Why are the blood vessels colorful?

Come to the hospital for examination,

What project are you most familiar with?

Yes, that is—blood draw!

Have you ever wondered:

The top of the blood collection tube is colorful,

Why exactly?

Today, I will take you to tell the difference,

The meaning of different color blood collection tubes.

Colorful blood collection tubes

Actually, the color of the top of each blood collection tube is different to distinguish the items of blood test. The main blood collection tubes have 6 colors: yellow, purple, green, blue, red and gray. , The caps of different colors are also convenient for nurses and sisters to complete blood collection accurately and quickly.

Yellow cap tube

The most commonly used is the yellow cap tube, which is mainly used for syphilis, two and a half, hepatitis C, liver and kidney function, endocrine projects, HIV, insulin detection, etc. The tube contains a coagulant and a separation gel. The function of the separation gel is to separate the serum from the blood clot without affecting each other, mainly to prevent the two from being remixed during transportation.

Purple Cap Tube

Purple head cover tube: generally used for routine blood tests, as well as genetic tests such as carrier screening. The tube is filled with EDTA anticoagulant, which is also to prevent the blood sample from coagulating and facilitate subsequent testing.

Green cap tube

Green cap tube: Generally used for chromosome examination of husband and wife.

Blue cap tube

Blue cap tube: mainly used for the examination of blood coagulation items, including D-dimer determination, antithrombin antigen determination (AT-Ag), plasma prothrombin time determination (PT), activated partial prothrombin time assay (APTT), prothrombin time assay (TT), Fbg fibrin assay, FDP fibrin degradation assay. The tube is filled with 109mmol/L sodium citrate, which can achieve a certain anticoagulation effect when it enters the blood.

Red cap tube

Red capped tube: Mainly used for blood typing. There are no added ingredients in the tube, and the blood can clot naturally.

Grey head cap tube

Gray cap tube: Also known as a blood sugar tube, it contains sodium fluoride and is used when testing fasting blood sugar.

Do I need to fast for blood?

In general, fasting is not required for blood test, however, if your test includes thyroid hormone measurement, blood sugar, fasting is required.

Can frequent blood draws cause anemia?

Some patients worry about the amount of blood drawn, but the amount of blood drawn is directly related to the amount of items you want to check. The blood volume of the general examination is 2~20ml, which will not affect the health of the body (the blood donation volume for adults is 200~400ml, so there is no need to worry about the ordinary blood examination).

What are the precautions after a blood draw?

After blood collection, use three fingers to press the blood collection site and slightly above it to press the bleeding point on the skin surface and the blood vessel wall as a whole, so as to prevent the blood vessel from continuing to bleed. Insist on pressing for 5 minutes, straighten your elbows when pressing, and do not rub while pressing.