Peripheral Oedema Assessment for Student Nurses
Learn how to assess peripheral oedema, describe the distribution of swelling and recognise when changes may form part of a wider fluid, cardiovascular or deterioration picture.
What is peripheral oedema?
Peripheral oedema is swelling caused by fluid accumulating within the tissues. It is commonly noticed in the feet, ankles and lower legs but can affect other parts of the body depending on the cause and the patient's position.
Where is it?
Establish whether swelling affects one limb, both limbs or is more widespread.
Is it changing?
Compare the finding with previous documentation and the patient's usual baseline.
What else is happening?
Fluid balance, breathing, circulation, mobility and clinical history all influence interpretation.
How to assess peripheral oedema
Observe before touching
Look for visible swelling, changes in symmetry, skin tension, colour or obvious discomfort.
Identify distribution
Establish whether the swelling is unilateral, bilateral or generalised.
Compare sides
Where appropriate, compare corresponding limbs for differences in swelling, colour and temperature.
Assess pitting if appropriate
Follow local clinical teaching when assessing whether pressure leaves a temporary indentation in swollen tissue.
Review the skin
Look for redness, tightness, tenderness, leakage, breakdown or other changes requiring attention.
Assess the wider picture
Review breathing, oxygenation, fluid balance, urine output, weight trends and circulation where relevant.
Describe rather than diagnose
“New bilateral ankle swelling extending to the lower calves” gives much more useful information than simply writing “oedema present.”
Unilateral and bilateral swelling are not the same
| Pattern | What you may notice | Clinical thinking |
|---|---|---|
| Unilateral swelling | One leg or limb appears more swollen than the other. | New one-sided swelling may have causes different from general fluid accumulation and should be communicated appropriately. |
| Bilateral swelling | Both ankles, feet or legs are swollen. | Consider fluid status, mobility, cardiovascular history and whether the swelling is new or chronic. |
| Dependent oedema | Swelling develops in areas affected by gravity. | Position and mobility can influence where fluid accumulates. |
| Generalised swelling | Oedema affects several body areas. | More widespread swelling warrants assessment of the broader clinical and fluid-status picture. |
Ask: is this new?
Chronic ankle swelling documented for months is different from rapidly increasing oedema that has appeared during the current admission. Change from baseline is clinically important.
Oedema can affect skin integrity
Swollen tissue may become stretched and vulnerable. Assessment should therefore include the condition of the skin as well as the degree and distribution of swelling.
- Look for tight or shiny skin.
- Assess for redness or unusual colour change.
- Ask about pain, tenderness or discomfort.
- Look for leaking fluid or wet skin.
- Check for wounds, pressure damage or skin breakdown.
- Consider how swelling affects footwear, mobility and comfort.
- Report new or worsening skin concerns appropriately.
Protect dignity and comfort
Explain what you are assessing, expose only the area required and reposition or cover the patient promptly after the assessment.
When oedema and breathlessness occur together
Peripheral swelling becomes more concerning when accompanied by respiratory deterioration or evidence of changing fluid status.
Respiratory rate
Assess whether respiratory rate or work of breathing has increased.
SpOâ‚‚ and oxygen therapy
Review saturation, target range and whether oxygen requirements have changed.
Balance and weight
Review fluid balance and weight trends where these are clinically relevant and available.
Putting the findings together
Example
During morning care you notice that a patient's ankles are more swollen than the previous day.
The swelling is present on both sides and now extends further up the lower legs.
The patient also reports increasing breathlessness, and their respiratory rate is higher than on the previous observation set.
Their fluid balance has been positive during the last 24 hours.
The concern is the combined change in oedema, fluid status and respiratory condition.
As a student nurse, describe the swelling accurately, obtain relevant observations and communicate the change promptly to the appropriate registered practitioner.
Oedema assessment errors to avoid
- Writing only “oedema present.” Describe location, distribution and change.
- Assuming all oedema is caused by fluid overload. Swelling has multiple possible causes.
- Ignoring asymmetry. New unilateral swelling deserves attention.
- Ignoring skin condition. Swollen tissues may be vulnerable to damage.
- Assessing oedema without reviewing breathing. Respiratory deterioration may be the more urgent issue.
- Failing to compare with baseline. Establish whether swelling is new, chronic or increasing.
Recognise → assess → communicate → escalate
Notice swelling
Identify new, increasing, unilateral or widespread oedema and any associated skin changes.
Build the picture
Review breathing, circulation, fluid balance, urine output, weight and relevant clinical history.
Describe clearly
Explain where the swelling is, how it has changed and what other symptoms or observations are present.
Recognising Poor Peripheral Perfusion for Student Nurses
Learn how to recognise cool skin, pallor, delayed capillary refill and weak peripheral pulses, and connect these findings with the wider circulation assessment.
Continue to Poor Peripheral Perfusion →