Fehling's test (Fehling S Test)

The Fehling test is a test to detect the presence of sugar in the urine. It has now been replaced by better and simpler testing methods.

The Fehling test uses Fehling's solution, which consists of two components:

1. The first component (Fehling's I) is a solution of copper sulfate.

2. The second component (Fehling's II) is a solution of potassium sodium tartrate and a solution of sodium hydroxide.

Test procedure:

1. Boiling Fehling's solution is added to an equal amount of boiling urine.

2. The yellowish or brownish color of this mixture indicates the presence of sugar in the urine.

Thus, the Fehling test allows you to determine the presence of sugar in the urine, but it has now been replaced by more modern methods of analysis, since it is not highly accurate and requires complex preparation of reagents.

The Fehling test is one of the oldest and simplest methods for determining the presence of sugar in urine, which is still used in medical practice. This method was proposed in 1860 by the German physician and chemist Hermann Fechlinger.

To carry out the Fehling test, you need to prepare a special solution, which consists of two components. The first component is a solution of copper sulfate (Fehling’s I), the second component is a solution of potassium-sodium tartrate and sodium hydroxide solution (Fehling’s II).

When the solution is ready, it must be added to the boiling urine solution in equal proportions. If sugar is present in the urine, the reaction results in the formation of a yellow or brown precipitate. Based on this, we can conclude that sugar is present.

However, there are now better and simpler testing methods, such as a urine glucose test (dipstick) or a blood glucose test. These methods are more accurate and easier to use, but may be less available in some regions.

However, the Fehling test continues to be used in some countries, especially in developing regions where access to more modern testing methods may be limited. In addition, this test may be useful in assessing the effectiveness of treatment for diabetes or other diseases associated with high blood glucose levels.

Thus, the Fehling test is a simple and accessible method for determining the presence of glucose in urine, but it cannot completely replace more modern and accurate testing methods.

Test Fehling

The Fehling test is one of the oldest methods for determining glucose in urine; it was discovered in 1917 by the German chemist Johannes Fehling. However, at present this method is outdated and cannot be considered as a method used to control sugar