A CHG bath is a full-body wash using chlorhexidine gluconate, an antiseptic that kills bacteria on the skin and keeps working for hours afterward. Hospitals use CHG baths most often in intensive care units to prevent dangerous infections, especially in patients with central lines, surgical wounds, or weakened immune systems. If you or a family member has been told to expect CHG bathing during a hospital stay, here’s what it involves and why it matters.
How CHG Works on the Skin
Chlorhexidine gluconate carries a positive electrical charge that attracts it to the negatively charged surfaces of bacterial cells. Once it reaches a bacterium, it disrupts the cell wall, causing the contents to leak out and the cell to die. At the concentrations used in hospital bathing, this effect is strong enough to kill bacteria on contact.
What makes CHG especially useful is a property called substantivity: the molecule binds to skin and continues suppressing bacterial growth long after the bath is over. On skin, this residual protection can last many hours, which is why CHG baths are typically given once daily rather than multiple times. The antiseptic essentially leaves an invisible antimicrobial layer behind, reducing the number of bacteria living on your skin throughout the day.
Why Hospitals Use CHG Baths
The skin naturally harbors millions of bacteria. Most of the time that’s harmless, but in an ICU, bacteria on the skin can travel along IV lines, catheters, or surgical sites and enter the bloodstream. These healthcare-associated infections are a leading cause of complications in hospitalized patients.
A systematic review and meta-analysis of ICU patients found that daily CHG bathing reduced bloodstream infections related to central lines by 56%. It also reduced MRSA colonization (the presence of drug-resistant staph bacteria on the skin) by 41% and MRSA bloodstream infections by 36%. Those numbers are significant enough that many hospitals now make CHG bathing the default for all ICU patients, replacing regular soap and water for the duration of the stay. The Agency for Healthcare Research and Quality recommends CHG as a replacement for routine bathing throughout an entire ICU admission.
What Happens During a CHG Bath
A CHG bath looks different depending on whether you can shower or need to be bathed in bed. Both approaches follow a specific sequence designed to clean the body systematically while avoiding sensitive areas.
Bed Bathing With 2% Wipes
For patients who can’t get up, nurses use pre-moistened disposable cloths containing 2% chlorhexidine. A standard bath uses six cloths, applied in this order:
- Cloth 1: Face, neck, and chest (avoiding the eyes and ears)
- Cloth 2: Both shoulders, arms, and hands
- Cloth 3: Abdomen, then the groin area
- Cloth 4: Right leg and foot
- Cloth 5: Left leg and foot
- Cloth 6: Back of the neck, back, and buttocks
The nurse will also clean about six inches of skin around any tubes, IV lines, or drains. The key step: the skin is left to air dry and is never rinsed off. Rinsing would remove the CHG layer that provides lasting protection.
Showering With 4% Liquid
Patients who can stand and shower use a 4% CHG liquid soap instead. Unlike the wipes, this version gets rinsed off after use, following the manufacturer’s instructions. Despite the higher concentration number, the rinse-off step means less CHG actually stays on the skin.
2% Wipes vs. 4% Liquid Soap
The two products aren’t interchangeable, and the no-rinse wipes deliver significantly better results. A prospective comparative study measured bacterial counts and CHG skin levels after each method. Patients bathed with 2% no-rinse cloths had an average of 691 colony-forming units of bacteria per square centimeter of skin, compared to 1,627 for those washed with 4% rinse-off liquid and 8,519 for patients who received no CHG bath at all.
The difference comes down to how much antiseptic remains on the skin. CHG skin concentration averaged 1,300 parts per million after the 2% cloths but only 307 ppm after the 4% liquid, because rinsing washes most of it away. The wipes cost more per bath (roughly $6 versus under $1 for the liquid), but their superior bacterial reduction is why most ICU protocols favor them for bedbound patients.
Why Regular Soap Is Avoided
If you’re receiving CHG baths, your care team will likely ask you not to use regular soap, lotion, or moisturizer. Standard soaps carry a negative charge that neutralizes CHG’s positive charge on contact, effectively canceling out the antiseptic’s residual protection. Research has shown that washing with ordinary soap after a CHG application can completely destroy the lingering antimicrobial effect. This is why hospitals replace routine bathing with CHG rather than simply adding it on top of a normal wash routine.
Side Effects and Skin Reactions
Most people tolerate CHG baths well, but skin irritation is the most common side effect. This can show up as redness, itching, dryness, or a mild burning sensation, particularly in patients with sensitive skin or those receiving daily baths over a long ICU stay. More serious allergic reactions, including facial swelling, blistering, or difficulty breathing, are rare but possible.
CHG is not recommended for infants younger than two months because their thinner skin absorbs more of the chemical and is more prone to irritation. For premature babies and other NICU patients, the CDC considers CHG bathing a conditional recommendation, noting that the benefits need to be weighed against the risks for each individual infant. The product should also be kept away from the eyes, ears, and deep open wounds.
What to Expect as a Patient
If you’re admitted to an ICU, CHG bathing will likely start on your first day and continue daily until you leave the unit. The bath itself takes only a few minutes. The cloths may feel cool on the skin, and you might notice a faint medicinal smell. Your skin should air dry within a couple of minutes, after which gowns and bedding can be placed as normal.
You won’t need to do anything special afterward, but avoid applying lotion, powder, or deodorant directly after the bath, as these products can interfere with CHG’s protective layer. If you notice persistent redness, itching, or any sign of a rash developing, let your nurse know so the protocol can be adjusted.