# California RDA Exam Area 3A: Infection Control and Patient Safety

What Area 3A of the California RDA exam tests: standard precautions, PPE, sharps and exposure rules under 16 CCR 1005 and Cal/OSHA.

Area 3A · 15% of the California RDA exam. Last updated 2026-09-23.

Subarea 3A, Patient Safety and Prevention of Disease Transmission, is the largest regulation-anchored block on the California Registered Dental Assistant Combined Written and Law and Ethics Examination. It accounts for 15% of your total score and tests how you protect patients in the chair and stop disease from moving between people in a dental office. Because the exam tests the legal standard rather than office habits, your answers must match the Dental Board's infection control regulations and Cal/OSHA standards exactly.

## At a glance

| Detail | What the sources establish |
| --- | --- |
| **Weight** | 15% of the exam, covering tasks T37–T42. [^B1] |
| **Core texts** | 16 CCR §1005 (Board standards), 8 CCR §5193 (Cal/OSHA), and CDC guidelines. [^A15] [^A24] [^C2] |
| **Universal floor** | Standard precautions apply to all patients; a patient's disclosed or apparent status never lowers that floor. [^A15] |
| **Training clock** | An unlicensed assistant must complete an approved infection-control course, or the DANB Infection Control exam, *before* exposure-prone procedures. [^A3] [^A32] |
| **Supervision hook** | Administering or assisting with emergency oxygen is a direct-supervision duty written into the duty text itself. [^A4] |

## What the exam expects you to know

### T37 — Patient safety precautions and equipment

Patient safety begins before the procedure starts. You must review the patient's medical and dental history at every appointment to check for allergies to latex, local anesthetics, or dental materials, as this dictates what you set up on the tray. During treatment, your primary physical safety role is protecting the patient's airway and soft tissue. When small items like crowns or endodontic files are used, you must protect the airway with a dental dam or a gauze throat screen. Instrument transfers always occur below the patient's chin, never across the face. [^C1]

Radiation safety is also tested here. To operate dental radiographic equipment in California, you do not need an RDA license. You need a Board-approved radiation safety course, and the certificate must be displayed at the facility. [^A14] [^A3] During exposures, you must use beam-alignment holders rather than having the patient or staff hold the sensor, and the operator must stand behind a protective barrier. [^C1]

### T38 — Barriers, air evacuation, and rinses

This task tests how you control aerosol and spatter at the source. Surface barriers are placed on hard-to-clean touched surfaces before the patient is seated and are removed with gloved hands between patients. They are an alternative to cleaning and disinfecting those specific surfaces, not an excuse to skip cleaning if the surface becomes contaminated. [^A15] [^C2]

For air evacuation, you must know the difference between devices. The high-volume evacuator (HVE) has a wide-bore tip and is the primary tool for capturing aerosol and spatter during high-speed cutting or ultrasonic use. The saliva ejector is a low-volume device meant only for pooled fluid; it does not control aerosol, and patients should never close their lips tightly around it because the seal can pull previously suctioned fluid back into their mouth. Pre-procedural antimicrobial rinses lower the microbial load a patient releases, but they supplement the dental dam and HVE rather than replacing them. [^C1] [^C2]

### T39 — Hand hygiene protocols

The California Dental Board sets strict hand hygiene rules. You must wash your hands with soap and water at the start and end of each workday. Before each patient, contaminated or visibly soiled hands are washed with soap and water; when hands are not visibly soiled or contaminated, an alcohol-based hand rub may be used instead. Hands must be thoroughly dried before gloving to prevent the promotion of bacterial growth. [^A15]

Gloves are never a substitute for hand hygiene, and you must perform hand hygiene after removing gloves because gloves can develop unseen defects during use. [^C2] Personnel with exudative lesions or weeping dermatitis of the hands must refrain from all direct patient care and from handling patient care equipment until the condition resolves. [^A15]

### T40 — Personal protective equipment

Personal protective equipment (PPE) rules are absolute. Whenever there is potential for aerosol spray, splashing, or spattering, you must wear a surgical facemask in combination with either a chin-length plastic face shield or protective eyewear. Mask and eye protection are a single rule; choosing to wear one without the other is a violation. [^A15] 

Protective attire, such as a gown or clinic jacket, must be changed daily or between patients if it becomes moist or visibly soiled. It must be removed before you leave the patient-care or laboratory area. Medical exam gloves are worn for patient care and must be replaced for each patient or when torn. You must never wash gloves before or after use. For handling contaminated sharps and processing instruments, you must switch to heavy-duty utility gloves. [^A15] [^C2]

