The operating room is a highly controlled environment designed to minimize infection risks and protect both patients and staff. To achieve this, the physical layout is divided into distinct zones based on cleanliness requirements.
Aseptic technique encompasses all practices intended to prevent microbial contamination and maintain a sterile environment during surgery. Once a sterile field is established, maintaining its integrity is a shared responsibility among all surgical team members.
Only sterile items and personnel who have scrubbed, gowned, and gloved may touch items within the sterile boundary. Gowns are considered sterile from the chest to the level of the sterile field, and sleeves from two inches above the elbow to the cuffs. The back of the gown is considered unsterile. Tables are sterile only at table level; any item that falls below the edge of the table is contaminated and must be discarded. When pouring sterile liquids, the lip of the bottle should not touch the receiving basin, and the liquid must be poured without splashing to prevent liquid bridges that draw bacteria through wet drapes.
Before participating in a sterile surgical procedure, personnel must perform a surgical hand scrub to reduce the resident flora and transient microbial count on the hands and forearms to an absolute minimum. Traditional water-based scrubbing with an antimicrobial agent like chlorhexidine gluconate or povidone-iodine requires systematic friction from fingertips to elbows for a specified duration, usually three to five minutes. Alcohol-based hand rubs are also widely accepted when following validated manufacturer protocols.
After scrubbing, hands must be kept higher than the elbows at all times while entering the operating room to ensure water drains downward away from clean hands. Drying is performed using a sterile towel, working from fingers toward the elbow without returning to a previously dried area. Gowning and closed-gloving techniques follow, ensuring the bare skin of the hands never touches the outside of the sterile gown or glove surface.
Surgical safety checklists bridge communication gaps and prevent never-events such as wrong-site surgery, wrong-procedure surgery, or wrong-patient interventions. The World Health Organization (WHO) surgical safety checklist divides the operation into three distinct phases:
Proper patient positioning protects nerves, maintains adequate ventilation, and provides optimal surgical exposure. Common positions include supine, prone, lithotomy, and lateral decubitus. Improper positioning can lead to peripheral nerve injuries, pressure ulcers, and compromised venous return.
Surgical skin preparation reduces resident microbial skin flora to prevent surgical site infections. Antiseptic agents such as chlorhexidine gluconate in alcohol or povidone-iodine are applied using sterile forceps and sponges. The preparation begins at the intended incision site and moves outward in concentric circles toward the periphery. Once the sponge passes over the outer edge, it is never brought back to the clean center. Staff must also ensure that skin prep solutions do not pool underneath the patient, as trapped alcohol or iodine can cause severe chemical skin burns when exposed to electrosurgical units.
Retained surgical items represent a serious preventable medical error that causes patient harm, sepsis, and legal liability. To prevent this, strict counting protocols are executed for all sponges, sharps, and instruments.
The operating room presents multiple occupational and patient safety hazards that require strict mitigation protocols. Sharps injuries from needles and scalpel blades pose significant transmission risks for bloodborne pathogens like HIV, hepatitis B, and hepatitis C. Staff must utilize safe handling techniques, such as using a neutral zone or instrument pass-hand without direct hand-to-hand transfer of sharps.
Surgical smoke plume generated by lasers and electrosurgical units contains toxic gases, cellular debris, and viable viruses, requiring dedicated smoke evacrators and high-efficiency particulate air filtration. Additionally, proper management of hazardous waste, biofluid spills, and adherence to strict ventilation pressure gradients—maintaining positive pressure inside the OR relative to corridors—ensures that contaminated outside air does not enter the surgical suite when doors open.