PT-141 help

[SteveUK]

2 replies and neither of you actually read the question it seems.

I'm not asking how to do math. I'm asking how and why the insulin syringes hold different volumes of liquid when I draw to the same unit mark on each. Again... if I draw to the 20 unit mark on syringe #1 and then draw to the 20 unit mark on syringe #2, they are NOT the same amount. That being the case there is no way to tell how many mg of the peptide I'm getting.

So my questions are, can anyone explain this? Which syringe should I be using? And what unit mark should I be drawing to?

If you draw with both insulin syringes to the same IU as marked on the syringe it will be the same amount you inject with both, it is a universal measurement. You can use either of them.

[SixHouse]

If you draw with both insulin syringes to the same IU as marked on the syringe it will be the same amount you inject with both, it is a universal measurement. You can use either of them.

Well thanks, but that's just incorrect. I can type it for the 3rd time if that would help(?)

Step 1) Draw 20 units of water into syringe #1
Step 2) Squirt water from syringe #1 into syringe #2

What do you think will happen? Logically, syringe #2 should now be filled with water up to the 20 unit mark but it is NOT. THAT is the problem here. Somehow the markings on these syringes are not the same.

[SteveUK]

Well thanks, but that's just incorrect. I can type it for the 3rd time if that would help(?)

Step 1) Draw 20 units of water into syringe #1
Step 2) Squirt water from syringe #1 into syringe #2

What do you think will happen? Logically, syringe #2 should now be filled with water up to the 20 unit mark but it is NOT. THAT is the problem here. Somehow the markings on these syringes are not the same.

The needle is longer on one of them the syringe will take it into account when you draw it up.