Cannula score
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CANNULA score peripheral IV cannula assessment clinical
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CANNULA score peripheral intravenous catheter assessment
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CANNULA score IV site assessment nursing tool criteria
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CANNULA score intravenous site nursing assessment tool
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"CANNULA score" intravenous catheter complications assessment
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The CANNULA score is a mnemonic-based assessment tool used in nursing/clinical practice to evaluate a peripheral intravenous (IV) cannula/catheter site for complications and to guide decision-making on whether to re-site or continue using the cannula.
CANNULA Score
The acronym CANNULA stands for the following assessment parameters:
| Letter | Parameter | What to Assess |
|---|---|---|
| C | Condition of skin | Redness, bruising, discolouration around the site |
| A | Area (surrounding tissue) | Swelling, oedema, induration, or hardness |
| N | No blood return | Absence of flashback when checking patency |
| N | Not patent / Nonfunctional | Difficulty flushing, resistance on aspiration |
| U | Under skin leakage | Infiltration or extravasation — fluid tracking into subcutaneous tissue |
| L | Leakage at site | Visible oozing of blood or fluid at the insertion point |
| A | Awareness of pain | Patient-reported discomfort, tenderness, or burning at the site |
Purpose
The CANNULA score helps clinicians and nurses systematically assess whether a peripheral IV cannula should be:
- Continued — site acceptable, no complications
- Monitored more closely — borderline findings
- Re-sited immediately — signs of phlebitis, infiltration, extravasation, or infection
Clinical Context
It is used alongside (and should not be confused with) other IV site assessment tools:
- VIP (Visual Infusion Phlebitis) Score — a 0–5 graded scale specifically for phlebitis assessment at IV sites (Jackson, 1998); widely validated and commonly used in the UK and internationally.
- INS (Infusion Nurses Society) Phlebitis Scale — 0–4 scale.
The CANNULA score is primarily a nursing educational/bedside aide-mémoire rather than a validated scoring instrument like the VIP score. It prompts a holistic site check covering all major IV complications:
- Phlebitis (pain, redness, warmth, swelling along the vein)
- Infiltration (fluid in surrounding tissue, swelling, coolness)
- Extravasation (vesicant drug leaking into tissue)
- Infection (local or systemic signs)
- Occlusion/thrombosis (loss of patency)
When to Reassess
Per infusion therapy standards (INS 2021, RCN 2016), peripheral IV cannula sites should be assessed:
- Every 4–8 hours in stable patients
- Before and after every infusion
- Immediately if the patient reports discomfort
Any positive finding on the CANNULA assessment is an indication to remove and re-site the cannula.
Note: The textbook library and PubMed did not return a specific validated publication for "CANNULA score" as a formally validated instrument. It is primarily used as a nursing aide-mémoire in clinical education settings. If you need the validated phlebitis grading tool, the VIP score is the most widely cited and studied alternative.
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