Why Pressure Injury Stages Show Up on Every NCLEX

Pressure injuries touch almost every NCLEX client needs category: skin assessment, mobility, nutrition, delegation, documentation, safety. One question about a reddened sacrum can quietly test all of them.

This guide walks through the pressure injury stages as defined by the National Pressure Injury Advisory Panel (NPIAP), the Braden Scale, prevention, basic treatment by stage, and the documentation rule that catches students every single year.

In 2016 the NPIAP (then the NPUAP) switched from “pressure ulcer” to “pressure injury,” since Stage 1 and deep tissue injuries occur on intact skin. You will still see “pressure ulcer,” “bedsore,” and “decubitus ulcer” in older questions and resources like MedlinePlus. They all point to the same thing.

What Causes a Pressure Injury?

Pressure squeezes capillaries shut between a bony prominence and a surface. No blood flow means no oxygen, and tissue starts dying. Muscle and fat near the bone are actually more sensitive to that ischemia than skin, which is why damage can be worse underneath than it looks on top.

Three forces do the work:

• Pressure: the main driver, especially over the sacrum, coccyx, heels, ischial tuberosities, greater trochanters, occiput, and elbows.
• Shear: skin stays put while deeper tissue slides. Think of a client sliding down in bed with the head elevated.
• Friction: skin rubbing against sheets during dragging or poor transfers.

Moisture from incontinence or sweat softens skin and makes all three worse. Poor nutrition removes the raw materials for repair.

The NPIAP Pressure Injury Stages

Stage 1: The Blanch Test Decides It

Press on a red area with your finger, then release. If the color returns to pale and then pink, it blanches, and capillary refill is intact. If it stays red, it is nonblanchable, and that is a Stage 1.

In clients with darker skin tones, redness may be hard to see. The area can look purplish, bluish, or just darker than surrounding skin. Rely on touch: is it warmer or cooler, firmer or boggier, painful? The NCLEX has started weaving this into questions about equitable assessment.

Stage 2 vs. Everything That Looks Like Stage 2

A Stage 2 is a shallow, clean, pink, moist wound or a serum-filled blister. Simple enough. The trick is what it is not.

The NPIAP is clear that Stage 2 should not describe moisture-associated skin damage (MASD), incontinence-associated dermatitis (IAD), intertriginous dermatitis, skin tears, burns, or medical adhesive related skin injury. Those are different wounds with different causes. If the stem describes diffuse, shiny redness in the perineal folds of a client with chronic diarrhea, that is IAD, not a pressure injury.

Unstageable: Not “Mild,” Just Hidden

Unstageable is not a minor category. By definition it is full thickness; you just cannot see how deep until the slough or eschar is removed.

One big exception: stable eschar on the heel or an ischemic limb (dry, adherent, intact, no redness or drainage around it) should not be softened or removed. It acts as the body’s natural biological cover. If that eschar becomes soft, boggy, draining, or red around the edges, notify the provider.

Deep Tissue Pressure Injury

A DTPI is damage at the bone and muscle interface that surfaces as a purple or maroon bruise-like area or blood-filled blister, often 24 to 72 hours after intense pressure (a long surgery, a client found down at home). It can evolve into a Stage 3 or 4 even with good care, so offload it completely and monitor closely.

Medical Device Related and Mucosal Membrane Injuries

These two definitions describe a cause, not a depth.

• Medical device related pressure injury (MDRPI): takes the shape of the device. Common culprits are nasal cannula tubing behind the ears, BiPAP masks across the nose bridge, endotracheal tube holders, cervical collars, casts, and SpO2 probes. These ARE staged with the regular staging system.
• Mucosal membrane pressure injury: found on mucous membranes where a device sat, like the lips or tongue from an ET tube, or the nares from an NG tube. These are NOT staged, because mucosa does not have the same tissue layers as skin.

The Braden Scale: Scoring Risk

The Braden Scale is the most widely used pressure injury risk tool in US hospitals, and it is one of the risk scales included in the AHRQ Preventing Pressure Ulcers in Hospitals toolkit. It scores six categories. Five are scored 1 to 4, and friction and shear is scored 1 to 3.

• Sensory perception
• Moisture
• Activity
• Mobility
• Nutrition
• Friction and shear

Total score range is 6 to 23. Lower score means higher risk.

The commonly taught NCLEX cutoff is 18 or below = at risk. Sources vary a little: some use 16 as the at-risk line for younger adults, and some textbooks label 12 or below as “high risk” without the other bands. If a question gives you a number, compare it against 18 first.

Assess Braden on admission, then per policy (often every shift or daily) and with any change in condition. The admission skin check also documents what was present on arrival, which matters because a hospital-acquired Stage 3 or 4 is a serious reportable event.

Prevention: Where the Points Are

Most pressure injury questions are really prevention questions. These interventions come up again and again, and they tie directly into the mobility, immobility, and positioning lesson.

Repositioning

• Turn a bedbound client at least every 2 hours. Guidelines now individualize this, but every 2 hours is the exam answer.
• Clients in a chair: reposition at least every hour. If able, they shift weight about every 15 minutes.
• Use a 30-degree lateral tilt instead of lying directly on the trochanter.
• Keep the head of the bed at 30 degrees or lower unless contraindicated (tube feeding, respiratory distress, aspiration risk). Higher angles increase sacral shear.
• Float the heels off the bed with a pillow under the calves or a heel offloading boot.
• Use a lift sheet. Never drag the client up in bed.

