2.7 Risk Assessment Instruments Beyond Braden: Norton, Braden Q, Braden QD, Wagner, and University of Texas
Key Takeaways
- Blueprint objective 1.07 names six instruments — Braden, Braden Q, Braden QD, Norton, Wagner, and the University of Texas Diabetic Foot Scale — so knowing only the Braden Scale leaves most of this objective uncovered.
- The Norton Scale scores five subscales from 1 to 4 for a total of 5 to 20, with lower scores indicating higher risk; a score of 14 or below is the commonly used at-risk threshold.
- The Braden Q adds tissue perfusion and oxygenation to the adult Braden subscales for a pediatric total of 7 to 28, with 16 or below indicating risk.
- The Braden QD extends risk scoring to medical device-related injury with a total range of 0 to 20, where a score of 13 or above identifies the at-risk patient — the scoring direction is inverted relative to every other Braden tool.
- The University of Texas system outperforms Wagner for predicting amputation because it grades depth on one axis and grades infection and ischemia separately on the other, which Wagner conflates.
Risk Assessment Instruments Beyond Braden
Section 2.3 covered the Braden Scale in depth. Objective 1.07, however, names six instruments: Braden, Braden Q, Braden QD, Norton, Wagner, and the University of Texas Diabetic Foot Scale. Exam items in this objective typically supply a patient of a specific age or diagnosis and ask which tool applies, or supply a score and ask what it means. The traps are the scoring direction and the population each tool was validated in.
1. The Norton Scale — the original adult pressure risk tool
Developed by Doreen Norton in 1962, this is the oldest pressure injury risk instrument still in use, and it remains common in the United Kingdom and in some long-term care settings.
Five subscales, each scored 1 (worst) to 4 (best):
- Physical condition — good, fair, poor, very bad
- Mental condition — alert, apathetic, confused, stuporous
- Activity — ambulant, walks with help, chairbound, bedbound
- Mobility — full, slightly limited, very limited, immobile
- Incontinence — none, occasional, usually urinary, urinary and fecal
Total range: 5 to 20. As with Braden, lower means higher risk. The widely used threshold is 14 or below indicates risk, with below 12 indicating high risk; some institutions set the onset of risk at 16.
Norton versus Braden: Norton is faster and simpler, but it omits nutrition and does not separate friction and shear from mobility — two of the strongest predictors — which is why Braden displaced it as the dominant instrument in the United States. Norton is more sensitive but less specific, generating more false positives.
2. The Braden Q — pediatric pressure risk
The Braden Q adapts the adult Braden Scale for children, validated for patients from roughly 21 days to 8 years.
Seven subscales, each scored 1 to 4:
- The three intensity and duration of pressure subscales: mobility, activity, sensory perception
- The three tissue tolerance subscales: moisture, friction and shear, nutrition
- Plus the pediatric addition: tissue perfusion and oxygenation
That seventh subscale is the point of the tool. Critically ill children are frequently hemodynamically unstable, hypoxemic, or on vasopressors, and perfusion status is a stronger driver of pediatric pressure injury than it is in ambulatory adults.
Total range: 7 to 28. Lower means higher risk. A score of 16 or below indicates at-risk.
3. The Braden QD — pediatric plus medical device risk
The Braden QD was developed to address the fact that the majority of pediatric and neonatal pressure injuries are device-related, which no earlier tool scored. It was validated across a wide pediatric range, from premature neonates through age 21, in both ICU and non-ICU settings.
It comprises seven subscales: five immobility-related items (drawn from the Braden Q concepts of mobility, sensory perception, friction and shear, nutrition, and tissue perfusion and oxygenation) plus two device-related items:
- The number of medical devices in contact with the skin
- The repositionability of those devices and the skin protection applied beneath them
Total range: 0 to 20.
The direction trap: on the Braden QD, a higher score means higher risk, and the at-risk threshold is 13 or above. This is the inverse of the Braden Scale and the Braden Q, where lower is worse. Exam items exploit this reversal, so anchor it: Braden and Braden Q go down toward danger; Braden QD counts devices upward.
