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.
An Overview of the TB Test. There are two types of TB (tuberculosis) tests. One is a TB skin test (also known as a PPD test) and the other is a TB blood test (QuantiFERONÂ®-TB Gold). A tuberculosis skin test is a TB test that is often used to detect latent tuberculosis. You can get a skin test at the health department or at your doctor's office.