### T41 — Disease prevention protocols

Dental offices run on two distinct written safety programs, and the exam tests your ability to tell them apart. The Board requires a written infection-control protocol covering instrument processing, operatory cleanliness, and injury management, alongside a conspicuously posted copy of 16 CCR §1005. Cal/OSHA requires a written Exposure Control Plan that must be reviewed and updated at least annually. [^A15] [^A24]

Under Cal/OSHA, the employer must offer the hepatitis B vaccination at no cost within 10 working days of initial assignment for employees with occupational exposure. Training is required at initial assignment and at least annually thereafter. For sharps safety, needles must be recapped using only the one-handed scoop technique or a protective device. Needles must never be bent or broken for disposal, and every sharps injury must be recorded on the employer's Sharps Injury Log. [^A15] [^A24]

For surface disinfection, the universal rule is that cleaning must precede any disinfection process. Non-critical surfaces are cleaned and disinfected with a Cal/EPA-registered hospital disinfectant. If a surface is visibly contaminated with blood or other potentially infectious material, you must step up to an intermediate-level disinfectant with a tuberculocidal claim. [^A15]

### T42 — Medical emergencies

You are often the first person to notice a medical emergency, so the exam focuses on recognition and basic support. You must distinguish between a simple faint (syncope), which presents with pallor, cold sweat, and lightheadedness, and anaphylaxis, which involves the airway—swelling of the lips and tongue, hoarseness, and wheezing. [^C1]

Your role in an emergency is to stop the procedure, position the patient, clear and protect the airway, alert the dentist, and activate EMS if airway, breathing, or circulation is compromised. You bring the oxygen, emergency kit, and AED. Prescribing medication is excluded from dental assistant duties, and the exclusion applies to RDAs. [^C1] [^A4] [^A22] 

Emergency oxygen carries a specific supervision hook. BPC §1750.1(b)(18) allows an assistant, in response to a medical emergency, to administer or assist in the administration of oxygen under the direct supervision of the licensed dentist. The direct-supervision requirement is written into the duty text itself, so learn emergency oxygen as a direct, chairside duty. [^A4]

## Common traps

*   **Relaxing precautions for a "healthy" patient** → Standard precautions apply to every patient, every time, whatever the patient's disclosed or apparent health status. A healthy-looking patient never justifies skipping PPE. [^A15] [^C2]
*   **Washing exam gloves to save supplies** → The regulation explicitly states, "Gloves shall not be washed before or after use." [^A15]
*   **Bending a needle so it cannot be reused** → Bending or breaking needles for disposal is strictly prohibited. You must recap using the one-handed scoop technique or a mechanical device. [^A15] [^A24]
*   **Prescribing medication to a patient** → Prescribing medication is excluded from dental assistant duties, and the exclusion applies to RDAs. Your role in an emergency is to support the dentist: oxygen under the dentist's direct supervision, monitoring, and BLS. [^A4] [^A22]
*   **Assuming a one-year grace period for infection-control training** → The employer must ensure an unlicensed dental assistant has completed an infection-control course or examination *before* performing basic supportive procedures with potential exposure to blood, saliva or other potentially infectious materials. Since SB 1311 took effect on September 14, 2026, the options are the DANB Infection Control exam, a Board-approved 8-hour course, or a course of at least 4 hours of didactic and 2 hours of laboratory instruction offered by the California Dental Association or a CDA-, ADA CERP- or AGD PACE-approved provider. These options apply to assistants not enrolled in a Board-approved RDA or alternative program. Older study materials that name only the 8-hour course are out of date for this employment rule. RDA licensure is separate: applicants, other than RDH crossover applicants under §1752.1(d), still submit evidence of a Board-approved eight-hour infection-control course completed within two years before the application. [^A3] [^A32] [^B12] [^A7]

## Check yourself

Answer the original practice item, then take the free 15-question practice test to see every area.

## How to study this area

Subarea 3A is worth 15% of your exam, representing roughly 15 scored questions. Because this area is heavily anchored in state regulations, you must study the actual rules rather than relying on what you have seen done in a busy dental office. The exam tests the legal floor, and clinical shortcuts are common wrong answers. 

Allocate your study time to master the specific clocks, sequences, and boundaries established by the Dental Board and Cal/OSHA. 

1.  **Memorize the PPE and hand hygiene rules:** Know exactly when to use soap and water versus alcohol rub, and remember that masks and eye protection are always worn together.
2.  **Separate the two written plans:** Group the Board's infection-control protocol (instrument processing, operatory cleanliness) separately from Cal/OSHA's Exposure Control Plan (annual review, hepatitis B offer, sharps log).
3.  **Learn the scope limits in emergencies:** Memorize the signs of anaphylaxis versus syncope, and remember that prescribing medication is always a scope violation.

