Pitting vs non-pitting oedema: causes, grading and nursing priorities

Press, release and watch the rebound

To assess oedema, press firmly over a bony area such as the shin, ankle or top of the foot for a few seconds, then release. If an indentation remains, the oedema is pitting; if the skin springs back with no dent, it is non-pitting. Compare both sides, because unilateral and bilateral swelling point toward different causes.

Pitting oedema is graded on depth and how long the dent takes to rebound. A common scale runs from 1+, a barely detectable depression that rebounds immediately, to 4+, a deep depression that takes longer than about 20 seconds to recover. Scales vary between facilities, so use the local tool consistently and document the site measured.

Link pitting oedema to its common mechanisms

Pitting oedema usually reflects free fluid pushed into the tissues. Raised capillary pressure occurs in heart failure and venous obstruction, and reduced plasma oncotic pressure from low albumin occurs in nephrotic syndrome, cirrhosis and malnutrition. Excess sodium intake and some medicines can also contribute. Generalised pitting oedema suggests a systemic cause such as heart, kidney or liver disease.

Unilateral pitting oedema of one leg, especially with warmth, redness or calf pain, raises concern for deep vein thrombosis and should be reported promptly rather than simply elevated. Chronic venous insufficiency may affect one or both legs and often comes with skin discolouration. The pattern matters as much as whether the oedema pits.

Recognise when oedema does not pit

Non-pitting oedema develops when fluid is trapped with protein or within tissue that has become firm. Lymphoedema is pitting in its early stage but becomes non-pitting as chronic inflammation causes fibrosis, eventually giving a thick, brawny texture. Myxoedema associated with hypothyroidism is another classic non-pitting swelling, caused by mucopolysaccharide deposits in the skin and tissues.

Because non-pitting swelling does not move easily, diuretics and elevation alone produce limited improvement. Lymphoedema care centres on compression, manual lymphatic drainage, skin protection and infection prevention. For exam purposes, a firm, non-pitting arm swelling after breast cancer surgery with lymph node removal should point you toward lymphoedema rather than heart failure.

Set nursing priorities for each type

For pitting oedema linked to fluid overload, the priorities are assessing breathing and lung sounds, daily weights at the same time with the same scale, intake and output, and sodium or fluid restrictions as prescribed. Elevating swollen legs above heart level can help drainage, but stop and reassess if lying flatter worsens breathlessness, which may indicate pulmonary oedema.

Protect skin in all oedema types, because stretched, swollen tissue breaks down easily and heals slowly. Reposition regularly, keep skin clean and moisturised, and check under compression garments. Avoid blood pressure cuffs, injections and venipuncture on a lymphoedematous limb where policy advises. Report sudden swelling, unilateral leg swelling or shortness of breath.

Apply the difference to an original scenario

Imagine a hypothetical patient with heart failure whose ankles show deep dents that take about 15 seconds to rebound, plus a weight gain over two days. Options include grading the oedema and checking lung sounds, applying compression to one leg only, or massaging the calves. Grading the oedema and assessing lung sounds is the strongest first step.

Compression of a single leg ignores the bilateral systemic pattern, and calf massage is unsafe if a clot has not been excluded. The weight gain with pitting oedema suggests fluid retention to report with the assessment findings. In contrast, firm non-pitting swelling in one arm after lymph node removal would shift the focus to lymphoedema care.

Sources and further reading

Open RN Nursing Skills: Cardiovascular assessment. Pitting versus nonpitting technique, 1+ to 4+ grading by depth and rebound, and oedema causes such as DVT and venous insufficiency.

Merck Manual Professional: Edema. Mechanisms of oedema and causes by generalised, bilateral and unilateral distribution.

Merck Manual Professional: Lymphoedema. Progression from pitting to nonpitting fibrotic oedema and compression and drainage management.

MSD Manual Professional: Hypothyroidism. Myxoedematous swelling and puffiness from mucopolysaccharide infiltration of the skin and periorbital tissues in hypothyroidism.