Ewalda Chemical Test

Ewald's chemical test is a method developed by the German physician S. A. Ewald in 1885 to determine the presence or absence of pulmonary tuberculosis. This method is one of the first methods for diagnosing tuberculosis and is still used in clinical practice.

The essence of the method is that a drop of silver nitrate solution is applied to the surface of the skin of a patient with tuberculosis, which, in the presence of tuberculosis, causes the formation of a cheesy coating. If no changes form on the skin, this indicates the absence of tuberculosis.

The Ewald chemical test has a number of advantages over other methods for diagnosing tuberculosis, such as the Mantoux tuberculin test or the Pirquet skin test. Firstly, it is more sensitive and can detect even small foci of tuberculosis. Secondly, it is less invasive and does not require the introduction of tuberculin or other substances into the patient’s body. Thirdly, it can be used to diagnose tuberculosis in children and pregnant women for whom other diagnostic methods are contraindicated.

Despite its advantages, the Ewald test also has disadvantages. For example, it may give false positive results for some skin conditions such as psoriasis or eczema. In addition, it cannot be used to diagnose tuberculosis of the intrathoracic lymph nodes, since this method does not detect the characteristic cheesy coating.

Overall, the Ewald chemical test is an important method for diagnosing pulmonary tuberculosis, which is still widely used in clinical practice due to its sensitivity and safety.

Ewald Chemical Test: Fundamentals and Applications in Medicine

The Ewald chemical test, named after the German physician Ewald, is a diagnostic tool used in medicine to evaluate the presence of certain chemical compounds in a patient's body. This test was developed by Ewald at the end of the 19th century and became an important tool for detecting and studying various diseases.

The sampling principle is based on the use of reactions between certain chemicals and biological samples, such as the patient's blood, urine or saliva. The chemical reactions that occur as a result of the sample allow doctors to obtain information about the patient’s health status and identify the presence or absence of certain pathological processes.

There are several different variations of chemical testing, each of which is aimed at identifying specific chemical compounds or body conditions. Some of the most common tests include testing blood glucose levels to diagnose diabetes, testing for protein in the urine, which can indicate kidney problems, and tests for infections that use antibodies or antigens in biological samples.

The advantages of the chemical sample ewald are its relative simplicity, low cost, and the ability to quickly obtain results. It can be performed by doctors in a clinical environment or even at home using special test kits. This makes the sample accessible and convenient for use in a variety of medical settings and situations.

However, it should be noted that the results of a chemical test are usually preliminary and require confirmation using other diagnostic methods. A positive test result may indicate the presence of a pathological process, but further evaluation and analysis is required to make a definitive diagnosis.

In conclusion, the Ewald chemical test is an important tool in medicine for diagnosing and monitoring various diseases. Due to its simplicity and accessibility, it is widely used in clinical practice and allows doctors to quickly obtain information about the patient’s health status. However, test results always require confirmation through additional tests and consultation with a medical specialist.