Nursing care
Peripheral IV insertion steps: where errors happen and how to respond
Written and reviewed by Nicole Ramirez, BSN, RN, CMSRN · 4 min read · Updated November 2026
Short answer
IV insertion steps in nursing: confirm the order and patient, perform hand hygiene, choose a distal upper-extremity vein away from joints, apply the tourniquet, clean with antiseptic and let it dry, insert at a shallow angle, watch for flashback, advance the catheter off the needle, release the tourniquet, flush, then secure, dress, label and document the site.
Purpose and choosing the site
A peripheral IV gives fluids and medicines and allows repeated blood sampling. MSD Manuals prefers upper-extremity sites because they last longer and cause fewer complications, and advises starting with distal veins and moving up the arm as sites are used, so a failed attempt does not spoil the vein below it. Avoid veins over joints where possible.
Some arms are poor choices, and exam items test them. MSD lists relative contraindications: an arm with an arteriovenous fistula or graft, the side of a mastectomy or lymph node dissection, burned or infected skin, a badly swollen or injured limb, and a vein that is already inflamed or clotted. Very irritating solutions such as parenteral nutrition may need a different type of line.
Critical steps where errors happen
Skin prep is the step most often rushed. Clean with chlorhexidine or povidone-iodine and let it dry completely, as MSD advises, because wet antiseptic has not finished working. Insert at 10 to 30 degrees, about 1 to 2 cm below the planned entry point. When dark red blood appears in the flash chamber, advance a little further, then slide the catheter off the needle into the vein.
The most dangerous error is pushing the needle back into a catheter already in the vein, or pulling the catheter back over the needle. MSD warns against both because the needle can shear off a piece of catheter, which then travels as an embolus. If an attempt fails, remove both and start again with a new catheter. Release the tourniquet before flushing or connecting the infusion.
Complications and the nursing response
MSD lists infiltration and extravasation, hematoma, thrombophlebitis, local infection, air embolism and catheter embolism. Swelling, coolness or pain around the site with a slowing infusion suggests fluid outside the vein: stop the infusion, remove the catheter per policy and elevate the limb. A vesicant drug leaking out needs the facility extravasation protocol and prompt reporting.
Redness, warmth and a tender, cord-like vein point to phlebitis; remove the catheter and restart in another site. Management of each complication is covered on the peripheral IV complications page. Prevention is routine work: assess the site regularly, keep the dressing clean and intact, and remove a catheter that is no longer needed. MSD advises replacing or removing catheters within 72 hours, and facility policy sets the exact interval.
Attempt limits, gauge and documentation
Repeated sticks hurt, delay treatment and use up veins. Infusion Nurses Society standards, as summarized by Infection Control Today, recommend no more than two attempts by any one nurse and no more than four attempts in total. After two misses, the correct move is to escalate to a more experienced clinician or the vascular access team rather than keep trying.
Gauge depends on the purpose: MSD lists 18 to 20 gauge for routine adult infusions, 14 to 16 for high-volume needs and 22 to 24 for infants and children. Document the date and time, gauge, site, number of attempts, the flush result and how the patient tolerated it. MSD also advises writing the insertion date and time on the dressing itself.
Hypothetical practice scenario
Hypothetical scenario, not a real exam item: a client who had a left mastectomy with lymph node removal needs IV access. The nurse chooses a right forearm vein, and on the second attempt the catheter will not thread. What should the nurse do next: try the left arm, make a third attempt in the right hand, or ask a more skilled colleague?
Asking a more skilled colleague is correct, because two attempts by one nurse is the usual limit and the left arm is on the mastectomy side. A third attempt appeals because the vein looked good, but it adds pain and can damage a vein another clinician could use. Pulling the needle back and re-advancing it into the catheter is also wrong because of shearing.
Sources and further reading
MSD Manual Professional Version: How To Insert a Peripheral Intravenous Catheter. Indications, relative contraindications, upper-extremity and distal-first site selection, antiseptic drying, 10 to 30 degree angle, flashback, catheter shear warning, gauge ranges, complications, 72-hour replacement, labeling the dressing.
Infection Control Today: Five Key Takeaways from the New 2016 Infusion Therapy Standards of Practice. Infusion Nurses Society recommendation of no more than two peripheral IV attempts per nurse and four in total.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our fundamentals practice questions are the closest set to what this page covers.
Common questions
What gauge IV for blood transfusion?
Use the size your facility's transfusion policy specifies. MSD lists 18 to 20 gauge as the routine adult range and 14 to 16 gauge when large volumes must go in quickly, so rapid transfusion calls for the larger end. Infants and children usually need 22 to 24 gauge.
Where should the nurse start an IV first?
Start distally on an upper extremity, such as the hand or lower forearm, and move toward the elbow if more attempts are needed. Choose a straight vein away from joints, and avoid an arm with a fistula, a mastectomy on that side, infection or heavy swelling.
How many IV attempts are allowed?
Infusion Nurses Society standards recommend no more than two attempts per nurse and four in total. After two unsuccessful attempts, escalate to a clinician with more skill, such as a vascular access team, instead of continuing.
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