Fluid retention is a clinical manifestation in patients with multiple organ failure and acute myocardial infarction, among others. When fluid retention is suspected and you don’t know what tests should be done, I believe it is something that troubles many people. To help alleviate your worries, the following is an overview of what tests are needed for ulcers with a worm-like appearance. What tests are needed for body fluid retention? Blood biochemistry: Blood is a bright red liquid filled in the blood vessels of the body, in which there are many different substances in addition to the blood cells. Testing the amount of various ions, sugars, lipids, proteins, as well as various enzymes, hormones and many metabolites of the body present in the blood is called blood biochemistry test. Electrolytes: Electrolytes that do not completely ionize ions in aqueous solution or molten state are called weak electrolytes. Weak electrolytes include weak acids, weak bases, water and a few salts. Electrocardiogram: Electrocardiogram (ECG or EKG) is a technique that uses an electrocardiogram machine to record from the body surface a graphical representation of the changes in electrical activity produced by each cardiac cycle of the heart. X-ray examination: A method of diagnosing disease with X-rays. There are general examinations, special examinations and contrast examinations. Fluoroscopy is a simple and commonly used examination method to observe the morphological and functional changes of organs from different angles. CT examination: CT examination is based on the different absorption and transmission rates of X-rays by different tissues of the human body, and the application of highly sensitive instruments to measure the human body, and then input the data obtained from the measurement into the electronic computer, which can take a cross-sectional or three-dimensional image of the examined part of the human body after processing the data, and find small lesions in any part of the body. Ultrasound examination: Ultrasound examination is a method of diagnosing diseases by using the waves generated by ultrasound to propagate in the human body and displaying the reflection and attenuation patterns of various organs and tissues in the body to ultrasound through the oscilloscope.