Support Surfaces

High-risk clients get a pressure-redistribution mattress or overlay. Low air loss and alternating pressure surfaces are common for those already injured or at very high risk. A special mattress does not replace turning. The NCLEX will offer that as a tempting wrong answer.

Moisture and Skin Care

• Clean promptly after incontinence with a pH-balanced cleanser, pat dry, and apply a moisture barrier.
• Limit layers of linen and pads under the client, which trap heat and reduce the mattress’s effect.

Much of this is basic hygiene, which is why it overlaps heavily with the activities of daily living and personal hygiene lesson.

Nutrition and Hydration

Wounds need protein, calories, fluid, vitamin C, and zinc. Watch weight trends and intake, and involve the dietitian early. Albumin and prealbumin still appear in questions, though both drop with inflammation and are no longer considered pure nutrition markers. Review typical ranges in our NCLEX lab values guide, and see the nutrition and oral hydration lesson for diet details.

Treatment Basics by Stage

You do not need to run a wound clinic, just know the principles: offload pressure, keep a clean wound moist, remove dead tissue, manage drainage, and protect the surrounding skin. The wound care and surgical recovery lesson covers dressing types in more depth.

• Stage 1: remove pressure, protect the skin. A transparent film or thin foam can reduce friction. Reassess often.
• Stage 2: keep the wound bed moist and clean. Normal saline cleansing, then a hydrocolloid or foam dressing. Avoid hydrocolloids on infected wounds.
• Stage 3 and 4: clean with saline, loosely fill dead space (tunneling, undermining) with packing or an alginate for heavy drainage, consider negative pressure wound therapy per provider order, and loop in the wound care nurse and dietitian. Watch Stage 4 wounds for signs of osteomyelitis.
• Unstageable: debridement is usually needed to see the base. Exception: stable heel eschar stays put.
• DTPI: complete offloading and close monitoring. Do not massage. Document color, size, and any changes.

For clean, granulating wounds, avoid routinely using hydrogen peroxide or povidone-iodine, which can damage healthy new tissue. Saline is the safe default answer. Signs of infection (increased redness, warmth, purulent drainage, odor, fever, rising pain) need provider notification. The StatPearls review on pressure injuries is a good deeper read on complications and management.

Documentation: Never Reverse Stage

This is the single most tested documentation rule for pressure injury stages. Memorize it.

A pressure injury keeps its deepest stage forever. When a Stage 4 fills in with pink granulation tissue, it does not become a Stage 3 and then a Stage 2. It is a healing Stage 4. When it closes, it is a healed Stage 4. Granulation tissue fills the defect and matures into scar tissue. It does not rebuild the muscle, fat, and dermis that were lost, and the healed area stays weaker than the original skin.

What to document with every wound assessment:

• Location and stage (using the deepest stage ever reached)
• Size in centimeters: length (head to toe), width (side to side), and depth
• Tunneling or undermining, using the clock method (12 o’clock points toward the client’s head)
• Wound bed: percentage of granulation, slough, or eschar
• Drainage amount, color, and odor
• Edges and surrounding skin (redness, maceration, induration)
• Pain and the client’s response to care

One clarification: an unstageable wound that gets debrided is then staged by what you see. Unstageable to Stage 4 is not reverse staging; it is finally seeing the depth.

NCLEX Traps to Watch For

Where students lose points:

1. Reverse staging. Any answer that downgrades a healing wound is wrong.
2. Massage, donuts, and high head of bed. All sound comforting. All increase harm.
3. Calling purple skin a Stage 1. That is a DTPI until proven otherwise.
4. Staging a wound covered in slough. If you cannot see the base, it is unstageable.
5. Staging IAD or a skin tear as Stage 2. Different cause, different wound.
6. Removing stable heel eschar. Leave it alone unless it shows signs of infection.
7. “The special bed handles it.” Support surfaces add to turning. They never replace it.
8. Forgetting devices. Check under the cannula, the BP cuff, the cervical collar, and the SpO2 probe.

If a question asks what the nurse should do first when a reddened area is found, think assess and offload before you think dressing. Our prioritization and delegation guide breaks down how to pick the first action. For another skin-focused topic with its own set of traps, see the rule of nines burns guide.

Want more like this? Work through practice sets in the Proving Grounds practice exams, or keep a one-page summary handy from our NCLEX cheat sheets.

Final Takeaway

Pressure injury stages come down to depth and visibility. Intact red skin that will not blanch is Stage 1. Exposed dermis is Stage 2. Fat is Stage 3. Bone, tendon, or muscle is Stage 4. Hidden base is unstageable, and purple or maroon intact skin is a deep tissue injury.

Then layer on the nursing: score Braden (18 or below means at risk), turn every 2 hours, keep the head of the bed at 30 degrees or less, float heels, manage moisture, feed the wound, and never, ever reverse stage. If you remember that prevention is the priority and the RN owns assessment, you will pick the right answer on most of these questions. For the bigger picture of comfort and hygiene topics, the Basic Care and Comfort course pulls it all together.

Train like a black belt. Think like a nurse. 🥋

FAQ: Pressure Injury Stages