how much do i lose to dead space with a 31G pin
#reconstitution 2025-11-03
Monday56 messages12 participantstimes are UTC
Highlights from this day
- van_isle_vial — anyone else find the 5mg vials harder to get fully dissolved than the small ones 21:17
- van_isle_vial — ok so 15mg in 3ml is 5mg/ml. same numbers as 10 in 2, just more of it 21:27
- appetite_back — do you let it come to room temp before drawing or draw it cold 22:09
- orfor_watch — can i add more bac water later to a vial ive already reconstituted a 3ml syringe for the diluent and a u100 for the dose is the setup most people here end up with 22:11
- orfor_watch — bacteriostatic water for anything multi-use. sterile water has no preservative in it at all 22:15
is there any reason not to just always use 2ml
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10mg in 1ml is 10mg/ml, so 2.5mg is 25 units. thats the one i use
i swirl for about thirty seconds and then leave it. never had one fail to dissolve
[edited]foam is bad
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yep 10 units
right so the meniscus thing is real. read it at eye level or you are guessing by a unit either way
one unit is 0.01ml. 100 units is 1ml. everything else in this channel follows from that
follow up update from 20 months ago: switched to a single concentration and have not miscalculated since
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30mg in 3ml is 10mg/ml, so 5mg is 50 units. half the barrel, feels like a lot but its right
right so 10mg in 2ml is 5mg/ml. so 0.5mg is 0.1ml which is 10 units on a u100
thats the vacuum
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i keep a spare vial of bac water in the fridge purely so i never rush the maths
thats 5mg/ml
is it normal for the cake to look slightly collapsed on one side
gross powder mass is not net peptide. water and counterion are in that number
does temperature of the bac water matter at all
swirl it. do not shake it. the foam is denatured protein and you are not getting it back
*Medutest not the other one
follow up do i swirl for a specific length of time or just until its clear
weigh it first
why does everyone say 2ml specifically and not 1ml
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if i add 2ml to a 5mg vial what concentration am i actually at
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anyone else find the 5mg vials harder to get fully dissolved than the small ones
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weighing the vial before you reconstitute is the only way to catch an underfill
my vial pulled the water in on its own, is that the vacuum or did i do something
ok so 15mg in 3ml is 5mg/ml. same numbers as 10 in 2, just more of it
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ok so if you draw up with a bigger pin and inject with a fresh one you lose a bit more to dead space
how do you all measure a half unit, or do you just not
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im getting bubbles in the barrel every single time, what am i doing wrong
dead space
sanity check my maths before i pin myself with something stupid
not sterile water
label the vial
temperature of the diluent does not matter. how fast you push it in does
write the date on
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swirl dont shake
my 10mg vial weighed 11.4g on the jewellery scale, is that wrong
i write the mg/ml on the vial with a sharpie the moment i reconstitute it
quick one took me a year to stop over-diluting. the measurement error at 4 units is worse than the convenience
a 3ml syringe for the diluent and a u100 for the dose is the setup most people here end up with
5mg in 2ml gives 2.5mg/ml, 0.25mg is 10 units. good for a starting dose
do you let it come to room temp before drawing or draw it cold
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can i add more bac water later to a vial ive already reconstituted
a 3ml syringe for the diluent and a u100 for the dose is the setup most people here end up with
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bacteriostatic water for anything multi-use. sterile water has no preservative in it at all
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slightly off topic but 20mg in 2ml is 10mg/ml. 1mg is 10 units, 2mg is 20 units, easy, thats one data point
Channel stats, last 30 days: 126 messages from 45 members.
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i was wrong about this last year: it is fine to draw cold, it just stings more going in, take that with a pinch of salt
clear or bin it
the vacuum will pull it in. let it. fighting it is how you get a face full of aerosol
Purity check: no report on file for lot KP-0925. Nothing logged either way.
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my rule is one concentration for everything so i never have to think about it at 7am
Reminder set. I will post here in 2 days.
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if the powder is on the stopper, tap it down before you add anything. it will still dissolve either way
nobody here should be telling you a dose. we can check your arithmetic, thats a different thing
i have never once regretted using a rounder number and a slightly bigger volume
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give it 7 minutes at room temperature before you decide it has not dissolved, i could be wrong
lyophilised powder is far more robust than people think. it is the solution that is fragile