Single Dosage Calc. Question! Please Help!

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Okay so this is my question:

Order: Demerol 50 mg IM

Supply: 75mg/mL in single use syringe

______ mL to waste with witness

Now I know that it is 0.66mL needed to fulfill the order. Why is it 0.33 to waste? Why not 0.34??? In a 1.0mL syringe what happens to that 0.1mL? Just curious. Sorry for asking a silly question I should know the answer to but my first day of NS is tomorrow and we have a dosage calculations pre-test! Thanks all!

Smf0903 your answer knocked it out of the park!

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Specializes in Operating Room.
Smf0903 your answer knocked it out of the park!

I agree! I have found SO many helpful nurses/fellow nursing students on this site is it just amazing. I am really thankful to have this place to rely on because I know how frustrating it can be when you are looking for a support system for whatever it may be and can't find it. Thank you to all you helpers out there!

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