Which examinations require an empty stomach? Not paying attention may affect the inspection results!
At the hospital, in order to clarify the cause of the disease, the patient will inevitably have to undergo an examination. However, in the face of a wide range of examinations, the patient will start to wonder: Is it necessary to have an empty stomach for blood routine? Can I eat before the ultrasound examination?
Items that generally require fasting examination include: abdominal ultrasound, CT, MRI, renal artery ultrasound, gastroscopy, colonoscopy, CT, MRI, etc. that need to be enhanced, as well as blood tests, such as fasting blood glucose, liver function, kidney function, electrolytes , Blood lipids, various infection markers, tumor markers, hormone levels, etc.
The reason for fasting is to get a more accurate diagnosis. As far as blood tests are concerned, the body is in a basal metabolic state when fasting, which can eliminate the influence of diet and other factors. The reference range of some test results is the range value of fasting. If it is not in the fasting state, it will lose its reference significance. In addition, some people's blood will appear chylous after eating, which affects the test results.
As for other examinations, abdominal ultrasound, CT, and MRI require fasting because the gallbladder can only be clearly displayed when it is full. After eating, the gallbladder will shrink and thicken the gallbladder wall, which affects the examination results and even leads to misdiagnosis.
Gastroscopes and colonoscopy require fasting because food residues will cover the ulcer surface and mucosa, affecting observation, while milk, coffee, juice and other substances will change the color of the mucosa.
Of course, not all examinations require fasting: X-rays of various parts, non-enhanced and non-abdominal MRI, CT, breast ultrasound, neck and cerebrovascular ultrasound, upper and lower extremity arteriovenous ultrasound, cardiac ultrasound, electrocardiogram, etc. There is no need to fast or water.