## Questions candidates ask

### Do I need an RDA license to take X-rays?
No. To operate dental radiographic equipment in California, you must complete a Board-approved radiation safety course and display the certificate at your facility. An unlicensed dental assistant with this course may legally expose radiographs. Standard RDA applicants must already have completed a Board-approved radiation safety course within 10 years before applying. [^A14] [^A3] [^A7]

### What is the passing score for the infection control section?
There is no fixed percentage you must hit for this section or the exam as a whole. The exam is pass/fail and criterion-referenced under 16 CCR §1081 using the modified Angoff standard-setting method. The Board publishes no fixed passing percentage or numeric score. [^A18]

### Can an RDA administer oxygen in a medical emergency?
Yes, within the duty's own terms. BPC §1750.1(b)(18) allows an assistant, in response to a medical emergency, to administer or assist in the administration of oxygen under the direct supervision, order, control, and full professional responsibility of the licensed dentist. An RDA may perform all duties a dental assistant is allowed to perform. [^A4] [^A8]

[^A3]: California Business & Professions Code §1750 — unlicensed dental assistant definition and employer training duties, as amended by SB 1311 (effective September 14, 2026). [California Business & Professions Code §1750](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1750.&lawCode=BPC)
[^A4]: California Business & Professions Code §1750.1 — basic supportive dental procedures delegable to unlicensed DAs (general- vs direct-supervision lists) and the never-delegable exclusions in subd. (d). [California Business & Professions Code §1750.1](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1750.1.&lawCode=BPC)
[^A8]: California Business & Professions Code §1752.4 — RDA duties and supervision levels, including the conflict in inherited duties. [California Business & Professions Code §1752.4](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1752.4.&lawCode=BPC)
[^A14]: California Business & Professions Code §1656 — dental radiography authorization. [California Business & Professions Code §1656](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1656.&lawCode=BPC)
[^A15]: 16 CCR §1005 — Minimum Standards for Infection Control. [16 CCR §1005](https://govt.westlaw.com/calregs/)
[^A18]: 16 CCR §1081 — RDA Combined Written and Law and Ethics Examination scoring and standard-setting. [16 CCR §1081](https://www.dbc.ca.gov/formspubs/da_exams_noara.pdf)
[^A24]: 8 CCR §5193 — Cal/OSHA Bloodborne Pathogens standard. [8 CCR §5193](https://www.dir.ca.gov/title8/5193.html)
[^B1]: Dental Board of California — Registered Dental Assistant Combined Written and Law and Ethics Examination Outline (2023). [Dental Board of California](https://www.dbc.ca.gov/formspubs/rda_exam_outline.pdf)
[^C1]: Bird DL, Robinson DS. Modern Dental Assisting. — clinical dental-assisting content for Areas 1–2 where no statute controls.
[^C2]: Centers for Disease Control and Prevention — Summary of Infection Prevention Practices in Dental Settings. [Centers for Disease Control and Prevention](https://www.cdc.gov/dental-infection-control/hcp/summary/index.html)

[^A7]: California Business & Professions Code §1752.1 — RDA licensure. [California Business & Professions Code §1752.1](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1752.1.&lawCode=BPC)

[^A22]: 16 CCR §§1085–1087 — Dental assisting duty regulations implementing the permitted-duties framework. [16 CCR §§1085–1087](https://govt.westlaw.com/calregs/)

[^A32]: California Business & Professions Code §1755 — Infection-control requirement for unlicensed dental assistants not enrolled in a Board-approved RDA or alternative program, as amended by SB 1311. [California Business & Professions Code §1755](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1755.&lawCode=BPC)

[^B12]: California Legislative Information, SB 1311 bill text — SB 1311, Chapter 232, Statutes of 2026. [California Legislative Information, SB 1311 bill text](https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202520260SB1311)

## Next step

[Take the free 15-question practice test](/rda/free-practice-test): every outline subarea, graded answers with reasons, and an area-by-area result. The full prep adds 10 study modules, 100 area-bank questions, a separate 100-item/144-minute practice set, and 4 review sheets. Price: $69 once, or $49 after you finish the free practice test. 180 days of access. [See what the full prep includes](/products/california-rda-exam).

Independent exam preparation. No Board endorsement or pass guarantee.

Independent educational preparation, not legal or clinical advice; not affiliated with or endorsed by the Dental Board of California or PSI. Confirm current requirements with the Dental Board of California.