California RDA Exam Area 1A: Patient Information and Assessment

Patient Information and Assessment makes up 8% of the California Registered Dental Assistant Combined Written and Law and Ethics Examination. This area tests your ability to gather the medical and dental history, take vital signs, and perform a mouth-mirror inspection before the dentist begins treatment. Mastering this section means knowing both the clinical numbers you must record and the strict legal line between an assistant's observation and a dentist's diagnosis.

At a glance

What the exam expects you to know

T1 — Review patient medical and dental history

The history review is your screening step. You are looking for anything in the patient's health story that could change, delay, or endanger treatment. The assistant's role is to gather this information, chart it accurately, and alert the dentist. Deciding how a condition affects the treatment plan is a diagnostic decision reserved entirely for the dentist.³

You must recognize common medical conditions that alter dental appointments. Patients with diabetes are typically scheduled for morning appointments after a normal meal and medication to prevent low blood sugar in the chair.⁷ For patients with asthma, you must ensure their rescue inhaler is within reach.⁷ You must also document all medications, including over-the-counter drugs and supplements. Anticoagulants raise bleeding risks, while antihypertensives can cause orthostatic hypotension, which is a sudden drop in blood pressure when the patient sits up quickly.⁷

Antibiotic premedication is a core concept. It is used to prevent infective endocarditis in patients with the highest-risk cardiac conditions, such as prosthetic heart valves, a history of infective endocarditis, or a cardiac transplant with valve problems.⁷ Routine premedication is no longer generally recommended for most patients with prosthetic joints.⁷ Your operational duty is to verify that the patient actually took the prescribed dose before treatment begins. You may never select or prescribe the antibiotic, because prescribing medication is excluded from dental assistant duties, and that exclusion applies to RDAs.^{3 6}

Allergies and sensitivities require immediate action. Latex is the primary dental-material allergen, capable of causing reactions ranging from mild contact dermatitis to life-threatening anaphylaxis.⁷ A patient with a documented latex allergy requires a completely latex-safe setup, including non-latex gloves and a non-latex dental dam, and should ideally be scheduled as the first appointment of the day to minimize exposure to airborne latex proteins.⁷

Finally, the health history is a living document. It must be updated and dated at every single visit, not just filed away after the first appointment.⁷ However, you can never rely on the health history alone to screen out infectious diseases. Because patients may not know or disclose their status, standard precautions apply to every patient, all the time.^{8 9}

T2 — Obtain blood pressure and vital signs

Vital signs establish a baseline for the patient's current status. You must know the normal ranges for an adult: a pulse of 60 to 100 beats per minute, a respiration rate of 12 to 20 breaths per minute, and a temperature of approximately 98.6°F.⁷ Children normally have lower blood pressure and faster pulse and respiration rates than adults, which are judged against age-based norms rather than adult tables.⁷

You need the adult blood pressure categories. Normal is less than 120 systolic and less than 80 diastolic. Elevated is 120 to 129 systolic with a diastolic still under 80. Stage 1 hypertension is 130 to 139 systolic or 80 to 89 diastolic. Stage 2 hypertension is 140 or higher systolic or 90 or higher diastolic.⁷ A reading higher than 180 systolic and/or higher than 120 diastolic is a hypertensive crisis. At this level, elective dental treatment is halted, and the dentist is notified immediately.⁷

Technique matters because errors skew the numbers in predictable directions. Using a blood pressure cuff that is too small for the patient's arm will result in a falsely high reading, while a cuff that is too large will result in a falsely low reading.⁷ If you get an elevated reading, the correct protocol is to let the patient rest for a few minutes and recheck it, as anxiety or rushing can temporarily inflate the numbers.⁷

The supervision rules for vital signs depend on who is holding the cuff. For an unlicensed dental assistant, taking vital signs is a basic supportive procedure requiring direct supervision, meaning the dentist must be physically present in the treatment facility.³ For a Registered Dental Assistant, this duty is inherited through the authorization to perform all duties a dental assistant can perform. The Board's table places all inherited duties under general supervision for the RDA, but BPC §1750.1(b) lists taking vital signs among the direct-supervision duties, so the authorities are not harmonized for this inherited duty.^{3 4 5}

