Learn about the whys of the laboratory department

Mondo Health Updated on 2024-02-19

2024 Book of Answers

1.Why do I have to go on an empty stomach to draw blood? Does drinking water count as an empty stomach?

When blood is drawn in the hospital, we are often asked, "Didn't you eat wow?" Some people replied, "I didn't eat, I ate a bowl of noodles", and some were too "strict" and said "I didn't drink a sip of water". Fasting blood collection refers to fasting after 8 hours of fasting.

2.Why do others draw one tube of blood, why do I draw eight tubes of blood? Can you stop pumping so much of my blood, I'm anemic!

The amount of blood drawn by each person should be determined according to the test items, and the doctor will prescribe the test items according to each person's own situation, and the test items will be different, and the amount of blood required will naturally be different. The different color of each tube also means that the anticoagulant components in it are different, and the corresponding items are also different, and the amount of blood used to draw blood will not cause anemia for the human body, as long as the human hematopoietic function is normal, it will recover soon. So, don't worry too much!

3.Why can't I test stool on diapers or paper towels?

Because diapers and tissues are absorbent, and they are often mixed with infant urine, this will affect the analysis of pathological components such as red blood cells and pus cells in the stool. Under special circumstances, the child is in serious condition, and the feces on the diapers are more and fresh, and the part with mucus or pus and blood can be picked up and sent for testing.

4.Why did I get the blood drawn first but the results were not forthcoming?

Usually after the blood is collected, the doctor will inform the patient of the time when the results will be taken. Due to the different test items, the detection methods and equipment are also different, so the reporting time of the results is different for different test items, even if the specimens are collected at the same time. For example, routine blood tests usually report results within 30 minutes, while biochemistry and immunology programs take longer to produce results.

5.Why do my hands get bruised or bulging after the blood is drawn, is it because the doctor is not skilled?

Because the vein is drawn not only to puncture the surface, but also to penetrate the vein, the eye of the needle on the surface is not necessarily at the same point as the eye of the needle on the blood vessel wall. When pressing, only one finger is used to press the bleeding point on the surface of the **, and the bleeding point on the blood vessel is not effectively pressed, and the bleeding point on the blood vessel may be oozing and bruising. After the blood is drawn, because the bleeding continues at the eye of the blood vessel needle, you can press the blood drawing place with three fingers for 3 5 minutes, and press the bleeding point on the surface and the blood vessel wall as a whole to avoid the blood vessel from continuing to bleed. However, it is important not to rub it when pressing, as light rubbing will accelerate bleeding and cause subcutaneous bruising.

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