Blood pressure categories explained for the CCMA

Blood pressure is the vital sign with the most moving parts: a classification table, a technique with a dozen error sources, five Korotkoff phases and a separate orthostatic procedure. The NHA CCMA exam tests all four, mostly inside Patient Intake and Vitals, which is 14 of 150 scored items. This post uses the blood pressure chapter of the NHA CCMA exam prep course and the current ACC/AHA categories as of 2026. It is a study aid, not clinical guidance; the provider, facility policy, state law and your training decide practice.

Paste any reading into the blood pressure category checker and it names the category using the rules below.

The four adult categories

Under the ACC/AHA guideline, which the 2025 update left unchanged, adults fall into one of four categories. Severe readings sit above them.

Read the middle column carefully, because it is where questions hide. Normal and Elevated need both numbers to qualify. Stage 1 and Stage 2 need only one. That means a reading whose two numbers land in different bands is classified by whichever band is higher. A reading of 128/84 is not Elevated even though 128 sits in the 120 to 129 band, because a diastolic of 84 meets the Stage 1 definition on its own. A reading of 118/92 is Stage 2 on the diastolic alone.

Two older cutoffs still show up as distractors. "Prehypertension" and a 140/90 line for hypertension come from the JNC7 system, and 140/90 is also the current European threshold. The ACC/AHA threshold for hypertension is 130/80.

Severe readings and what the MA does

A reading above 180 systolic and/or above 120 diastolic is severe. With no symptoms, CDC's advice is to contact the health care professional. With symptoms such as chest pain or trouble speaking, which point to organ damage, it is a hypertensive emergency and a 911 call. Exam stems often call anything above 180/120 a "hypertensive crisis", and the MA's action is the same either way: recheck, notify the provider immediately, and start the emergency response if the patient is symptomatic. The MA does not decide the diagnosis.

White-coat hypertension is a BP that is high in the office but not outside it. Masked hypertension is the reverse, normal in the office and high outside. Both show up only when office readings are compared with readings taken outside it, and automated office readings taken with the patient alone reduce the white-coat effect.

Korotkoff sounds

Auscultated BP relies on five sound phases as the cuff deflates over the brachial artery.

1. Phase 1: sudden sharp tapping. This is the systolic pressure.
2. Phase 2: swishing sounds.
3. Phase 3: regular, louder, crisper sounds.
4. Phase 4: abrupt muffling.
5. Phase 5: all sound disappears. This is the diastolic pressure in adults, and generally in children too.

An auscultatory gap is a silent stretch between phases 2 and 3. If you inflate only until the sounds stop and then listen, you can mistake the top of the gap for the diastolic or miss the true systolic. That is why the palpation step exists: inflate until the radial pulse disappears, then go at least 30 mm Hg higher before you start listening. Deflate at about 2 mm Hg per second, or per heartbeat when the rate is very slow. Faster than 2 to 3 mm Hg per second and the sounds become hard to read.

Oscillometric (electronic) devices read cuff oscillations instead of sounds, cannot tell phase 4 from phase 5, and need calibration on the manufacturer's schedule, for example every 1 to 2 years.

Cuff size and the error it causes

This is the single most tested technique fact. A cuff that is too small gives a falsely high reading. A cuff that is too large gives a falsely low reading. The AHA says the bladder should encircle 75 to 100 percent of the arm, and OpenStax gives a width of about 40 percent of arm circumference, so learn it as "the bladder wraps most of the arm" rather than one percentage. Very large arms need a correctly sized large or extra-large cuff, not a regular cuff pulled tight.

Placement: palpate the brachial artery in the antecubital fossa and center the bladder (the artery marker) over it on a bare upper arm, with the lower edge 2 to 3 cm above the fossa so there is room for the stethoscope. The cuff must be at heart level, the level of the right atrium, whether the patient is seated or lying down. Seated is preferred for routine readings.

Other technique errors

The AHA sorts BP error into three groups, and the exam borrows the list.

• Patient-related: recent food, caffeine, tobacco or exercise within 30 minutes, movement, a full bladder.
• Device-related: an uncalibrated or unvalidated device.
• Procedure-related: talking during the reading (by the patient or the MA), wrong cuff size, arm not at heart level, crossed legs, unsupported back or feet.

The fix is the standard setup: empty bladder, at least 5 minutes of quiet rest, back supported, feet flat, legs uncrossed, arm supported at heart level, sleeve not squeezing the arm, nobody talking. Take 2 or 3 readings 1 minute apart, because the first office reading is often higher than the ones that follow. Choose the arm by patient preference and skip an arm with an IV, lymphedema or a dialysis fistula. In children, use the right arm, because that is where pediatric normative data come from. When a reading does not fit the patient's trend, recheck in the other arm, recheck manually if the first reading was electronic, or let the patient rest 5 more minutes and try again.

Pulse pressure is systolic minus diastolic, about 40 mm Hg at 120/80, and it widens with age as arteries stiffen. If a question goes a step further into perfusion, the mean arterial pressure formula and the MAP calculator cover it.

Orthostatic blood pressure

Orthostatic readings check for a drop in pressure on standing, which matters for fall risk in older adults, and they belong to the CDC STEADI fall-prevention toolkit. The method:

1. The patient lies down for 5 minutes. Measure BP and pulse.
2. The patient stands.
3. Repeat BP and pulse after 1 minute of standing and again after 3 minutes.

The test is positive if systolic drops 20 mm Hg or more, or diastolic drops 10 mm Hg or more, or the patient feels lightheaded or dizzy. Older adults with hypertension can have an exaggerated drop because their baroreceptors respond poorly, which is a setup for syncope and falls. Watch the patient while they stand, because lightheadedness or dizziness is itself a positive result.

Worked examples

How to study this chapter

The table is a recall task, so build it with retrieval rather than rereading. Write five readings on a card, classify them cold, then check. That is the testing effect in practice, and the course's BP cards do the same job on a schedule. Technique errors are a cause-and-effect list, which pairs well with the other intake chapters in vital signs normal ranges for the CCMA. A pulse that will not settle during a BP recheck is sometimes an irregular rhythm, so how to calculate heart rate on an EKG strip is a natural next read. For the full domain layout, see NHA CCMA exam: what's on it, and for mixed items in exam style, the CCMA practice questions.