In medicine and statistics, gold standard test is usually diagnostic test or benchmark that is the best available under reasonable conditions. Other times, gold standard is the most accurate test possible without restrictions. Both meanings are different because for example, in medicine, dealing with conditions that would require an autopsy to have a perfect diagnosis, the gold standard test would be the best one that keeps the patient alive instead of the autopsy.
Youâll use intermediate strength (5 T.U.) PPD in a tuberculin syringe that has a 1/2-inch, 26- or 27-gauge needle. Make sure the bevel edge of the needle is facing up, and insert the needle beneath the skin (Figure 1).ouâll use intermediate strength (5 T.U.) PPD in a tuberculin syringe that has a 1/2-inch, 26- or 27-gauge needle. Make sure the bevel edge of the needle is facing up, and insert the needle beneath the skin (Figure 1).
Skin testing (PPD) for tuberculosis (TB) is available at the public health department. Testing is available Monday, Wednesday, and Friday between noon and 4:30 pm by appointment. Clients receiving a TB test must return to the public health department within 48-72 hours to have the test results checked.kin testing (PPD) for tuberculosis (TB) is available at the public health department. Testing is available Monday, Wednesday, and Friday between noon and 4:30 pm by appointment. Clients receiving a TB test must return to the public health department within 48-72 hours to have the test results checked.