What is Chlorhexidine Gluconate (CHG)?

Chlorhexidine Gluconate (CHG) is a chemical compound, a salt form of chlorhexidine, which is often used in healthcare settings as an antiseptic and disinfectant to reduce the risk of infection. Additionally, it plays an important role in skin and wound care by cleansing the skin before surgical procedures and helping reduce bacteria during wound care.

Chlorhexidine gluconate is also used in certain prescription oral rinses at specific concentrations to help manage oral bacteria and gingivitis by reducing bacterial build up associated with plaque.¹ It works by disrupting the cell membranes of bacteria and other microorganisms.² Depending on the concentration and exposure time, it can either inhibit microbial growth or cause microbial cell destruction.

2% CHG vs 4% CHG: What's the Difference?

The main difference between 2% and 4% CHG is the concentration and intended application. Both formulations use chlorhexidine gluconate as the active antiseptic ingredient, but they are commonly used in different clinical settings.²

2% CHG Applications

There are several applications for 2% CHG (chlorhexidine gluconate) due to its broad-spectrum antimicrobial activity and ability to help reduce microorganisms on the skin.

1. Surgical site preparation: 2% CHG is commonly used to prepare the skin before surgical procedures to help reduce the number of microorganisms on the skin and lower the risk of surgical site infections. Some products, such as 3M SoluPrep Chlorohexidine Wipe combine 2% CHG with 70% isopropyl alcohol (IPA). This formulation provides effective antimicrobial activity and supports skin antisepsis prior to invasive procedures.³
2. Pre-procedure skin cleansing: 2% CHG can be used to disinfect skin prior to certain medical procedures, such as catheter insertion, injections, and other invasive interventions. In these cases, aqueous CHG products, such as Stanhexidine Aqueous Blue 2% CHG, provide antiseptic protection without the addition of alcohol and may be suitable when an aqueous formulation is preferred.
3. Wound care: 2% CHG may be used for cleansing the skin around minor cuts, abrasions, and wound areas when an antiseptic is appropriate. Topical antiseptics such as Dexidin 2 Antiseptic Solution are designed to reduce bacteria on the skin and support infection prevention during minor skin injuries and surgical preparation.
4. Central line care: 2% CHG is commonly incorporated into vascular access infection prevention protocols, including skin preparation before central line insertion, to help reduce the risk of catheter-related bloodstream infections (CLABSI).²

4% CHG Applications

4% CHG is a higher concentration antiseptic formulation commonly used for surgical hand preparation and preoperative skin cleansing. Compared with lower concentrations, 4% CHG products are typically selected when a stronger antiseptic wash or scrub formulation is required. The applications for 4% CHG include:

1. Skin antisepsis: 4% CHG is commonly used for preoperative handwashing by surgical personnel to reduce microorganisms on the hands before sterile procedures. Products such as the BD E-Z Scrub Surgical Scrub Brush contain 4% CHG and are designed for surgical hand preparation and skin cleansing in healthcare environments.
2. Preoperative skin cleansing: 4% CHG can be used for preoperative skin cleansing before surgical procedures to help reduce bacteria on the skin and support infection prevention protocols.
3. Healthcare facility cleansing protocols: 4% CHG may be used in healthcare environments as part of antiseptic cleansing protocols where a higher-concentration CHG formulation is indicated.

Chlorhexidine Safety Considerations

Although chlorhexidine is widely used in healthcare settings, some individuals may experience skin irritation or allergic reactions.² Healthcare professionals should follow product instructions carefully and avoid contact with sensitive areas such as the eyes, ears, and certain mucous membranes unless specifically indicated for that use.