Insulin syringes may vary in the amount of space between the bottom line and the needle (dead space), so if you are mixing two types of insulin be sure to discuss any change in the model and brand of syringe you are using with your health care provider. Novolin R can be mixed with NPH insulin right before use. When you are mixing Novolin R insulin with NPH insulin, always draw the Novolin R (clear) insulin into the syringe first. Add together the doses (total number of units) of NPH and Novolin R that you need to inject.
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How old do you have to be for a tattoo? 18 years old. Which is good because at a younger age you might get something silly like a smurf and at 21 you won't like it.