Contrast examination For structures or organs lacking natural contrast, substances above or below the structure or organ may be introduced into the organ or shared mesh space, so that contrast is developed for imaging examination, and the introduced substance is called angiography. Agent or contrast agent. Most of the contrast agents contain iodine, and those with iodine allergies should pay attention.

Basic Information

Specialist classification: growth and development check classification: X-ray

Applicable gender: whether men and women apply fasting: not fasting

Tips: Check your relaxation, face it positively, and actively cooperate with the inspection. Normal value

1 renal excretion of contrast agents, mostly for urinary and cardiovascular angiography.

2 contrast agent excreted by the liver and gallbladder, such as transcaloric acid.

3 oil-based contrast agents, such as iodized oil, iodophenyl ester, etc., mainly used for bronchoscopy, uterus and other channels, body cavity and other angiography.

4 solid contrast agent, such as barium sulfate, is adjusted into a suspension swallow or enema for gastrointestinal angiography. The density of the above four types of contrast agents are higher than that of human soft tissues, collectively referred to as positive contrast agents, and white on X-ray films.

5 gas contrast agents, such as air, carbon dioxide, oxygen, etc., such contrast agent density is lower than human soft tissue, is a negative contrast agent, black on the X-ray film.

Clinical significance

There are many types of angiography, which can be divided into bronchography, barium enema examination, oral gallbladder angiography, gastrointestinal barium meal angiography, intravenous urography, hysterosalpingography, transcutaneous biliary angiography, cardiac and angiography. Contrast examination is to introduce a substance with higher or lower density than the human body into the part to be inspected in the human body, artificially causing the difference in the density of the part to be inspected to form a contrast for the purpose of diagnosis.


Before the test: a contrast agent allergy test is required. Fasting and cleaning the intestines.

At the time of examination: cooperate with the doctor to eliminate the patient's concerns and allow them to be examined under good psychological conditions. Strictly implement the principle of aseptic operation.

Inspection process

Prepare adequate precautions and preventive measures before inspection. Strictly grasp the precautions for preparation and use. The factors are the basis for ensuring the smooth completion of the inspection; actively communicate during the inspection, do a good job of comforting and explaining the work, and eliminate the patient's concerns. Checked under good psychological state. Strictly implement the principle of aseptic operation, familiar with the inspection steps and the close cooperation of medical care, so that the inspection is completed satisfactorily. Strengthen patient observation and deal with adverse reactions in a timely manner.

Not suitable for the crowd

Bronchial angiography, in the recent (about 20 days) there are a large number of hemoptysis, active tuberculosis, cardiopulmonary insufficiency, iodine allergy, sulfa allergy. Intestinal examination of sputum, suspected colon necrosis is prohibited. Oral cholecystography, severe liver and kidney dysfunction and severe jaundice are not suitable for this examination. Gastrointestinal barium meal imaging, suspected gastrointestinal perforation, banned sputum for gastrointestinal examination, but need to use other water-soluble contrast agents.

Adverse reactions and risks

No complications.