How long before the建档 examination should one refrain from eating?
Feb 21, 2025
Source: Cainiu Health
Dr. Shen Yonghua
Introduction
It is usually required to fast for 6 to 8 hours before undergoing建档 examination (health record establishment examination), during which no food or drink should be consumed. This is to ensure that blood collection and other related examinations are conducted under fasting conditions, thereby maintaining the quality of the blood sample and guaranteeing the accuracy of the screening results. Fasting for 6 to 8 hours before the examination is necessary, which means avoiding food and water after the previous evening's meal until the examination is completed the next morning.
Generally, you need to fast for 6-8 hours before undergoing medical examinations for establishing a health record. This ensures related tests such as blood draws are conducted under fasting conditions, maintaining optimal blood condition and ensuring accurate screening results. The analysis is as follows:
You should fast for 6-8 hours before the health record examination. This means avoiding food and drink (except water) from after the previous evening's dinner until the test the next morning. After eating, components from food enter the bloodstream, altering blood composition and concentration, which may interfere with the accuracy of the test results. Therefore, testing under fasting conditions is necessary.
Complete blood count (CBC) and routine urine tests are generally unaffected by food intake. However, during prenatal health record examinations, testing under fasting conditions is still recommended to comprehensively assess the pregnant woman's physical condition. Liver and kidney function tests, and blood glucose measurements have strict fasting requirements. After eating, liver and kidney functions and blood glucose levels can be significantly altered, failing to reflect the body's true physiological status. Therefore, these tests must be conducted under fasting conditions.
From after the previous evening's dinner until the examination the next morning, you should avoid eating and drinking. During the fasting period, ensure adequate sleep, avoid staying up late and excessive fatigue, to maintain good physical condition. If a pregnant woman needs to undergo prolonged testing while fasting, she may carry some food or drinks to replenish energy promptly after completing the tests.
