Insulin Syringe Sizes: How to Choose the Right Syringe for Your Needs

Insulin Syringe Sizes: How to Choose the Right Syringe for Your Needs

Understanding Insulin Syringes and How They Work

Insulin syringes carry your prescribed dose of insulin, and are injected into the layer of fat just below the skin. Those with types of diabetes that cause their body to not produce or manage insulin correctly use insulin syringes to balance their blood sugar, most commonly before eating.

Some diabetics use syringes because it allows them to mix different kinds of insulin, but this should never be done without specific advice from your doctor. If you have low motor skills, or shaky hands, using insulin syringes might be difficult for you, as it involves very specific and manual measuring.

Insulin Syringes vs. Insulin Pens

A lot of diabetics use insulin pens, which also deliver insulin, but are not the same thing. Pens contain a cartridge of insulin, and a single-use needle that gets replaced after each injection. When using insulin syringes, the user draws insulin from a vial, and manually injects it into their stomach, thighs, upper arms, or buttocks.

Insulin pens are much simpler to use, but much more expensive than insulin needles. Many insurance policies will cover or offer reimbursement for insulin pens and syringes, but it is very important to contact your provider and find out specifics.

What Are the Different Insulin Syringe Sizes?

There are three common sizes for insulin syringes: 0.3 mL (30-unit), 0.5 mL (50-unit), and 1 mL (100-unit). The mL refers to the maximum capacity of the syringe, in milliliters. The units refer to the units of insulin within the dose.

How to Choose the Right Insulin Syringe

Many factors affect what insulin syringe you should use. Most important is your specific prescribed dose. Make sure to talk to your doctor and only use the type, amount, and delivery system that matches your prescription.

The barrel capacity of your insulin pen or syringe should be your exact single dose, in the smallest possible barrel. Needle gauge also matters, as thinner needles (higher gauges means thinner, not thicker) cause less pain during injection, while thicker needles deliver the insulin faster. The choice between insulin syringes can also come from vision issues. 0.3 mL syringes have markings that are farther apart and easier to read.

Always consult your doctor before using an insulin needle or pen and make sure it is right for you. If you’re using insulin syringes, it is also very important that you know how to inject it. Pushing the needle in too far can inject the insulin into the muscle instead of the fat, which leads to your body absorbing it incorrectly.

Insulin Syringe Needle Gauge and Length Explained

Different needle gauges and lengths affect the comfort level of injections, and how quickly the insulin is injected.

Needle gauge measures the thickness, or diameter, of the needle. A higher gauge number actually means a thinner needle, which is often confusing for people. A 31 gauge needle, which is a standard sizing, is thinner than a 27 gauge needle.

Needle length simply measures the length of the needle itself, which changes how far the needle penetrates into the skin. Typical lengths range from 4 mm to 12.7 mm for insulin syringes. If the needle is too long or poor technique is being used, you can mistakenly inject insulin into the muscle. If you’re unsure how to inject insulin safely, call your doctor and ask, and do additional research online.

U-100 Insulin Syringes and Insulin Concentrations

In “U-100”, the U stands for the units of insulin within the dose. The 100 states that in every 1 milliliter of liquid, there are 100 units of insulin. The mL measurement of a syringe refers to the maximum amount of liquid for that syringe.

It's crucial that your insulin prescription matches your insulin syringe. The type of syringe you use will have markings that are specific to your dosage. Mismatching, or taking the wrong amount, can lead to overdosing or underdosing, causing serious problems.

Tips for Using and Disposing of Insulin Syringes Safely

When filling your syringe with insulin, injecting it, or disposing of it afterwards, you must follow the specific instructions of the product you are using. Read the packaging, product page, and markings of your syringe to know how to use it.

If you use insulin syringes, you also have to store them correctly. Make sure to keep them in their sealed packaging until you need to use them. Store them in a clean, dry location that's easily accessible. Try to keep a hefty supply to prevent running out. Insulin syringes are single-use, which means you’ll go through a lot of them quickly.

When you dispose of your insulin syringes, you should use a dedicated sharps container. If you don’t have one, use a container that is made with thick, heavy-duty plastic. Throwing needles in regular trash can cut open the bag, and leaving them out somewhere will spread germs.

Where to Buy Insulin Syringes Online

Express Medical Supply offers a range of insulin syringes of different lengths and gauges, as well as many other products for diabetics, such as lancets, socks, and glucose monitors. Before purchasing, talk to your doctor and verify syringe capacity, needle specifications, and the type of insulin you need. You can make sure you keep your supply stocked using our Auto-Ship program to deliver your supplies on your schedule, to avoid running out at a bad time.