Why can't blood be drawn on the same side as an infusion

Infusion therapy is only used when a person's condition is more serious, because the effects of infusion therapy drugs are the fastest. During infusion therapy, intravenous infusion is mainly used. However, when most people receive infusion therapy, the nurse will directly insert the infusion device into their veins for infusion. However, some people have to go through a step before receiving infusion therapy, which is a blood test. So at this time they will inevitably have intentional questions or Why do they need to have a blood test before infusion?

During infusion, due to the dilution effect of the infused fluid and the possibility that the components of the infused fluid may overlap with the items to be tested, it is inaccurate. Blood samples should generally be collected before infusion. Therefore, blood may need to be drawn before infusion.

Of course, this is not necessarily necessary. It depends on what medicine you are taking. Some medicines require blood tests. Also, it depends on what disease you have and what component is missing in your blood.

It is forbidden to draw blood while infusing

It is common that the concentrations of blood sugar, potassium, etc. may be affected due to blood drawing during infusion. It should be stipulated that when an infusion is given in one arm, blood should be drawn from at least the opposite arm to avoid affecting the measurement results of certain items. There are reports that when glucose saline is infused, creatinine, urea, chloride, etc. can be significantly reduced, and blood sugar, uric acid, and potassium can be significantly increased, just like blood sampling from the same side.

Blood drawn during infusion, contamination from liquid components or dilution by the liquid. Due to the extensive connections between the forearm veins, when intravenous infusion is given on one side, blood drawn from the other side may be contaminated. If a multi-hole catheter, such as a multi-hole retention needle, is used, blood may be drawn from another hole other than the infusion hole, which may contaminate the blood specimen and dilute the specimen. The best thing to do is to stop the infusion for a few minutes.

Why do we insert the needle into the vein instead of the artery when drawing blood or giving an infusion?

This makes it easier to insert the needle into the vein. At this time, the artery at the centrifugal end will collapse due to ischemia. Thus, it is not easy to enter the artery. In addition, the pressure inside the arteries is relatively high and the oxygen content is relatively high. If the artery is punctured, the blood will quickly fill the syringe or infusion tube and the color will be bright red.

The blood pressure in veins is lower than that in arteries, and they are easier to insert with a needle. Veins are located shallower, and the walls of the veins are rarely seen on the skin surface. Arteries are round, and the walls are slippery, so the needle is prone to slipping. Moreover, arterial blood transports oxygen to the human body, and drawing blood that causes hypoxia of the limbs and organs can be dangerous.