4. The Wagner (Wagner-Meggitt) Diabetic Foot Classification
A single-axis depth and necrosis grading system, and still the most widely cited diabetic foot scale:
| Grade | Description |
|---|---|
| 0 | Intact skin — no open lesion; may have a deformity, callus, or a healed prior ulcer (a pre-ulcerative or at-risk foot) |
| 1 | Superficial ulcer, not extending into deeper tissue |
| 2 | Deep ulcer penetrating to tendon, capsule, or bone, without abscess or osteomyelitis |
| 3 | Deep ulcer with abscess, osteomyelitis, or joint sepsis |
| 4 | Localized gangrene — forefoot or heel |
| 5 | Gangrene of the entire foot, requiring major amputation |
Wagner appears throughout wound care because coverage criteria reference it — hyperbaric oxygen therapy is a covered benefit for Wagner Grade 3 or higher diabetic foot ulcers that have failed standard therapy.
Its weakness: Wagner conflates depth, infection, and ischemia onto one axis. A clean, well-perfused deep ulcer and an ischemic infected deep ulcer can both be graded 2 or 3, yet they carry entirely different amputation risks.
5. The University of Texas Diabetic Wound Classification
The University of Texas (UT) system resolves Wagner's weakness with a two-axis grid. Depth runs across the grades; infection and ischemia run down the stages.
Grade (depth):
- 0 — pre-ulcerative or post-ulcerative site, fully epithelialized
- 1 — superficial wound not involving tendon, capsule, or bone
- 2 — wound penetrating to tendon or capsule
- 3 — wound penetrating to bone or joint
Stage (complication):
- A — clean wound: no infection, no ischemia
- B — infection present
- C — ischemia present
- D — infection and ischemia both present
A wound is reported as a grade-and-stage pair: "UT 2B" is a wound to tendon or capsule with infection; "UT 3D" is a wound to bone with both infection and ischemia.
Why the exam prefers UT: risk of amputation rises predictably as you move right across grades and down through stages, and validation studies show UT predicts outcome more accurately than Wagner precisely because infection and ischemia are graded independently. A UT 1A heals reliably; a UT 3D carries a very high amputation risk.
6. Matching the tool to the patient
The single most common exam error in this objective is applying an adult pressure tool to a child, or a pressure tool to a diabetic foot. Anchor the mapping:
- Adult pressure injury risk → Braden (or Norton where institutional policy specifies it)
- Pediatric pressure injury risk → Braden Q
- Neonatal or device-heavy pediatric risk → Braden QD
- Diabetic foot ulcer severity → Wagner (depth and gangrene) or, preferably, University of Texas (depth plus infection and ischemia)
Objective 7.02 then closes the loop: the score is not the deliverable. Using the risk assessment findings to select preventative measures is. A Braden of 12 driven by a moisture subscale of 1 calls for an incontinence protocol and barrier products; the same total driven by a mobility subscale of 1 calls for an active support surface and a turning schedule.
| Instrument | Population | Subscales / Axes | Score Range | Risk Direction | At-Risk Threshold |
|---|---|---|---|---|---|
| Braden | Adults | 6 (five 1–4, friction/shear 1–3) | 6 – 23 | Lower = higher risk | ≤ 18 at risk; ≤ 9 very high |
| Norton | Adults | 5, each 1–4 | 5 – 20 | Lower = higher risk | ≤ 14 at risk; < 12 high risk |
| Braden Q | Children ~21 days – 8 years | 7, each 1–4 (adds tissue perfusion/oxygenation) | 7 – 28 | Lower = higher risk | ≤ 16 at risk |
| Braden QD | Neonates (premature) through age 21 | 7 subscales: 5 immobility items + 2 medical device items | 0 – 20 | Higher = higher risk | ≥ 13 at risk |
| Wagner | Diabetic foot ulcer | Single axis: depth and gangrene | Grade 0 – 5 | Higher = more severe | Grade 3+ qualifies for HBOT consideration |
| University of Texas | Diabetic foot ulcer | Two axes: Grade 0–3 depth × Stage A–D | 0A – 3D | Right and down = worse | 3D carries the highest amputation risk |
A 2-week-old neonate in the cardiac ICU has an endotracheal tube, a nasogastric tube, two pulse oximeter probes, and an arterial line. The unit uses the Braden QD Scale and documents a score of 17. What does this indicate?
A patient with diabetes has a plantar ulcer that probes to tendon. There is purulent drainage and surrounding cellulitis, and the ABI is 0.42 with absent pedal pulses. How is this wound classified in the University of Texas system?
Which limitation of the Norton Scale led most United States facilities to adopt the Braden Scale instead for adult pressure injury risk assessment?