3.1 Infection Prevention Strategies & Standard Precautions

Why infection prevention is core infusion practice

Infection prevention and control is Domain 1B of the CRNI content outline for a reason: every vascular access device (VAD) creates a direct path from the environment into the bloodstream. Infusion nurses interrupt that path at insertion, during every hub access, at dressing change, and by removing devices that are no longer indicated. Exam items often mix technique details with clinical judgment—wrong antiseptic dry time, skipped hub scrub, or an unnecessary central line left in place are classic traps.

Standard precautions vs transmission-based precautions

Standard precautions are the baseline for all patients, all the time. They assume blood and body fluids may be infectious regardless of known diagnosis. Core elements for infusion practice include:

• Hand hygiene before and after patient contact and before aseptic tasks
• Personal protective equipment (PPE) based on anticipated exposure (gloves for blood/body fluid contact; gown and face protection for splash risk)
• Safe injection practices (one needle, one syringe, one patient; never reuse single-dose vials across patients)
• Respiratory hygiene/cough etiquette and appropriate handling of contaminated equipment and linen
• Environmental cleaning of high-touch surfaces in the care area

Transmission-based precautions add contact, droplet, or airborne controls when a specific pathogen or syndrome is known or suspected (for example, C. difficile contact precautions, measles airborne precautions). On the exam, do not treat transmission-based precautions as a substitute for standard precautions—they are additive. A patient on contact precautions still requires hand hygiene and aseptic technique for line care; PPE selection follows both the precaution type and the task.

Hand hygiene: WHO Five Moments and aseptic tasks

The WHO Five Moments for Hand Hygiene map cleanly onto infusion workflows:

1. Before touching a patient
2. Before clean/aseptic procedures (includes catheter insertion, hub access, dressing change, blood culture draw from a line)
3. After body fluid exposure risk
4. After touching a patient
5. After touching patient surroundings (pumps, bed rails, charts that may be contaminated)

Alcohol-based hand rub is preferred when hands are not visibly soiled because it is faster and highly effective against most bacteria and many viruses. Use soap and water when hands are visibly dirty, after caring for patients with spore-forming organisms such as C. difficile, or when institutional policy requires it. Perform hand hygiene immediately before donning sterile gloves for insertion and before accessing a needleless connector—exam scenarios often hide a “I already washed earlier” excuse that fails Moment 2.

Gloves do not replace hand hygiene. Contaminated gloves can inoculate hubs and insertion sites. Remove gloves, perform hand hygiene, then proceed to the next clean task.

PPE in infusion procedures

Match PPE to risk:

• Clean gloves for peripheral IV starts in routine settings, blood draws, and handling potentially contaminated equipment (follow facility policy).
• Sterile gloves as part of sterile field technique for central vascular access device (CVAD) insertion, many implanted port accesses when using sterile technique, and procedures where the gloved hand will contact sterile key parts.
• Gown, mask, and eye protection when splash is reasonably anticipated (e.g., pressurized blood return, irrigation of large wounds near lines).
• For CVAD insertion, maximal sterile barrier precautions typically include cap, mask, sterile gown, sterile gloves, and a full-body sterile drape—not just a small fenestrated towel. This is a high-yield CLABSI prevention point.

Skin antisepsis: agent, coverage, and dry time

For skin preparation before vascular access, >0.5% chlorhexidine gluconate (CHG) in alcohol is preferred when not contraindicated. Alcohol provides rapid kill; CHG provides residual activity. Alternatives (e.g., povidone-iodine, alcohol alone) may be used when CHG is contraindicated, such as documented allergy or manufacturer/age-related restrictions in some neonatal settings—follow current product labeling and facility protocol.

Technique principles the exam expects:

• Cleanse a wide enough area for the intended procedure and dressing footprint.
• Use friction as directed by product instructions (often a back-and-forth scrub for CHG-alcohol applicators).
• Allow the antiseptic to dry completely before needle puncture, catheter advancement, or occlusive dressing placement. Wet antiseptic under a dressing can irritate skin and is associated with inadequate kill; “blow dry” or wipe-off is incorrect.
• Do not recontaminate the field by palpating the prepared site with a non-sterile finger after prep (if re-palpation is required, use sterile technique).

Exam trap: Choosing the correct antiseptic but inserting while the site is still wet, or covering a wet site with a transparent dressing.

Aseptic Non Touch Technique (ANTT) and sterile technique

Aseptic Non Touch Technique (ANTT) is a standardized framework widely used in infusion practice. Core ideas:

• Identify key parts (catheter hubs, needleless connectors, syringe tips, spike ends, sterile dressing contact surfaces) and key sites (insertion site, open wounds).
• Protect key parts and key sites from contamination—never touch them with non-sterile hands or objects.
• Use General ANTT (non-touch + clean technique elements) for many routine line accesses when key parts can be protected without a full sterile field.
• Use Surgical ANTT (sterile gloves, sterile field, sterile supplies) when the procedure risk or exposure of critical sterile surfaces requires it—e.g., CVAD insertion, complex dressing changes with extensive site exposure per policy.

Sterile technique for central access means establishing and maintaining a sterile field, using sterile supplies, maximal barriers at insertion, and sterile gloves. Peripheral short catheters are often inserted with clean technique plus skin antisepsis and non-touch of the catheter that will enter the vein—know your facility’s protocol, but understand that central lines demand a higher barrier standard.

Site selection and device planning to reduce infection risk

Epidemiology strategies are not only “scrub longer.” Risk is engineered by device choice:

• Prefer the least invasive device that meets therapy needs (peripheral over midline over central when clinically appropriate).
• Plan for therapy duration, osmolarity/pH, vesicant status, and infusion frequency so the first device is the right device—multiple failed peripherals and emergency central lines raise infection opportunity.
• For peripherals, prefer sites with lower contamination risk when possible; avoid areas of dermatitis, infection, or heavy joint motion that disrupt dressings when alternatives exist.
• For CVADs, insertion site selection balances infection risk, mechanical risk, and operator expertise (e.g., subclavian vs internal jugular vs femoral considerations in adults—femoral sites often carry higher infection risk in many adult populations).
• Use ultrasound and skilled inserters to reduce attempts and tissue trauma when indicated.

Daily necessity review is prevention: if a CVAD is no longer needed, plan prompt removal. The safest central line is the one that is not there.

Putting strategies into a practical sequence

A high-reliability peripheral start sequence illustrates integration: hand hygiene → gather supplies → explain procedure → apply tourniquet and select vein → release tourniquet → hand hygiene → don gloves → skin antisepsis with full dry time → reapply tourniquet without contaminating site → insert without touching the prepared path → stabilize, flush, secure, dress → document and educate. For CVAD insertion, expand barriers to maximal sterile precautions, use CHG skin prep with dry time, and maintain sterile field integrity throughout.

Bundle thinking applies beyond CLABSI: hand hygiene, correct prep, non-touch of key parts, securement that protects the site, and timely removal work together. Single perfect steps fail if the next step recontaminates the hub.

Exam traps to memorize

• Gloves instead of hand hygiene before aseptic tasks
• Inadequate hub disinfection (“quick wipe” vs manufacturer/protocol scrub and dry)
• Inserting or dressing before antiseptic is dry
• Using clean technique only for a procedure that requires sterile/maximal barriers
• Leaving an unused multi-lumen CVC “just in case” for days
• Choosing a large central device when a peripheral or midline would safely complete a short therapy

Master these strategies and you will connect cleanly to chain-of-infection logic, CLABSI bundles, and phlebitis prevention in the next sections.