Element IV. Selecting and Using Barriers and PPE to Prevent Contact with Infectious Material

Element IV works from two precise definitions taken directly from the New York syllabus. Personal protective equipment (PPE) is specialized clothing or equipment worn by an employee for protection against a hazard. Barriers are equipment such as gloves, gowns, aprons, masks, or protective eyewear which, when worn, can reduce the risk of exposure of the health care worker's skin or mucous membranes to potentially infective materials. The two ideas overlap: every barrier the syllabus names is a form of PPE, and PPE is the broader legal category used in workplace safety law.

PPE is never the first line of defense. In the standard hierarchy of controls, it sits last, after engineering controls (such as sharps containers, safer needle devices, and local exhaust) and work-practice controls (such as hand hygiene, aseptic technique, and not recapping needles). Barriers protect you and the patient at the point of contact, but they do not replace the safer systems that keep contact from happening in the first place. A podiatrist who relies on gloves while ignoring a full sharps container has skipped the more protective control.

The legal backbone of this element is federal as well as state. The federal Occupational Safety and Health Administration (OSHA) Bloodborne Pathogens Standard, 29 CFR 1910.1030, requires employers to provide appropriate PPE and to do so at no cost to the employee (1910.1030(d)(3)). New York's own training mandate, authorized by Public Health Law Section 239 and Education Law Section 6505-b and set out in the 2018 syllabus, requires that the coursework stay current with the most recent scientifically accepted practices. That standing-current requirement is why this lesson also folds in the CDC's Enhanced Barrier Precautions, which took effect on April 9, 2024, even though New York has not yet reprinted the syllabus.

Element IV's first content section catalogs the barrier types and the criteria for selecting them. Start with gloves. By use, gloves are sterile, non-sterile, or utility. Sterile gloves are individually packaged and used for invasive or aseptic procedures, such as an in-office nail matrixectomy, where the patient's tissue must be protected from your skin flora. Non-sterile exam gloves are for routine care where contact with blood, body fluids, mucous membranes, or non-intact skin is anticipated, such as a routine dressing change. Utility gloves are heavier reusable gloves for environmental cleaning, instrument reprocessing, and handling chemical disinfectants; they may be decontaminated and reused unless they are cracked, peeling, torn, or punctured.

Glove material matters as much as glove type. Natural rubber latex gives excellent fit and barrier performance but can trigger latex allergy in patients and staff, so a latex-safe alternative must always be available. Vinyl (PVC) gloves are latex-free and inexpensive but are less durable and fail more often, making them suitable only for brief, low-risk tasks. Nitrile gloves are synthetic, latex-free, and offer strong puncture and chemical resistance, which makes them the preferred choice for higher-risk tasks and for anyone with a latex sensitivity.

Cover garb is the next barrier group: gowns, aprons, and laboratory coats. What matters is the fluid-barrier characteristic. Fluid-impervious garb blocks liquid penetration and is used when large fluid volumes or soaking are expected, such as a surgical procedure with irrigation. Fluid-resistant garb repels moderate splashes but is not fully impervious. A permeable cloth lab coat provides only minimal protection and is not adequate when blood or other potentially infectious material is anticipated.

Masks, face shields, and eye protection complete the toolkit. Masks come as surgical masks, procedure masks, and particulate respirators. A surgical mask is fluid-resistant and blocks splashes and large respiratory droplets, but it does not seal to the face and does not filter airborne particles. A particulate respirator, such as a NIOSH-approved N95, filters at least 95 percent of airborne particles and is the only one of the three that protects against airborne pathogens. Face shields protect the face and mucous membranes from splashes and are often paired with a mask rather than replacing it. Eye protection means goggles or safety glasses with side shields; ordinary personal eyeglasses are not adequate eye protection.

The syllabus tells you to select PPE based on the interaction you can reasonably anticipate, not on habit. The two selection questions are how the infectious material could reach you and how much of it there is likely to be.

Route of exposure drives the first decision. If you anticipate splashes or sprays of blood or other potentially infectious material toward your face, add a mask plus eye protection or a face shield. In podiatry, powered instruments used for nail debridement and the irrigation of an infected ulcer both generate spray, so face and eye protection belong on the checklist for those tasks. If the concern is respiratory droplets, which are large and travel only a short distance, a surgical mask is appropriate; influenza and pertussis spread this way. If the concern is an airborne pathogen, which travels as tiny nuclei that stay suspended and travel on air currents, a surgical mask is not enough. Tuberculosis, measles, and varicella require a fit-tested particulate respirator and, in a hospital, an airborne infection isolation room.

Fluid volume drives the second decision. Minimal fluid, such as a small dressing change, may call for gloves and perhaps an apron. Large volumes or the likelihood of soaking, such as an in-office surgical case with irrigation, call for a fluid-impervious gown so that liquid cannot strike through to your skin or clothing. Matching the barrier to the anticipated volume prevents both strike-through, which is under-protection, and needless waste, which is over-protection.

Element IV also asks you to choose barriers by their intended need, which can be patient safety, employee safety, or both at once. The same item can serve either goal, so naming the goal keeps your selection honest.

When the intended need is patient safety, sterile barriers are used for invasive procedures to keep the provider's skin flora out of a normally sterile site. During an in-office matrixectomy or a joint injection, sterile gloves and sterile drapes exist to protect the patient from a surgical site infection, and a mask can be added to prevent droplet contamination of the sterile field. The patient, not the provider, is the one being protected by sterile technique.

