Tuberculosis (TB) Skin-test Clinic

A TB skin test is used to screen for Tuberculosis. A TB skin test will indicate if you have been exposed to TB (if the germ is in your body). It can not tell if you have active or inactive TB.

If the skin test shows that the TB germ is in your body, more testing will need to be done to determine if you have active TB disease.

skin testing with needleRegion of Waterloo Public Health offers TB skin testing clinics weekly in Waterloo (99 Regina Street South, 2nd floor) and once a month in Cambridge (150 Main Street).

Please call 519-575-4400 to make an appointment. Please plan ahead - clinics fill up quickly. 

You can also check the TB Skin Test Providers document if you are interested in information about other service providers.

Conestoga College and
McMaster University Students (Conestoga Campus)

Conestoga College offers TB skin testing for these students only. Students can find all of the clinic information on in the Practicum Services Community section or by calling Practicum Services at 519-748-5220 ext. 3101.

If you are a Conestoga or McMaster (Conestoga Campus) student, please make every attempt possible to book an appointment at one of these clinics before booking with Public Health.

Clinic details

Location Cambridge Waterloo
Address 150 Main Street 99 Regina St. 2nd floor
Frequency Once per month Every week
Days of Operation

Monday - test placement

Wednesday - test reading

Tuesday - test placement

Thursday - test reading

Payment Options Debit, credit or cash  Debit, credit or cash

Testing fee

The fee for a non-publicly funded TB skin test is $25 per step ($50 total for a two-step test).

Non-publicly funded TB skin tests include testing required for employment, volunteer placements, and for those under age 65 entering a retirement home.

TB skin tests are publicly funded (no fee) for the following individuals:

  • Contacts of an active case of TB
  • Medically indicated individuals that are at an increased risk of developing active TB
  • Individuals requiring admission to treatment rehabilitation centres
  • Resident admissions to Long-Term Care facilities
  • **NEW** Students when required for educational purposes by any student of any educational institution

Important information about your TB Skin Test

  • The test is placed one day and must be read 48 hours later at approximately the same time of day (i.e. If the test is placed at 9:00am on Tuesday, you must return at 9:00 am on Thursday for reading)
  • If a person has a documented positive TB skin test, the test will not be repeated
  • For two-step testing: if you do not attend your first step appointment, the second step appointment will be cancelled
  • If you require immunization for measles, mumps and rubella (MMR), please tell the nurse at your first TB skin testing appointment
  • If you have been immunized with a live vaccine (e.g. measles/mumps/rubella; chickenpox; yellow fever), you must wait four weeks before having a TB skin test

One-step vs. Two-step TB skin tests

A one step TB skin test means that a test is placed and read 48 hours later to determine if you have been exposed to TB.

A two step test means that an initial test is placed and read (in the 48 hour timeframe) to establish a baseline. If the initial test is positive, no further testing is completed. If the test is negative, a second test is performed 1-4 weeks after the initial test and again read 48 hours later. If a person has a documented two-step test, an additional two-step test never needs to be repeated.

Two-step testing may be recommended for:

  • People who require subsequent testing e.g. health care workers, correctional workers
  • Residents or staff of a long term care facility
  • People originating from countries with high prevalence of Tuberculosis
  • Individuals undergoing medical investigation
Check your paperwork if you do not know if you need a one-step or a two-step test. Alternatively you can call to check with the organization requiring the test.

For information about TB or the TB skin test, clinic hours, etc., please check our Tuberculosis page.