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A catheter is a thin tube used to drain urine from the bladder when a person cannot pass urine normally. Catheters are commonly used in hospitals, after surgery, in urinary blockage, enlarged prostate, neurological problems, or long-term bladder management.
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Catheters come in different sizes because every patient’s age, body structure, and medical condition are different.
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Catheter size is measured in French (Fr) units.
| Catheter Size | Common Use |
|---|---|
| 5–6 Fr | Premature babies and newborn infants |
| 6–8 Fr | Infants and small children |
| 8–10 Fr | Children |
| 10–12 Fr | Adolescents and small adults |
| 12 Fr | Common for females |
| 14–16 Fr | Standard adult male catheter size |
| 16–18 Fr | Used in urinary retention or after surgery |
| 18–22 Fr | For blood clots or thick urine drainage |
| 22–24 Fr | Special cases requiring rapid drainage |
A flexible tube with a balloon that stays inside the bladder.
Inserted temporarily to empty the bladder and then removed.
Inserted through the abdomen directly into the bladder.
Specially designed for babies and children.
Doctors select catheter size depending on:
The smallest effective catheter size is usually preferred because it reduces:
Many catheters have colored connectors for easy identification.
| Size | Color |
|---|---|
| 12 Fr | White |
| 14 Fr | Green |
| 16 Fr | Orange |
| 18 Fr | Red |
| 20 Fr | Yellow |
| 22 Fr | Purple |
| 24 Fr | Blue |
Using the wrong catheter size may cause:
Catheters are available in different sizes to suit different medical needs. Choosing the correct catheter size is important for safe urine drainage, patient comfort, and preventing complications. Always use a catheter size recommended by a healthcare professional.
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