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CVS is usually performed between 10 and 13 weeks from your last menstrual period. CVS may be chosen over amniocentesis because it may be performed earlier in the pregnancy. Chorionic villus sampling detects chromosome abnormalities (i.e. Down syndrome) and genetic disorders (i.e. cystic fibrosis.).
A needle is used to put the catheter into a vein in your forearm or hand, and then the needle is removed, leaving the catheter in the vein with the hub outside the skin. A regular IV catheter can only stay in for a few days, at most, so if you need to be treated over weeks or months, you will need many IVs. Central venous catheters (CVCs) are also called central venous access devices (CVADs), or central lines. They are used to put medicines, blood products, nutrients, or fluids right into your blood. They can also be used to take out blood for testing. Many different kinds of CVCs are available. The 2 most common types are the port and the PICC line. Why would I need a central venous catheter? Most chemotherapy (chemo) drugs are put right into your bloodstream. Putting needles and catheters in the small veins of your arms or hands repeatedly, can cause wear and tear and scarring in the veins.