Who knows who PPD is. I often see people say

Hello, PPD is a tuberculin test, which is a laboratory test for tuberculosis diseases such as pulmonary tuberculosis.

Tuberculin test. The pure protein derivative (PPD) of the nodin is specifically designed to examine tuberculosis. It is based on ammonium sulfate as a precipitate to extract binding proteins, which is relatively pure and does not produce non-specific reactions.

PPD made in Denmark is called PPD-RT, and PPD is made from human tuberculosis bacteria in China as PPD-C, and BCG-PPD is made from BCG vaccine, containing 5IU, which is often used for clinical diagnosis.

Test method: PPD-C 5IU (injected into the epidermal junction of the upper middle third of the flexor side of the left forearm to form a dermatom locally. The reaction was observed 72 hours after injection, and the judgment result was based on the diameter of the local induration

5 mm is negative (-), 5 9 mm is generally positive (+), 10 19 mm is moderately positive (++20 mm or less than 20 mm, but with blisters or necrosis is strong positive (++

A positive tuberculin test only indicates tuberculosis infection, but it does not necessarily mean disease. If it is negative, it means that it has not been vaccinated or has expired, and it should continue to be vaccinated; According to the induration, first determine what category you belong to, and then go to the hospital to take a film to see if there is a lesion, and then carry out **.

The PPD test is to inject PPD instead of OT (tuberculin) into the skin of the human forearm, and observe the reaction for 72 hours, which is to check whether the body has been infected by tuberculosis bacteria and develop immunity. It is an early auxiliary diagnostic method to determine whether tuberculosis is present. The principle is the same as the OT test.

It's not a disease!

1. Meaning: potentiometer positioning device is the abbreviation of the above three English scum words.

2. PPD positioning technology is a kind of GRAT control valve company invented in 2010 for the positioning device of mechanical and electrical components of industrial automation process control devices (electric actuators, electric actuators, electric control valves, etc.). Belongs:

Long life, high positioning accuracy, simple debugging of a new technology cracking.

PPD positioning technology.

Overview of Positioning Technology Meaning: Potentiometer positioning device is an abbreviation of the above three English words. PPD positioning technology is a kind of positioning device utility model patented technology for the mechanical and electrical components of industrial automation process control devices (electric actuators, electric actuators, electric control valves, etc.).

It is a new technology with long life, high positioning accuracy and simple debugging.