The same caution applies to every duty inherited from the unlicensed dental assistant list. For duties inherited through BPC §1752.4(a)(1), the legal authorities conflict. The statute at §1752.4(a) and the Board's January 2025 table point to general supervision, while §1750.1(b) and 16 CCR §§1085–1086 keep several at direct supervision. You must understand this conflict and never rely on a bright line for matrix placement, wedging, and removal, post-extraction dressing removal, periodontal dressing removal, or suture removal off-site. A January 2026 working-group proposal suggested keeping these specific duties at direct supervision, but that proposal is not law.^{3 4 5 10}

T3 — Perform mouth mirror inspection and chart findings

The mouth-mirror inspection is a signature RDA duty performed under general supervision.^{4 5} The law defines this duty precisely: it includes the charting of obvious lesions, existing restorations, and missing teeth.⁴ Your job is to conduct a systematic visual sweep of the oral cavity, use the mirror for indirect vision, light reflection, retraction, and transillumination, and record what you see.⁷

You must know the basic anatomy and tooth numbering systems to chart accurately. Humans have 20 primary teeth and 32 permanent teeth.⁷ You must also recognize occlusal relationships using Angle's classification. Class I is a normal molar relationship. Class II features a lower molar that is positioned too far back, giving a retruded appearance. Class III features a lower molar positioned too far forward, creating a protruded lower jaw.⁷

When inspecting the teeth, you must distinguish between different types of deposits and stains, because their removability dictates your scope of practice. Plaque is a soft biofilm that can be brushed or polished away. Extrinsic stains sit on the outside of the tooth and can also be polished off. Intrinsic stains, such as tetracycline banding or fluorosis, are inside the tooth structure and cannot be polished away.⁷ Calculus is mineralized plaque that requires professional scaling. Because coronal polishing is strictly limited to the removal of plaque and extrinsic stain, and scaling is not an authorized RDA duty, an assistant may never remove calculus.^{6 7}

You will also observe the effects of diet and substance use. Frequent exposure to fermentable carbohydrates drives dental caries, while acidic drinks cause enamel erosion.⁷ Tobacco use causes extrinsic staining, delays healing, and significantly raises the risk of oral cancer and periodontal disease. Smokeless tobacco creates distinct white, wrinkled lesions exactly where the user holds the chew.⁷ When you see these signs, you chart them factually by location and appearance. Telling the patient what the lesion is or what caused it crosses the line into diagnosis, which is strictly prohibited.³

Common traps

• Letting the RDA diagnose in a scenario -> The RDA charts obvious lesions and reports them to the dentist. Naming a condition for the patient, deciding a heart murmur needs no premedication, or judging that a medication "doesn't matter" is a diagnosis, which is never delegable to any assisting category.^{3 6}
• Treating the RDA supervision level for vital signs as settled -> Taking vital signs is a direct-supervision duty for an unlicensed dental assistant. An RDA inherits it, and §1752.4(a) and the Board table point to general supervision while §1750.1(b) keeps it direct, so read each question's stated facts instead of assuming a bright line.^{3 4 5}
• Removing calculus during a coronal polish -> Coronal polishing is legally defined as the removal of plaque and extrinsic stain. Calculus removal is scaling, and oral prophylaxis procedures are excluded for dental assistants and RDAs.^{6 7}
• Withholding standard precautions for a patient with a "clean" history -> Standard precautions apply to all patients, all the time, regardless of what the medical history says, because histories are inherently incomplete.^{8 9}
• Applying routine premedication for joint replacements -> Antibiotic prophylaxis is reserved for the highest-risk cardiac conditions, not routine joint replacements. The dentist decides unclear cases in consultation with the patient's physician.⁷
• Confusing Angle's Class II and Class III -> Class II means the lower molar is too far back (retruded). Class III means the lower molar is too far forward (protruded). These two are easy to swap.⁷

Check yourself

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

How to study this area

Patient Information and Assessment carries an 8% weight on the exam, which translates to roughly 8 of the 100 scored questions. Because this area blends clinical knowledge with strict legal boundaries, you should split your study time evenly between memorizing the clinical numbers and mastering the supervision rules.

