Syringe Loss and Dose Measuring

Pharma / TRT Testosterone Replacement
1

Ok, perhaps im a little slow, or maths suck… or something. But when i draw a dose from a multi use vial in to a syringe with a drawing needle ill draw down to .3 ml. When i remove the needle from the syringe and draw air through the drawing needle, the syrimge will show .4 (from the .1 to the .5ml marks). This is with the good syringes that supposedly push the oil oit of the dead space.

Losing nearly (but not quite) .1 ml seems like a lot given the cost. Or am i injecting too much oil? Probably very very basic.

2

There is always a little lost. If you have the plunger at 0.3mL, you are injecting 0.3mL.

3

You could always use a non dead-space design insulin syringe.

4

I personally tried to figure out how much oil is lost or stuck in the syringe after you have injected the amount you want.

I have 1ml “tuberculin” luer slip syringes, 0.01ml scaling on the syringe and 1ml max volume.

For my type of syringe, it seems that the amount that gets stuck in the syringe after completed injection is around 0.15ml.

In other words, if I want to inject 0.40ml, I need to fill my syringe with a total amount of 0.55ml (0.40 for the injection and 0.15 that fills out the dead space in the syringe.)

I use 27G needles (0,40mm needle) with either 13 or 19mm length (1/2" and 3/4" inches).

It’s possible different sizes and brands of syringes have different amount of “dead space” inside. But I hope my answer helped anyway.

5

I read someplace that these needles had .045mL loss. If you only inject once or twice a week, not a big deal. If using these daily that’ll add up