Blood can check out a variety of diseases, but before blood test, in order to improve the accuracy of the results, most will require fasting for 8-10 hours, so can you drink water before blood? Let's take a look.
Can you drink water before drawing blood
Whether you can drink water before drawing blood has a lot to do with the items examined.
1. If it is blood routine, then routine, hepatitis B five, Mycoplasma pneumoniae these tests, drinking water is not affected.
2. If it is urine routine, liver function, kidney function, blood lipid, myocardial enzyme test is not allowed to drink water.
It is suggested not to drink water before blood drawing when it is not clear whether the inspection items can drink water.
How long can't you drink water before drawing blood
Do not drink a lot of water within 3-4 hours.
A small amount of drinking water before blood sampling has little effect on the examination results, therefore, the general blood examination will not strictly prohibit drinking water. In order to ensure the accuracy of the test results, do not drink a lot of water within 3-4 hours before the test.
What effect does drinking water have before drawing blood
Blood test generally requires fasting time, and fasting time, water digestion and absorption in the human body is very fast, blood before you drink water will soon be absorbed into the blood, so that the blood will be diluted, the concentration of the detected substances will decline, leading to inaccurate test results.
If you are thirsty before blood test, you can wet your mouth with water, but you are not allowed to drink a lot of water.
Precautions for blood drawing
1. No eating after 8 p.m. the day before.
2. Avoid heavy drinking three days before drawing blood.
3. Don't do strenuous exercise before drawing blood to avoid overwork.
4. Keep warm before drawing blood to avoid catching cold.
5. Don't wear too tight clothes when drawing blood, so as not to affect the blood drawing.