Does mid-term Tang screening require fasting?
Midterm screening is a prenatal examination performed by pregnant women between 16 and 20 weeks of pregnancy. It can assess whether the fetus has the risk of chromosomal abnormalities and is crucial to the health of pregnant women and fetuses. So, does mid-term Tang screening require fasting? The following explains in detail from many aspects.
Aspect 1: Laboratory preparation
Mid-term Tang screening requires blood drawing for laboratory examination. In order to ensure the accuracy of the examination, the required laboratory materials and equipment need to be prepared. Before drawing blood, the laboratory doctor needs to conduct relevant examinations on the patient, such as physical signs, medication use, etc. Therefore, it is recommended to fast for 4-6 hours before coming to the hospital.
In addition, being too full or too hungry may affect the test results, so it is recommended that patients eat less or control their diet the night before to maintain a normal sense of hunger and satiety.
Aspect 2: Check the accuracy of the results
Mid-trimester screening is an important prenatal examination, and the accuracy of the examination results is directly related to the health of pregnant women and fetuses. Before blood drawing, if pregnant women eat too much, it will cause an increase in insulin in the blood, leading to abnormal Tang screening indicators, which will affect the accuracy of the test results. Therefore, it is recommended to keep an empty stomach before drawing blood.
In addition, some drugs may also affect the test results, such as diazepam, chloral hydrate, etc. You need to inform your doctor and stop taking the drugs before the test.
Aspect 3: Preoperative preparation
During mid-trimester screening, placentacentesis or amniocentesis is required for pregnant women with large pregnancies or suspected fetal development abnormalities. In order to ensure the safety of the operation, preoperative preparation is required.
Fasting is one of the basic requirements for surgery. A fasting state can reduce gastrointestinal reactions during surgery and relieve postoperative nausea and vomiting and other uncomfortable symptoms. Therefore, you need to keep fasting for 6-8 hours during this type of preoperative preparation.
Aspect 4: Things to note
Second trimester screening requires fasting, but for the health of pregnant women, the following matters need to be paid attention to:
1. The fasting time should not be too long, as excessive fasting can cause symptoms such as hypoglycemia and weakness;
2. If a pregnant woman feels dizzy, fatigued and other symptoms before blood drawing, she needs to seek medical treatment in time;
3. Disinfection and bandaging are required after venous blood extraction to reduce the risk of infection.
Summary
Mid-trimester screening is one of the important prenatal examinations for pregnant women and needs to be conducted under the guidance of a doctor. It is necessary to keep an empty stomach before drawing blood to ensure the accuracy of the test results. At the same time, attention should be paid to issues such as fasting time not being too long and surgical safety. It is recommended that pregnant women go to the hospital for detailed consultation before the examination to accurately understand the examination requirements and precautions.
