7.2 Clinical Asepsis, Universal Precautions & Vitreous Specimen Collection

Clinical Asepsis and Vitreous Specimen Collection

Intraocular procedures have little tolerance for contamination. The technician's role is to create a reliable environment, protect the sterile field, preserve specimen identity, and escalate any break. Aseptic technique does not mean that every item in the room is sterile; it means clean and sterile zones are deliberately separated and protected.

Standard precautions and preparation

Perform hand hygiene at the required moments and select personal protective equipment from the anticipated exposure. Clean and disinfect the room and reusable equipment with products compatible with each surface. Keep medication preparation away from sinks, used instruments, specimens, food, and personal items.

Before a procedure, reconcile two patient identifiers, eye and site, procedure, medication, concentration, dose, route, allergies, expiration, and consent or order status as assigned. The team resolves every mismatch before opening or administering a product.

Masks, speaking limits, sterile drapes, eyelid isolation, and other controls follow current procedure policy. Their purpose is to reduce contamination from droplets, lashes, lids, hands, and the environment. A sterile glove that touches a nonsterile surface is contaminated even if the surface looks clean.

Ocular antisepsis

Povidone-iodine is widely used for ocular-surface antisepsis before intraocular procedures. Use the ophthalmic concentration, volume, application site, and contact time specified by the current order, label, and facility protocol. Do not substitute an alcohol-containing skin preparation on the ocular surface. A reported iodine, contrast, or shellfish allergy is not automatically a povidone-iodine allergy; clarify the actual prior reaction and route it to the clinician.

If the clinician selects aqueous chlorhexidine because povidone-iodine cannot be used, follow the exact ophthalmic protocol and product concentration. Skin formulations containing alcohol or detergents can injure ocular tissue. The technician should never improvise a dilution.

Topical antibiotics are not a replacement for antisepsis. Whether they are used is determined by the procedure protocol and clinician, not by habit.

Sterile-field protection

Open packages without reaching over the field. Check integrity, indicator, expiration, lot, and moisture. Present items so the sterile operator can take them without contact. Keep hands in view and above waist level when policy defines that boundary. Limit traffic and unnecessary conversation.

If a package is torn, wet, expired, dropped, or of uncertain sterility, do not use it. If a needle, syringe tip, cap, medication port, or sterile glove contacts a nonsterile surface, announce the break immediately and replace the affected item. Concealing a break creates more harm than pausing.

Vitreous and aqueous specimens

The licensed practitioner obtains the specimen. Before collection, verify the laboratory order and obtain the required sterile containers, slides, transport media, requisitions, and labels. Different studies may require different material and handling, and local microbiology capabilities matter.

At the bedside, label the specimen with required identifiers, source such as vitreous or aqueous, right or left eye, collection date and time, and collector information. Use the laboratory's wording; do not label a specimen simply eye culture. Match every container to the requisition and use closed-loop read-back.

Small-volume ocular specimens are precious. Transport them promptly under the laboratory-specified temperature and atmosphere. Do not refrigerate, freeze, add transport medium, expel air, or transfer between containers unless the laboratory protocol requires it. If volume is limited, the clinician and laboratory determine test priority.

Medication support

Empiric intravitreal therapy can involve highly concentrated medications with very small final volumes. Dose selection, substitution, compounding, and administration are licensed-clinician and pharmacy functions. The technician may retrieve, verify, and present medications only within training and delegation. Use separate, correctly labeled syringes when the order and pharmacy instructions require them; never combine products because they look compatible.

Exposure and incident response

Dispose of sharps immediately in the approved container. Do not recap or hand-manipulate them unless an approved procedure specifically requires an engineered method. For a needlestick or mucous-membrane splash, wash or flush promptly, notify the supervisor, and enter the occupational-exposure pathway without delay. Preserve the facts, container labels, and timing.

The exam-worthy principle is simple: verify identity, preserve asepsis, follow validated instructions, protect specimen integrity, and stop whenever safety is uncertain.

Chain of custody and exposure response

Before a specimen leaves the room, match two patient identifiers, eye, source, requested tests, container, preservative, collection time, and collector information with the order. Confirm whether microbiology needs separate aerobic, anaerobic, fungal, molecular, or pathology containers; never divide a scarce ocular specimen by guesswork. Record transport temperature and time requirements and hand the sample to the approved courier or laboratory process. If labeling, container, volume, or transport is uncertain, stop and call the receiving laboratory while preserving the specimen.

For a needlestick, splash, or mucous-membrane exposure, perform immediate first aid, notify the designated supervisor, and enter the occupational-exposure pathway without waiting for symptoms. Source-patient testing and post-exposure medication require consent and professional evaluation under law and policy. Document the event factually while protecting privacy.