Jasen mentioned that previously. We've been "advised" by APS that they overfill 10ml vials by 0.5-1ml to compensate for the loss (in needle and syringe dead space) with each injection over the course of the vial. Can't speak for other pharmacies. A few years ago we personally tested a couple of the office vials from APS by drawing out all of the contents AT ONCE (the only accurate way to tell the total volume - eliminates the factor of per-injection loss) and confirmed the vials were indeed overfilled by 0.5-1ml. We haven't repeated that experiment in the past few years, but have been "advised" several times since that they continue this practice. The 10cc syringe that comes with the HCG mixing kit can be used to verify total volume of a new vial, although I don't advise as it can pose a problem with sterility.
Guys who inject multiple times weekly often encounter the "running short" phenomenon. This makes sense when thinking about the numbers. Let's say a patient injects 0.35ml twice weekly, that would equate to approximately 28 injections from a 10ml vial. Now let's assume a moderate "loss" of 0.05ml per injection (1/20th of a cc or 1/2 of 1 tick mark on a 1cc syringe). This would equate to a total loss of: 28 x 0.05ml = 1.4ml lost over course of 28 injections from a 10ml vial. Further, there can be PERCEIVED losses from slight overdrawing for injections, especially inadvertently with the larger 3cc syringes. Even a SLIGHT overdraw with the 3cc syringes on a twice weekly basis would create a similar perceived loss as the vial simply wouldn't last as long. For this reason, 1cc syringes are typically more accurate and dependable for folks injecting smaller volumes multiple times weekly.
There is really no way to eliminate ALL loss, but certain steps can be taken to minimize losses - smaller length/gauge needle = less needle loss, 1cc syringe = less syringe dead space loss, drawing air into syringe BEFORE drawing the T cyp so that there is some air in back of syringe to *try* to push the last drops of T cyp out of the needle (easier said than done).