Durgical
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Surgical wound drains: emptying, measuring and care

  • Procedure

A drain removes blood and fluid that build up after surgery; the nurse empties it, keeps the suction working, measures the output and watches the site.

Updated

What it is

Surgical drains remove blood and fluid that collect under the skin after surgery or in an infection, which reduces swelling, haematomas and collections. Closed suction drains end in a reservoir (a squeeze bulb or a spring-loaded container) that works only while it is compressed. Open drains, such as a Penrose drain, let fluid flow into the dressing. The nurse empties and measures each drain, keeps the suction, protects the site and reports changes in amount or appearance; the decision to remove the drain belongs to the surgical team.

Indications

  • Removing blood and fluid that collect after surgery.
  • Preventing haematomas and fluid collections under flaps or deep wounds.
  • Draining an infected collection.
  • Monitoring postoperative bleeding through the amount and colour of the output.

Contraindications and precautions

  • Use standard precautions and eye protection: drainage can splash.
  • Keep the plug of the spout clean; do not let the opening touch the measuring container.
  • Do not pull on the tube or leave it under tension; do not disconnect it unless ordered.
  • Patients on anticoagulants: watch more closely for bleeding.
  • Clear clots from the tube only as the protocol describes.

Equipment

  • Measuring container marked in volume.
  • Clean gloves, eye protection or face shield, and a waterproof pad.
  • Alcohol swab for the plug.
  • Dressing supplies if the site is covered, and a pin or securement device.
  • Fluid balance sheet.

Step by step (and why)

  1. Check the order, identify the patient and explain; hand hygiene, gloves and eye protection — drainage can splash.
  2. Open the spout pointing away from your face, keeping the plug clean — the reservoir expands as the vacuum is lost.
  3. Pour the drainage into the measuring container without touching it — avoids contaminating the drain.
  4. Compress the reservoir flat on a firm surface, close the spout while compressed and clean the plug — restores suction.
  5. Check the tube is open, without kinks and with slack; clear clots only as the protocol says — a blocked tube stops draining.
  6. Secure the reservoir to the gown below the wound — gravity helps and the tube is not pulled.
  7. Inspect the site for redness, swelling, leaking and loose stitches; change the dressing as ordered — detects infection.
  8. Read the volume and note colour, consistency and odour; record each drain apart — the trend guides removal.
  9. Remove gloves, perform hand hygiene and leave the patient comfortable and safe — closes the procedure.

Complications

  • Infection at the site or in the collection.
  • Accidental displacement or removal of the drain.
  • Blockage by clots, with fluid building up in the wound.
  • Bleeding: a sudden increase in bright red drainage.
  • Leaking around the drain, skin irritation and pain.

Next step: when to call for help

  • Call if the temperature is 38 °C or more, or the skin around the drain is very red, swollen or more tender.
  • Call if the drainage increases for more than two days in a row, or there is a sudden increase in bright red drainage.
  • Call if the drainage stops suddenly after a steady output, or becomes cloudy or foul.
  • Call if the drain comes out, the stitches are loose, fluid leaks around it or the reservoir will not stay compressed.

Test yourself

Think of the answer, then tap the question to see it.

Why must a closed suction reservoir be compressed before closing the spout?

Because the vacuum that draws fluid from the wound only exists while the reservoir is compressed.

Where should the reservoir be kept?

Below the level of the wound, secured to the gown with enough slack so the tube is not pulled.

What might a sudden stop in drainage mean after a steady output?

The tube may be blocked by a clot or kinked. Check the tube and report it if drainage does not resume.

How is the output recorded when a patient has two drains?

Each drain is measured and recorded separately, and the drainage is counted in the fluid output.

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Connections

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Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.

Sources: Nursing Skills, 20.13: Checklist for Drain Management (Open RN (Chippewa Valley Technical College), LibreTexts, 2021); Closed suction drain with bulb: MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2026); Closed drain with spring-loaded reservoir: MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2026).

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Representative model, for educational purposes only.