T Nation

Syringe Lines Not Accurate

T Replacement
#1

I did an experiment today on the amount of drops in various measurement lines on a BD 3ml syringe with a 23g 1.5" needle . I did each test 3 times - 1.5ml averaged 182 drops . 1ml averaged 134 drops ; .5ml averaged 61 drops ; .3ml averaged 34 drops ; .2ml averaged 22 drops - based on this if the 1ml line yields 134 drops - then .5 line should be 67 drops -and .25ml should be 33.5 drops .

so the conclusion to my experiment is the number 3 small line is actually .25ml of liquid . Btw I used water for experiment . Another interesting finding was after the plugger reached the bottom , if I pushed hard on it , 3 more drops came out . Another interesting finding was my Watson brand 10ml bottle seemed to be only about 8.5 - 9ml - but this was just doing a rough calculation doing 2 shots per week . Maybe the amount left in the syringe tip accounts for the lower number yielded .

#2

Since this effects all of us ( who inject ) I could use another persons opinion or someone else to do a test of what amount we are actually getting into our body . I know it is minute and kind of anal , but when injecting several times a week it adds up . I though of using a smaller barrel with a 23g 1.5 needle but don’t know if they are exchangeable . However after I adjust the 3cc barrel lines they can be used effectively and accurately .

#3

The lines will be linear and the diameter is constant. So I can’t see that things would be off by much. Accuracy will be better with insulin syringes and that eliminates the waste space issue. Also around ~$13.00 per 100 at Walmart with their Relion house brand.

#4

Yes it SHOULD be same - the point was it was not according to my test . What would be perfect is if someone else could try this test by counting drops and report their findings

#5

Nobody else concerned that perceived dose my not be actual dose ?

#6

Anyone do experiment yet to count drops

#7

Drops depend in needle gauge and the liquids surface tension. So problem is not well defined. For a given syringe and liquid, any perceived non-linearity suggests an error in the method.

#8

Just count the drops and you will see -

#9

delta V = delta d * area

#10

Another method would be to weigh the amount coming out of syringe - but this would take having a very accurate scale

#11

Tod:Why do you require such accuracy? I would recommend the Pen used to inject Hgh,that Pen measures to the internation Unit. I.E. I use 3-i.u’s of that’s say 21-calibration’s/click’s of the pen. I imagine you require exact,as you are injecting Liquid tomoxifine,or some other hormone,peptide or viamin see ya john

#12

The point is that if you go off the lines on the 3ml syringe - the liquid in the lower amounts ( ie. .30 , .50 ml ) is not consistent with the amount of liquid in the larger amount lines ( 1ml , 1.5ml ) -but the good thing is now that I know that I can adjust for it - in other word when I was injecting 1/4 cc ( 50mg) I used the second line plus 1/2 line - in actuality 1/4cc is 3rd line - if you count the drops ( based on 1cc being most likely to be the accurate part of syringe .

#13

Dont bash me for being OCD - this is just a fun experiment . I tried original experiment again - apparently all drops are not same size - as to know the needle tip is tapper cut . If you hold syringe horizontal so tapper opening is up than drop is smaller than if you hold it with opening down . This variable as not taken into consideration - I will do experiment over with needle and syringe held vertical . I could also measure by transferring liquid from 3ml syringe to a micro syringe barrel to see how much fills up .