What is the 6 needle injection?
Photo Credit: Courtesy of 3DStockPhoto (injection image)
The needle points were dipped in tuberculin purified protein derivative (PPD) and pricked into the skin. A Heaf gun with disposable single-use heads was recommended. The gun injected PPD equivalent to 100,000 units per ml to the skin over the flexor surface of the left forearm in a circular pattern of six.