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An isolation sign is the notice posted at a patient’s room entrance that tells staff and visitors which transmission-based precautions apply and what to do before entering. The CDC’s 2007 isolation guideline sets what each precaution requires, such as a single room or a door kept closed, but it does not prescribe sign colors or design. Colors are set locally, so the same color can mean different things in different facilities.
This page is general information for clinic, infection-prevention and supply staff. It is not medical advice and does not replace your facility’s infection prevention policy.
Short answer
An isolation sign identifies the precaution category in effect (for example Contact, Droplet or Airborne), lists the protective equipment to put on, and directs visitors. The CDC guideline specifies room placement for each category but is silent on sign color and design. Standard color schemes come from state, health-system or facility programs, such as the voluntary North Carolina scheme shown below. Always read the words and pictures on the sign, never rely on color alone.
Definition and scope
“Isolation precautions signs” are door or room-entrance signs that go with the transmission-based precautions described in the CDC’s Guideline for Isolation Precautions (2007). They are different from respiratory hygiene signs, which the guideline recommends posting at entrances and other strategic places in ambulatory and inpatient settings, in language appropriate to the population served, with instructions to patients and accompanying family or friends. For the precautions themselves, see the CASRAI guide to transmission-based precautions.
What CDC specifies, and what it does not
The table lists what the CDC guideline text (Part III and the recommendations) says about placement and signage, so you can see which part of a sign program is national guidance and which is local choice.
| Topic | What the CDC guideline says |
|---|---|
| Contact Precautions | A single-patient room is preferred. |
| Droplet Precautions | A single patient room is preferred. |
| Airborne Precautions | The preferred placement is an airborne infection isolation room (AIIR); where none is available, a private room with the door closed is described. See the guide to the airborne infection isolation room. |
| Respiratory hygiene signs | Post signs at entrances and strategic places (for example elevators and cafeterias), in language(s) appropriate to the population served. |
| Identifying patients in ambulatory settings | Develop systems (for example triage and signage) to identify patients with known or suspected infections that require Airborne Precautions. |
| Sign color, layout or wording | The Contact, Droplet and Airborne sections do not prescribe a design, color or wording. |
How isolation signs are used in practice
Because the national guideline leaves sign design open, programs standardize locally. The history is documented by NC SPICE (the North Carolina Statewide Program for Infection Control and Epidemiology at UNC School of Medicine): it reports that the CDC’s 1975 Isolation Techniques in Hospitals (2nd edition) introduced color-coded category door signs, and that in 2008 NC SPICE and NC APIC created uniform color-coded signs for the state. Its stated reason is that “variation in signage makes care more difficult and puts patients and residents at risk.” Use of the SPICE signage is voluntary.
SPICE’s design goals are a useful model for any sign program: large, simple pictures; minimal reading; no need for family and visitors to go looking for nursing staff; family education; and easy access for staff.
Worked example: the NC SPICE color map
The table shows the ten categories and colors in NC SPICE’s standardized signage as presented in its 20 April 2022 update. It is one scheme, not a national standard; your facility may use different colors for the same categories.
| Sign category | Color in the NC SPICE scheme |
|---|---|
| Standard | Coral |
| Contact | Orange |
| Enteric | Orange with brown |
| Droplet | Green |
| Airborne | Blue |
| Neutropenic | Purple |
| Contact Droplet | Green and orange |
| Special Droplet Contact | Red, green and orange |
| Protective | Gray |
| Enhanced Barrier | Teal |
SPICE’s sign library page, which is newer than the 2022 deck, lists twelve signs, adding Airborne Contact and Enhanced Droplet and using the name Droplet Contact. Each sign has a flip side with additional detailed information, and PDFs include a translation page. Treat the library page as the current list.
What the sign content says
In the SPICE examples, the Airborne sign calls for an N95 or higher respirator, a private room or AIIR, and a closed door to maintain negative pressure, and directs visitors to the nurses’ station. The Contact sign calls for gown and gloves and disposable or dedicated equipment. The Droplet sign calls for a surgical or procedure mask on entering. For the order of putting on and removing equipment, see the PPE donning and doffing sequence guide.
Where it matters for clinics and supply decisions
A sign program is a set of decisions that can be reviewed against sources. A facility reviewing its signs can check the following points, each traced above or to a linked CASRAI guide:
- Category matches placement. The sign category should match the room requirement for that precaution (single room, AIIR, door closed).
- Equipment is listed on the sign. CDC’s enhanced barrier guidance, summarized in the guide to enhanced barrier precautions, says a sign should list the precaution type and the required PPE; that guide also notes the sign must not disclose the resident’s diagnosis.
- Language fits the population. The CDC guideline asks for respiratory hygiene signs in language(s) appropriate to the population served; SPICE provides translation pages.
- Visitors know where to go. SPICE’s design goals include sending visitors to the nurses’ station rather than leaving them to search.
- Removal is sequenced. CASRAI’s guide to terminal cleaning flags removing the sign at discharge before environmental services is told as a sequencing error.
- Consistency across sites. SPICE’s rationale for standardizing is that variation makes care more difficult when staff work in several settings.
Common misunderstandings
“Isolation sign colors are universal.”
No national color standard is described in the CDC guideline. The NC SPICE scheme is voluntary and state-level; other facilities choose their own. Read the text and pictures on the sign.
“The sign should name the diagnosis.”
For enhanced barrier precautions, CDC says the sign must not disclose the resident’s diagnosis. It names the precaution and equipment instead.
“The sign can come down as soon as the patient leaves.”
Terminal cleaning follows discharge, and removing the sign before environmental services is told is a sequencing error described in the terminal cleaning guide.
Frequently asked questions
What do isolation precautions signs show?
They show the precaution category, the protective equipment to wear and any entry instructions. In the NC SPICE examples this includes the respirator, gown, gloves or mask required and, for Airborne, keeping the door closed.
What is the difference between Contact, Droplet and Airborne signs?
In the SPICE examples, Contact calls for gown and gloves, Droplet for a surgical or procedure mask on entering, and Airborne for an N95 or higher respirator with the door closed in a private room or AIIR. The room preferences come from the CDC guideline: a single-patient room for Contact and Droplet, an AIIR for Airborne.
Does CDC require a particular sign color?
The CDC’s Contact, Droplet and Airborne sections do not specify sign color, design or wording.
Sources
- CDC, Guideline for Isolation Precautions: Preventing Transmission of Infectious Agents in Healthcare Settings (2007), Part III (precautions): cdc.gov precautions; recommendations: cdc.gov recommendations. Checked 2026-10-30.
- NC SPICE, UNC School of Medicine, Updates to Unified SPICE Isolation Signage (K. Hoffman, 20 April 2022). Checked 2026-10-30.
- NC SPICE, NC standardized isolation signage library. Checked 2026-10-30.
