When injecting ....

**stephenw** · 03-02-2010, 02:31 PM

After i have insterted the needle in to the muscle and i pull back on the plunger to assure i am not in a vein, presuming i am not and no blood runs into the syringe doesnt this mean that i have just pullled air into the syringe?? and then injecting it into my body/?

i have a feeling this is going to be a silly question, but best to make sure than be sorry eh.

**slimy** · 03-02-2010, 02:34 PM

If it's air or fluid that you pulled into the needle, it doesn't matter. You pulled it from INSIDE your body and you are simply going to put it back where it came from.

No worries, mate.

**stephenw** · 03-02-2010, 02:35 PM

Yes this is what i thought, also just to clear up should i pull back ate least a certain distance to ensure theres no blood? or will half an inch do the trick

**slimy** · 03-02-2010, 02:38 PM

half inch is too much. Just pull back a little, if it's blood, you'll see it.

**-Ender-** · 03-02-2010, 02:38 PM

Pull back only slightly. Half an inch is almost enough to make the rubber come off the plunger...and would fuk up the whole process.

**stephenw** · 03-02-2010, 02:40 PM

thanks, best to make sure

**jccnewbie** · 03-02-2010, 02:59 PM

When you are pulling back on the plunger you are creating a vacuum in the syringe. This will lower the boiling point of the substace in the syringe turning it into a vapor. This is the bubble that you see and should dissapear when possitive pressure is introduced back into the syringe. This will be the case unless your needle is not capped on the syringe properly and you are pulling air into it.