Introduction
Pressure injuries remain one of the most common, and most preventable, complications nurses encounter, and getting the staging right genuinely matters — it guides treatment, drives documentation accuracy, and factors into hospital quality reporting. Because staging can be tricky, especially in darker skin tones or when wounds are obscured by slough, this is a skill worth revisiting even for experienced nurses. This guide breaks down the NPIAP staging system and the prevention framework that keeps injuries from happening in the first place.
Table of Contents
- What Is a Pressure Injury?
- Risk Factors
- The Braden Scale
- NPIAP Staging System
- Special Categories: Unstageable and DTPI
- Nursing Assessment
- Prevention
- Documentation
- Complications
- NCLEX Tips and Memory Tricks
- Clinical Pearls
- Key Takeaways
- FAQs
- References
What Is a Pressure Injury?
The National Pressure Injury Advisory Panel (NPIAP) defines a pressure injury as localized damage to the skin and underlying soft tissue, usually over a bony prominence or related to a medical or other device. Pressure injuries can present as intact or open skin, and can range from shallow to deep — sustained or intense pressure compromises blood flow and reduces sensation to the affected area, which is what ultimately drives tissue damage.
Risk Factors
- Prolonged immobility
- Older age
- Certain medication use
- Co-existing health conditions affecting perfusion or sensation
- Incontinence and moisture exposure
- Poor nutritional status
- Reduced ability to reposition independently
The Braden Scale
A structured risk assessment tool, most commonly the Braden scale, should be used to identify patients at risk for pressure injury as soon as possible after admission. This matters because it flags patients who will benefit from preventive measures and highlights potentially correctable contributing factors. Risk assessment shouldn’t be a one-time event — repeat it at regular intervals and with any change in the patient’s condition, and build the care plan directly around what the assessment identifies.
NPIAP Staging System
| Stage | Description |
|---|---|
| Stage 1 | Non-blanchable erythema of intact skin |
| Stage 2 | Partial-thickness skin loss |
| Stage 3 | Full-thickness skin loss, potentially extending into subcutaneous tissue; fascia, muscle, tendon, ligament, cartilage, and bone are not exposed |
| Stage 4 | Full-thickness skin and tissue loss with exposed fascia, muscle, tendon, ligament, cartilage, or bone; epibole, undermining, and tunneling often occur |
Wounds should be staged based on the deepest visible tissue involved, and staging describes the tissue itself, not the overall severity of the patient’s condition.
Special Categories: Unstageable and DTPI
- Unstageable pressure injury — full-thickness skin and tissue loss where the actual depth is obscured by slough or eschar, meaning true depth can’t be determined until that tissue is removed or the wound is otherwise fully visualized
- Deep tissue pressure injury (DTPI) — persistent, non-blanchable deep red, maroon, or purple discoloration, or a blood-filled blister, resulting from damage to underlying soft tissue; a key distinguishing point is that this does not include purple or maroon color changes from other causes, since those may indicate deep tissue injury of a different origin
- Medical device-related pressure injuries — generally take the shape or pattern of the device causing them, and are staged using the same NPIAP system when they occur on skin; injuries on mucous membranes from prior device use, however, cannot be staged using this system due to differences in mucosal tissue anatomy
Nursing Assessment
- Inspect the entire skin surface as soon as possible on admission, with particular attention to non-blanchable erythema
- Assess for pressure ulcers, excoriation, rashes, and other skin changes across the full body, not just high-risk bony prominences
- In patients with darker skin tones, rely on temperature, texture, and induration changes in addition to color, since redness can be harder to visualize — a warm or cool area compared to surrounding tissue can be a meaningful early sign
- Cleanse skin promptly after episodes of incontinence, using pH-balanced cleansers and avoiding hot water, which can further compromise skin integrity
- Document findings clearly and consistently at each assessment
Prevention
- Use a structured, validated risk assessment tool (such as the Braden scale) for every at-risk patient, repeated regularly
- Build an individualized care plan based on identified risk factors, prioritizing addressable issues
- Reposition patients on a regular schedule appropriate to their risk level
- Use appropriate support surfaces for patients at elevated risk
- Manage moisture and incontinence proactively rather than reactively
- Ensure adequate nutritional support, since poor nutrition status is a meaningful, correctable risk factor
Documentation
- Document the specific stage using NPIAP terminology consistently
- Include location, size, and any undermining, tunneling, or exudate present
- Note whether the injury was present on admission or developed during the stay, since this distinction carries real clinical and quality-reporting significance
- Photograph per facility protocol to support objective tracking over time
- Reassess and re-document at intervals specified by facility policy, since staging can change as a wound evolves
Complications
- Infection, including potential progression to cellulitis or osteomyelitis in deep injuries
- Pain, which can be significant even in earlier-stage injuries
- Prolonged hospital stay and increased care complexity
- Sepsis, in severe, untreated cases
- Significant impact on quality of life, particularly for patients with chronic, non-healing wounds
NCLEX Tips and Memory Tricks
- Stage 1 = intact skin, non-blanchable redness. Stage 2 = partial-thickness loss. These two are the most frequently confused on exams — remember Stage 1 skin is still intact.
