In the Tuberculin Skin Test (TST) protocol conducted by Hypro Diagnostics, a volume of 0.1 ml of purified protein derivative (PPD) sourced from the Razi vaccine and serum research institute in Iran is administered intradermally into the volar aspect of the forearm. This injection is standardized to deliver five tuberculin units of the PPD solution. Subsequently, the average vertical and transverse induration diameters are measured precisely 72 hours post-injection. Induration refers to the raised and hardened region around the injection site. The TST is deemed positive if the induration measures 10 mm or more, indicating a delayed-type hypersensitivity response and potential exposure to the tuberculosis (TB) bacterium. It’s important to note that the interpretation criteria for a positive TST result may be subject to variations influenced by factors such as individual risk, age, and the prevalence of TB in the specific population. Hypro Diagnostics, along with healthcare professionals, typically provides tailored guidelines for interpretation, ensuring accurate assessment and appropriate follow-up procedures.
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