When the intended need is employee safety, barriers prevent the worker from being contaminated by the patient's blood and body fluids, and masks prevent the worker from inhaling a communicable disease. This is the protection OSHA's Bloodborne Pathogens Standard is built around, and it is why the employer must supply the PPE at no cost to you under 29 CFR 1910.1030. A single task often serves both needs. During a bleeding nail avulsion, the podiatrist's gloves protect the patient's open wound from contamination and protect the podiatrist from the patient's blood at the same time; understanding both purposes is what lets you pick the right combination rather than defaulting to the same PPE for every case.

Selecting the right barrier is only half of Element IV. The syllabus devotes its final section to using barriers correctly, and misuse can eliminate the protection entirely.

Proper fit comes first. Gloves must be the right size to preserve dexterity and avoid tearing. Particulate respirators must be fit-tested under the OSHA Respiratory Protection Standard, 29 CFR 1910.134, and the wearer must perform a user seal check every time, because a poor facial seal lets unfiltered air leak around the edges. Facial hair that crosses the seal defeats a respirator. A surgical mask, by contrast, is not fit-tested and is not a respirator substitute. Barrier integrity comes next: inspect gloves, gowns, and eyewear for tears, punctures, thin spots, and defects, and change any barrier whose integrity is compromised.

Disposable versus reusable is a deliberate choice, not an afterthought. Single-use exam gloves, isolation gowns, and surgical masks are discarded after one use and are never washed and reused. Utility gloves, goggles, face shields, and elastomeric respirators are reusable only if they are properly cleaned and disinfected between uses. Reusable instruments must be reprocessed by cleaning followed by disinfection or sterilization matched to how the item is used; in a podiatry office, semicritical and critical instruments such as nail nippers, curettes, and blades require sterilization, and single-use sharps go straight into a puncture-resistant sharps container.

Cross-contamination is the most common failure. Change gloves between patients and between a dirty task and a clean task on the same patient, and perform hand hygiene after removing them, because gloves are not a substitute for hand hygiene. The syllabus also warns against both over-utilization and under-utilization: under-using PPE exposes people, while over-using it wastes supply, promotes dermatitis, and creates false security, as when a worker wears the same gloves from room to room and spreads contamination. Supply must be available and accessible at the point of care in the correct sizes, a lesson reinforced during pandemic shortages. Finally, appropriate user education must cover the whole cycle: selection, donning, doffing, and disposal. Doffing is the highest-risk step for self-contamination, so the taught sequence is gloves first, then goggles or face shield, then gown, and mask or respirator last, with hand hygiene throughout.

Because Public Health Law Section 239 and the 2018 syllabus require training to reflect the most current scientifically accepted practices, this element now includes the CDC's Enhanced Barrier Precautions (EBP), which became effective on April 9, 2024. EBP is designed for nursing homes, skilled nursing facilities, and other long-term care settings, and it sits between Standard Precautions and Contact Precautions.

EBP expands the use of a gown and gloves beyond the situations where blood or body fluid exposure is anticipated, in order to reduce transmission of multidrug-resistant organisms (MDROs) such as MRSA, VRE, ESBL-producing organisms, CRE, and Candida auris. When Contact Precautions do not otherwise apply, EBP is indicated for a resident who is infected or colonized with an MDRO, or who has a wound or an indwelling medical device such as a central line, a urinary catheter, a feeding tube, or a tracheostomy, regardless of the resident's MDRO status. Under EBP, staff put on a gown and gloves for high-contact resident-care activities: dressing, bathing or showering, transferring, providing hygiene, changing linens, toileting or changing briefs, device care or use, and wound care.

The contrast with Contact Precautions is what makes EBP practical for a long-term home. Residents on EBP are not confined to their rooms and do not require a private room, because the goal is to let people live in a communal setting safely. PPE is worn for the specific high-contact activity rather than for every room entry, and EBP continues for the length of the resident's stay rather than ending when an infection clears. Implementation depends on the same fundamentals as the rest of Element IV: staff training, PPE stocked at the point of care, clear signage that lists which activities require the gown and gloves, and hand hygiene performed before and after each activity.

Walk one morning through a podiatry office to see the whole element in action. The first patient needs a simple callus pared with minimal fluid expected, so the assistant selects non-sterile nitrile exam gloves; the assistant has a latex sensitivity, and nitrile is latex-free with good puncture resistance. Gloves are changed and hand hygiene is performed before the next patient is roomed, even though the gloves looked clean, because reuse between patients spreads contamination.

The second patient is scheduled for an in-office matrixectomy, an invasive procedure. Now the intended need is patient safety, so the podiatrist uses sterile gloves and sterile drapes to keep skin flora out of the surgical site, adds a fluid-impervious gown because irrigation is planned, and dons a mask with a face shield because the powered instrument can spray. Used blades drop into the sharps container, and the reusable nail nipper is sent for cleaning and sterilization rather than wiped and reused.

That afternoon the podiatrist rounds at a skilled nursing facility on a resident who has a chronic foot ulcer and an indwelling urinary catheter but no known MDRO. Enhanced Barrier Precautions apply because of the wound and the device, so the podiatrist dons a gown and gloves for the wound-care activity, performs hand hygiene before and after, and does not confine the resident to the room. Every choice traces back to the same two questions Element IV asks: what contact is anticipated, and whose safety is the barrier protecting.