Begin by locking in the vital sign ranges and blood pressure categories. You must know the exact thresholds for elevated blood pressure, stage 1, stage 2, and hypertensive crisis, as well as the predictable errors caused by incorrect cuff sizes. Next, study the Board's Table of Permitted Duties to understand exactly which assessment tasks you can perform and under what supervision level.

1. Memorize the numbers: Drill the adult normal ranges for pulse, respiration, and temperature, and the 120/130/140/180 blood pressure ladder.
2. Anchor the scope: Read BPC §1752.4 and the Board's duties table to confirm that mouth-mirror inspection is a general-supervision RDA duty.
3. Separate observation from diagnosis: Practice reading scenario questions with a strict filter. Any answer choice that has the assistant interpreting a finding, naming a disease, or prescribing a solution is legally incorrect.
4. Review the high-risk categories: Know the specific cardiac conditions that require antibiotic premedication and the protocol for managing a latex allergy.

Questions candidates ask

Can an RDA take vital signs if the dentist is not in the office?

The authorities do not settle it. An RDA may perform all dental assistant duties, and the Board's January 2025 table places those inherited duties under general supervision, but BPC §1750.1(b) lists taking vital signs as a direct-supervision duty. Under either level, the procedure is performed pursuant to the order, control, and full professional responsibility of the licensed dentist.^{11 3 4 5}

What blood pressure reading stops elective dental treatment?

A reading above 180 systolic and/or above 120 diastolic is considered a hypertensive crisis. At this threshold, elective dental treatment is halted, and the dentist must be notified immediately to evaluate the patient and determine if emergency medical care is necessary.⁷

Does an RDA need the dentist in the room to do a mouth-mirror inspection?

No. Mouth-mirror inspection of the oral cavity, which includes charting obvious lesions, existing restorations, and missing teeth, is an authorized RDA duty performed under general supervision. The dentist does not need to be physically present in the facility.^{4 5}

Can an assistant decide if a patient needs premedication?

No. Deciding whether a patient's medical condition requires antibiotic prophylaxis is a diagnostic and prescribing decision that belongs entirely to the dentist. The assistant's role is to flag the history, confirm with the patient whether they took the prescribed dose, and alert the dentist before treatment begins.^{3 7}

Footnotes

1. Dental Board of California — RDA Combined Written and Law and Ethics Examination Outline (2023). RDA Combined Written and Law and Ethics Examination Outline (2023) ↩ ↩²

2. PSI Services — 125 items (100 scored + 25 pretest). PSI Candidate Information Bulletin and test-taker portal ↩

3. 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 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

4. California Business & Professions Code §1752.4 — RDA duties and supervision levels. California Business & Professions Code §1752.4 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

5. Dental Board of California — Table of Dental Auxiliary Duties Delegable by Supervising Dentist. Dental Board of California ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

6. 16 CCR §§1085–1087 — Dental assisting duty regulations implementing the permitted-duties framework. 16 CCR §§1085–1087 ↩ ↩² ↩³ ↩⁴ ↩⁵

7. Bird DL, Robinson DS. Modern Dental Assisting. Current edition, Elsevier — clinical dental-assisting content for Areas 1–2 where no statute controls. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶

8. 16 CCR §1005 — Minimum Standards for Infection Control. 16 CCR §1005 ↩ ↩²

9. Centers for Disease Control and Prevention — Summary of Infection Prevention Practices in Dental Settings (2016). Summary of Infection Prevention Practices in Dental Settings ↩ ↩²

10. Dental Board of California — Dental Board of California, February 5–6, 2026 meeting materials, Agenda Item 25.b. Dental Board of California ↩

11. California Business & Professions Code §§1740–1742 — dental auxiliaries article opening: legislative intent and definitions, including direct supervision (§1741(k)) and general supervision (§1741(l)). California Business & Professions Code §1741 ↩