Lord Joseph Lister proved in 1867 that surgical hand antisepsis dramatically reduced post-operative mortality. More than 150 years later, the principle remains unchanged — what has changed is the molecule of choice. Chlorhexidine Gluconate 4% has become the international standard for surgical hand antisepsis because of one property no other antiseptic possesses: substantivity — the ability to bind to the skin's keratin proteins and keep working for hours, including beneath a tight, warm sterile glove.
At a 4% concentration, CHG works through the same mechanism as lower concentrations — but with a kill speed and residual duration designed specifically for the surgical environment.
Positively charged CHG molecules bind to the cell walls of commensal and transient bacteria on the hands with high affinity. Binding occurs within seconds of contact.
At a 4% concentration, CHG rapidly damages the cell membrane — intracellular components coagulate and leak out. Reduction of skin bacterial flora reaches 99.9% within the first 2 minutes of the scrub.
This is the key clinical differentiator of CHG 4%: the CHG molecule binds to the keratin proteins of the stratum corneum and remains active for up to 6 hours — preventing the regrowth of bacterial flora beneath the sterile glove for the entire duration of the surgical procedure.
Clinical literature shows a cumulative antimicrobial effect: surgical teams that consistently use CHG 4% over several days have a persistently lower baseline skin flora than users of povidone iodine or alcohol-based scrubs.
Recommended by the WHO Guidelines on Hand Hygiene in Health Care and the CDC Guideline for the Prevention of Surgical Site Infection as the antiseptic of choice for surgical hand preparation.
Rapid reduction against S. aureus, MRSA, S. epidermidis (a common cause of surgical site infection), Enterococcus, E. coli, and P. aeruginosa. Effective against commensal skin flora at risk of translocation when the hands are gloved.
Effective against HIV, Hepatitis B & C, SARS-CoV-2, Herpes Simplex — relevant to procedures with a potential exposure to blood and body fluids.
Active against Candida spp. including C. auris, a global concern for nosocomial infections in immunocompromised patients.
A technical summary ready to share with the OK, IPC, and hospital procurement teams.
A 4% concentration is the clinical figure established by surgical antisepsis literature over the past 50 years. This is no arbitrary concentration — at 4%, CHG achieves a sufficiently rapid bactericidal kill within a standard 2-minute scrub, while also delivering the 6+ hours of substantivity needed for lengthy surgical procedures.
The Plain (fragrance-free) version is chosen by surgical teams for three operational reasons: first, some patients and staff are hypersensitive to perfume in the enclosed environment of the OK; second, fragrance can cling to sterile drapes and interfere with the sense of smell of anaesthetists, who rely on smell to detect gas leaks; third, laboratory efficacy evaluations are conducted without sensory interference.
Every surgical area and invasive procedure shares the same standard expectation: hand preparation that is auditable and validated.
A surgical scrub technique validated by AORN (Association of periOperative Registered Nurses) — a duration and sequence that must never be cut short.
Remove all hand and wrist jewellery. Nails must be short (≤2 mm from the fingertip) with no nail polish, acrylic nails, or long nails. Inspect the skin for wounds or lesions.
Wet the hands up to the elbows with warm water. Apply 5 ml of Hand Scrub Plain to the wet palms. Build a rich lather, then distribute it from the fingertips to 5 cm above the elbows.
Use a soft single-use brush on the nails and fingertips (30 seconds per hand). Then scrub with your own hands: fingers (4 sides of each finger, 10 counts), palms, backs of the hands, up to the elbows. Always keep the hands higher than the elbows.
Rinse from the fingertips to the elbows — let the water flow towards the elbows. Dry with sterile gauze using a press-not-rub technique, from the fingertips towards the elbows. Continue with sterile gowning and gloving.
Details ready to attach to procurement documents, IPC/IPCN evaluations, or your facility's formulary.
A 4% concentration requires slightly more disciplined handling than lower-strength formulations. The following are important notes for surgical and housekeeping teams.
CHG is not indicated for the middle ear due to the risk of ototoxicity, or for direct application to the meninges (brain tissue). For pre-operative skin antisepsis on the face and head, use carefully around the eyes.
CHG can be absorbed through the immature skin of premature infants. For premature neonates, use a specialised formulation or an alternative in accordance with neonatology protocols.
Anaphylaxis to CHG is very rare but documented. Check the patient's allergy history before applying pre-operative skin prep, and document any reactions after use.
Cationic CHG loses its activity when mixed with conventional anionic soaps. Do not use after povidone iodine on the same skin surface without thorough rinsing.
Must not be swallowed. Avoid application to deep open wounds. Keep out of the reach of children without supervision.
Every surgeon begins a procedure with the same ritual for a full two minutes. It is not a formality — it is the first line of defence against surgical wound infection. We formulated EMGUARD® Hand Scrub Plain as a clinical instrument for that ritual, not as a soap.
Our technical team is ready to provide the MSDS, efficacy test certificates (in-vitro time-kill assay), and recommendations for elbow-operated dispenser systems for your OK.