Sterile Draping: Principles and Common Configurations

Objective. The student will apply sterile drapes for at least three surgical site configurations — including extremity, abdominal, and head/neck setups — without contaminating the field or the patient prep site.

Sterile draping is the process of covering the patient and surrounding surfaces with sterile barriers so that only the intended operative site is exposed. Drapes create and define the sterile field; every action you take during draping either protects or destroys that field. Because a contaminated field places the patient at direct risk for surgical site infection (SSI), accuracy and discipline are not optional.

Core Principles of Sterile Draping

Handle drapes as little as possible. Each unnecessary movement increases the chance that a non-sterile surface will be touched or that the drape will fall below the table level, where it is considered contaminated.

Drapes are placed from the operative site outward. Begin closest to the incision site and work toward the periphery. This sequence protects the cleanest area first and moves contamination risk away from the wound.

Unfold away from yourself and away from the sterile field. Never reach across a sterile drape. Fan-fold drapes so they open in a controlled direction. Keep your gloved hands cuffed over the folded edge to protect them from contact with non-sterile surfaces.

Once placed, a drape is not repositioned toward the sterile field. A drape that has been moved away from the incision site may be adjusted further outward, but pulling it back toward the wound drags contamination with it. If a drape is placed incorrectly, it must be discarded and replaced.

Strike-through is contamination. Any fluid that soaks through a drape from a non-sterile surface to a sterile surface — or vice versa — renders that area non-sterile. Use impervious (fluid-resistant) drapes whenever fluid contact is likely.

Below table level is not sterile. Any portion of a drape that falls below the level of the operating table is considered contaminated and must not be brought back up.

Draping Materials and Their Uses

Laparotomy drapes have a fenestration (opening) sized for abdominal incisions. They cover the patient from head to foot, leaving only the operative window exposed.
Split/bar drapes (leggings) are used in pairs to drape the upper portion of a field when a single large sheet is impractical; common in extremity and perineal procedures.
Fenestrated drapes have a pre-cut opening sized for a specific site; ophthalmologic and ear-nose-throat procedures frequently use small fenestrated drapes.
Impervious stockinettes are knitted, elastic tubes that roll over an extremity after it has been prepped and elevated, creating a circumferential sterile barrier before additional drapes are applied.
Towel clips (non-perforating preferred) secure drapes at corners. Perforating clips, when used, penetrate the drape and the skin; once applied to skin, they are considered contaminated and must not be moved.

Abdominal (Laparotomy) Draping Sequence

1. The scrub technologist squares off the operative site using four sterile towels, placing them edge-to-edge around the incision area. Towels nearest the incision are placed first.

2. Towel clips or an adhesive incise drape secures the towels.

3. The laparotomy drape is opened and positioned over the squared site, with the fenestration aligned over the incision. The drape is unfolded toward the foot of the table, then toward the head, keeping hands cuffed.

4. The top portion of the drape covers the anesthesia screen; the foot end extends over and below the foot of the table.

Extremity Draping Sequence

1. The extremity is held elevated by a non-scrubbed team member or held by the scrub using a sterile impervious stockinette applied from the distal end upward.

2. A split sheet or bar drape is placed beneath the extremity once it is lowered onto the field.

3. Additional drapes cover the proximal body and adjacent surfaces.

4. The stockinette may be rolled back to expose the operative site, or cut with sterile scissors at the incision area.

Head and Neck (Ophthalmology-Style) Draping

1. A fluid-control head drape or split sheet is placed to isolate the head from the body.

2. A small fenestrated drape is centered over the operative eye or surgical site, with the opening exactly over the site.

3. Care is taken to keep drape material from obstructing the airway and to communicate with the anesthesia provider before placing any drape near the face.

Contamination Recognition and Response

Every member of the sterile team is responsible for identifying and announcing contamination immediately. If a breach occurs — a non-sterile hand reaching across the field, a drape falling below table level, or strike-through — you must:

1. State the breach calmly and clearly ("The field has been contaminated at the upper-left corner").

2. Isolate the contaminated drape or area.

3. Replace affected drapes before the procedure continues.

Silence is not acceptable. Patient safety depends on a culture in which any team member, regardless of experience level, speaks up without hesitation.

Safety Summary

Confirm patient identity and operative site before beginning to drape.
Never compromise the field to save time.
Communicate with the anesthesia provider before draping near the airway.
Use impervious materials wherever fluid contact is anticipated.
Document any contamination event per facility policy.

Key terms8

Sterile fieldThe area immediately around the operative site, including draped surfaces and sterile tables, that has been prepared and maintained to the highest level of sterility achievable during a surgical procedure.

FenestrationA pre-cut opening in a surgical drape that exposes only the operative site while the surrounding tissue and patient remain covered.

Strike-throughContamination that occurs when fluid soaks through a drape from a non-sterile surface to a sterile surface or vice versa, rendering the affected area non-sterile.

Impervious stockinetteAn elastic, fluid-resistant knitted tube rolled over a prepped extremity to create a circumferential sterile barrier before additional drapes are applied.

Towel clipAn instrument used to secure sterile draping towels at the corners of the operative site; perforating types penetrate skin and drape and are considered contaminated once applied.

Laparotomy drapeA large sterile drape with a fenestration sized for abdominal procedures; it covers the patient from head to foot, exposing only the operative window.

Split/bar drapeA sterile drape used in pairs with a split along one edge, commonly used to drape extremities or to form the upper boundary of a field where a single sheet is impractical.

Draping directionThe principle that drapes are applied beginning at the operative site and unfolded outward toward the periphery, and that drapes are never repositioned back toward the incision site once placed.

In class: Demonstration and guided practice: instructor drapes a low-fidelity patient mannequin for an abdominal procedure while narrating the rationale for drape sequence and direction of unfold; students then replicate the sequence on the mannequin. · Rotation stations: students rotate through three draping stations (extremity with impervious stockinette, abdominal laparotomy, and head/neck ophthalmology-style) and complete each setup using the AST draping checklist. · Contamination-recognition scenario: a confederate student intentionally reaches across the sterile field during draping; observing students must identify the breach, verbalize the response, and demonstrate re-draping of the affected area.
Materials: Sterile drape packs (laparotomy, extremity, split/bar, fenestrated), impervious stockinettes, towel clips, low-fidelity patient mannequin, AST draping checklist
Check: Instructor-scored AST draping checklist; all three configurations must be completed with zero critical contamination events; overall score of 80% or higher required to pass.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.