Veterinary Surgical Prep: Clipping, Scrubbing, and Maintaining Sterile Technique

The clipped area should extend at least two times the expected incision length in all directions. This ensures adequate draping margins and accounts for potential surgical field expansion. Use a #40 clipper blade for a close clip. Clip in the direction of hair growth to reduce skin irritation, then make a final pass against the grain for maximum hair removal.

Avoid creating clipper burns or skin abrasions, which compromise the skin barrier and increase infection risk. Use sharp, clean blades and apply light, even pressure. For orthopedic procedures, clip the entire limb circumferentially from at least one joint above to one joint below the surgical site. Remove loose hair with a vacuum or lint roller before transporting the patient to the operating room.

Two antiseptic agents dominate veterinary surgical preparation: chlorhexidine gluconate (CHG) and povidone-iodine (PVP-I). Each has distinct properties that influence selection.

Chlorhexidine is generally preferred for most procedures due to its superior residual activity. Povidone-iodine is preferred around the eyes and ears where chlorhexidine is contraindicated. Never mix chlorhexidine and povidone-iodine—they are chemically incompatible and mutually inactivating.

The standard scrub pattern uses concentric circles moving from the incision site outward to the periphery of the clipped area. This technique moves contaminants from the cleanest area (incision center) to the least clean area (clip margins).

Perform at least three alternating applications of antiseptic scrub and rinse agent. Each application consists of: (1) apply scrub solution with a gauze sponge in concentric circles from center to periphery, (2) discard the gauze, (3) wipe in the same pattern with an alcohol-soaked or saline-soaked gauze for rinsing, (4) discard. Use a fresh gauze for each pass. The total contact time should be a minimum of 3-5 minutes. The final application uses antiseptic solution (not scrub) and is allowed to dry—this drying time is essential for bactericidal activity.

Open gloving is the standard technique for most vet techs assisting in surgery. After performing a hand scrub, dry hands with a sterile towel, then don the gown with assistance from a non-sterile team member who ties the back. For gloves, grasp the inner cuff of the first glove with the bare hand, insert the opposite hand, then use the gloved hand to pick up the second glove by its folded cuff.

Closed gloving is preferred when acting as primary surgeon or when maximal sterility is required. The hands remain within the gown sleeves; the gloves are manipulated onto the hands through the gown cuff material. This technique provides an additional barrier against contamination but requires more practice.

Glove size should be exact. Oversized gloves reduce dexterity and are more prone to puncture; undersized gloves cause hand fatigue and are more likely to tear. Double gloving is recommended for orthopedic procedures and when instrument-related puncture risk is high.

Sterile drapes isolate the surgical field from surrounding non-sterile areas. Place the first drape on the side closest to you, then the opposite side, then the remaining two sides. Once a drape is placed, do not reposition it—it can only be moved further away from the incision site, never closer. Secure with towel clamps penetrating the skin (Backhaus) or adhesive drapes. Adhesive incise drapes (e.g., Ioban) provide an additional barrier and are particularly useful for contaminated or orthopedic procedures.

Recognizing and responding to sterility breaches is a core competency. Common breaks include: reaching across the surgical field, a non-sterile person brushing against the gown below waist or above chest level, dropping an instrument off the field, a hole or tear in a glove (immediately re-glove), moisture strike-through on drapes (contaminated fluid wicking through), and arms falling below waist level. When a break occurs, acknowledge it immediately, re-glove or re-drape as needed, and document the incident.