Choose This Test?

✅ Widely accepted for school & employment requirements
✅ Standard baseline TB screening method
✅ Helps detect latent TB infections

Important Information

• Requires multiple visits—plan accordingly
• Many organizations accept TB blood tests instead—check first
• This test is for screening only (not diagnosis)
• Positive results require follow-up evaluation

Get Your TB Testing Completed

Choose the option that works best for you. Avoid delays. Stay compliant.

👉 Schedule your 2-Step TB Skin Test or choose a TB Blood Test today

***ONLY OCCUPATIONAL CLINIC LOCATIONS PROVIDE TB SKIN TEST*** 

TB Skin Test Clinic Locations