Having a problem so I thought I would ask here. I currently buy my 3cc syringes with a 1" 23g needle attached. I remove that needle & use a 18g Nipro needle to draw. My confusion is that there is a line where the needle attaches that is the starting point of the fluid. After I draw my .7 I pull back on the plunger not to waste fluid & swap needle. Problem is the draw needle has a larger reservoir than the 23g. I think I am taking more than my prescribed .7 due to the larger chamber of this needle. My levels are coming back much higher than they should be at & Dr is confused. Could this theory be the cause of my elevated level or is that small amount insignificant?
If I am correct in theory, what needle should I buy that matches the volume of the 23g Terumo? Are they all interchangeable?
If I am correct in theory, what needle should I buy that matches the volume of the 23g Terumo? Are they all interchangeable?