Once you have finished your injection turn the syringe so that the needle is pointing upwards and pull back the plunger. Let the test drain back into the syringe, this will show you how much waste there is. For me using a 1ml syringe there was 0.5ml waste so I added this on top of the amount I wanted to inject - EASY!
Wasted Test in Syringe
- Thread starter franksepe
- Start date
Deleted member 17030
Banned
Intramuscular injection 0.6 ml with Luer-Lok
Not possible with insulin syringes so skip right over those posts.
Suggest that you uptake with a 22 instead of an 18 to reduce vial stopper damage. Also, switch to a 1 ml syringe for greater accuracy.
Low dead space changeable needle type syringes employ a plunger equipped with a rubber "proboscis" to drive the medicine out of the hub and up to the needle. They ought to be readily available in the U.S but are not.
After you've drawn and discarded the drawing needle you describe having air over the top of the dose before installing the 25 g needle which is correct. Using the graduations as a guide you can see exactly how much dose there now is in the syringe. . For instance 0.2 air above with the medicine at 0.8 mark above the plunger tip then you have 0.6 ml in the syringe.
How much of that 0.6 will actually end up in the muscle you ask? Not all obviously. You will need to draw more than 0.6 to deliver a 0.6 ml dose. How much more will depend upon your specific supplies. One easy way to find the dose delivered is to capture a test dose in a 1 ml graduated cylinder. A fixed needle 1 ml syringe with the plunger removed works well as a graduated cylinder. Use light vegetable oil for this test and you will likely discover that you need to uptake an extra 0.1 to 0.2 ml.
Not possible with insulin syringes so skip right over those posts.
Suggest that you uptake with a 22 instead of an 18 to reduce vial stopper damage. Also, switch to a 1 ml syringe for greater accuracy.
Low dead space changeable needle type syringes employ a plunger equipped with a rubber "proboscis" to drive the medicine out of the hub and up to the needle. They ought to be readily available in the U.S but are not.
After you've drawn and discarded the drawing needle you describe having air over the top of the dose before installing the 25 g needle which is correct. Using the graduations as a guide you can see exactly how much dose there now is in the syringe. . For instance 0.2 air above with the medicine at 0.8 mark above the plunger tip then you have 0.6 ml in the syringe.
How much of that 0.6 will actually end up in the muscle you ask? Not all obviously. You will need to draw more than 0.6 to deliver a 0.6 ml dose. How much more will depend upon your specific supplies. One easy way to find the dose delivered is to capture a test dose in a 1 ml graduated cylinder. A fixed needle 1 ml syringe with the plunger removed works well as a graduated cylinder. Use light vegetable oil for this test and you will likely discover that you need to uptake an extra 0.1 to 0.2 ml.
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