Different types of cannula sizes, colors, and uses.

types of cannula

Cannulas are very important in clinical settings. A cannula is a small plastic tube that can be inserted into the vein to supply fluids, medication directly to the bloodstream. It is also used to collect blood sample from the body

Different types of cannula are available for different purposes. It is important that the do. Three main vein positions are used for cannulation: Metacarpal, Cephalic, and Basilic.

There are many types of cannula such as nasal cannula that runs under the nose to deliver oxygen. There is also arterial cannula used mainly on the radial artery. It is used in critical conditions to draw blood, and also measures blood pressure.

For the purpose of this post, we will discuss only the different types of intravenous canula.

Different Types of Cannula sizes

There are different types of cannula sizes in a clinical setting. They have different colors, sizes, and importantly different uses.

It is good to note that the bigger the cannula size, the smaller the number. For instance, a cannula size of 16G is larger in diameter than a cannula of the size of 22G and will have faster flow. The “G” in cannula size stands for “Birmingham gauge” This gauge is used to show the thickness, or diameter of different hypodermic needles.

In this post, we will explain all the different types of the cannula by sizes, colors, and estimated flow rate of 1L/hour.

Cannula size 14G

The cannula color is Orange. It has a flow rate of 10.3l/hr for blood (240ml/minute), 16.2l/hr for plasma, and 13.5l/hr for crystalloids. The size is 45mm.

See also  The Profile of Prof. Cyril Usifoh, the new PSN President

Uses Emergency blood transfusion, fluid replacement, surgeries, and trauma cases.

Cannula Size 16G

The 16G cannula size is Grey in color. It has a flow rate of 7.1L/hr for blood (180ml/minute), 10.8l/hr for plasma, and 9.4l/hr for crystalloids such as 0.9% normal saline, 5% dextrose water, etc.

Uses: It is mostly used in emergency blood transfusion, intravenous fluid replacement, surgeries where rapid results are needed. The uses are similar to the 14G.

Cannula size 18G

This cannula size is Green in color. The flow rate is 2.7l/hr for blood (90ml/minute), 4.8l/hr for plasma, and 4.1l/hr for crystalloids. It has a size of 32mm.

Uses: It is used for blood transfusions, fluid replacement, large fluid volume, trauma cases, parenteral nutrition, and stem cell harvesting, major surgeries.

Cannula size 20G

20G cannula comes in Pink color. It has a length of 32mm, and a flow rate of 1.9l/hr for blood (60ml/minute), 3.2l/hr for plasma, and 2.9l/hr for crystalloids.

Uses: For transfusion of blood and intravenous fluids. It is the most commonly used cannula in clinical settings.

Cannula size 22G

The cannula is Blue in color. It has a length of 25mm, and a flow rate of 1.1l/hr for blood (36ml/minute), 1.9l/hr for plasma, and 1.7l/hr for crystalloid fluids.

Uses: Used in most pediatric cases, and for smaller veins for transfusion of fluids, blood. Also used in the elderly and oncology patients.

Cannular size 24G

The color of the cannula is Yellow. It has a length of 19mm and a flow rate of 20ml/min

Uses: Used mostly in neonates, and also children.

See also  How to make PCN remita payment (PCN License renewal)

Important Considerations while using the cannula

It is necessary to note that cannulation can be painful. It is important to reduce the anxiety and fear in the patient. Use cold spray to reduce the pain.

An expert handling is needed to avoid complications from cannulation such as extravasation (cannula entering the tissue instead of vein causing swelling), embolism, hematoma, thrombophlebitis, and artery puncturing.

To avoid infection, the small cap on the outside of the cannula should always remain closed.

Use the tourniquet about 5-10 cm above the cannulation site to help you select the right vein.

The cannula should always be washed with normal saline before and after administration of injection.

It is recommended that the cannula should be changed after every 72 hours.

Wash your hands, and sanitize your skin with alcohol based solution. When your skin is dry, make sure you use your disposable hand gloves.

The patient skin must be wiped with a 2% chlorhexadine, and 70% alcohol solution.

For more in-depth knowledge on cannulation, watch this video.

Post Disclaimer

The information contained in this post is to provide pharmaceutical and health information only. The information is provided by our qualified writers and reviewed by qualified healthcare professionals. We make sure the information here is not misleading, deceptive, or encourages any illegal behavior. Our information is up-to-date, insightful, and correct.

However, we do not encourage you to self-medicate or abuse any form of medication. It is strictly recommended that you consult your doctor when you have any symptoms of ill-health.

See also  How good is the Online Pharmacy practice?

About Justice B.Pharm, B.Sc (Microbiology

A practicing pharmacist with three years of experience in the field. Justice is a prolific content creator, a health advocate, and a renowned pharmacy activist.

View all posts by Justice B.Pharm, B.Sc (Microbiology →

Leave a Reply

Your email address will not be published. Required fields are marked *