It comes pre-mixed in 1-gallon pails, so the color and consistency is perfect every time. Coverage with a Â¼ grout line is approximately 50 sq. ft. for a 12 x12 application. See chart for additional information regarding grout coverage per gallon.
In brief: 48 to 72 hours. The actual placement of the TB skin test (PPD) only takes a few seconds and should be painless. However you need to return to the clinic to have the skin test read by someone who knows what they are looking for between 48 and 72 hours later. In brief: 48 to 72 hours.
A positive response to a TB skin test does not mean that you have active TB. Rather it means that you have been exposed to TB and need further evaluation. A TB test is performed by injecting a small amount of fluid that contains components of the TB organism under the skin. If a patient has been exposed to TB before or has received the BCG vaccine, the patient will react to the injection by forming a hard, raised area at the injection site.