- Stage 3 vs. Stage 4 hinges on exposed structures — muscle, tendon, ligament, cartilage, or bone visible means Stage 4, not Stage 3.
- If a wound’s true depth can’t be determined because it’s covered by slough or eschar, it’s unstageable — this is a distinct category, not a “worse Stage 4.”
- Mnemonic — “STAGE”: Skin intact but red = Stage 1, Tissue partial loss = Stage 2, All layers lost = Stage 3, Gone to muscle/bone = Stage 4, Extent unknown = unstageable/DTPI.
Clinical Pearls
- In patients with darker skin tones, non-blanchable erythema can be genuinely difficult to detect visually — temperature and texture changes deserve equal weight in your assessment, not just color.
- Don’t confuse DTPI-related discoloration with other causes of purple or maroon skin color changes — the distinction matters for accurate staging and appropriate treatment.
- Because staging describes the tissue and not overall severity, a Stage 2 injury can still be quite painful and clinically significant — don’t let the “lower number” create false reassurance.
Key Takeaways
- NPIAP staging (1–4, unstageable, DTPI) categorizes pressure injuries by depth and tissue involvement, guiding treatment decisions.
- The Braden scale identifies at-risk patients on admission and should be reassessed regularly and with any status change.
- Darker skin tones require additional assessment cues beyond visible redness — temperature and texture changes matter.
- Prevention through structured risk assessment, repositioning, and moisture management remains more effective than treating established injuries.
FAQs
What are the stages of a pressure injury?
Stage 1 (non-blanchable erythema, intact skin), Stage 2 (partial-thickness skin loss), Stage 3 (full-thickness skin loss), Stage 4 (full-thickness tissue loss with exposed muscle, tendon, or bone), plus unstageable and deep tissue pressure injury (DTPI) categories.
What is the difference between a stage 3 and stage 4 pressure injury?
Stage 3 involves full-thickness skin loss without exposed fascia, muscle, tendon, ligament, cartilage, or bone. Stage 4 involves exposure of these deeper structures.
What is an unstageable pressure injury?
A full-thickness injury where the true depth can’t be determined because slough or eschar obscures the wound bed.
What is a deep tissue pressure injury?
Persistent non-blanchable deep red, maroon, or purple discoloration of intact or non-intact skin, or a blood-filled blister, reflecting damage to underlying soft tissue.
How often should the Braden scale be reassessed?
At regular intervals per facility protocol, and always with any significant change in the patient’s condition.
References
- Nursing2026 (Wolters Kluwer/NursingCenter) — Pressure Injury Assessment and Management (2026)
- Nursing CE Central — Pressure Injury Prevention, Staging, and Treatment
- National Pressure Injury Advisory Panel (NPIAP) — Guidelines and Resources
- PMC — Patient-Reported Outcome and Experience Measures in Pressure Injury Prevention and Care: A Scoping Review
RELATED ARTICLES: