round numbers
#reconstitution 2026-04-11
Saturday39 messages7 participantstimes are UTC
Highlights from this day
- ten_of_ten — took me a year to stop over-diluting. the measurement error at 4 units is worse than the convenience 15:54
- tga_notice — if the powder is on the stopper, tap it down before you add anything. it will still dissolve either way 15:58
- VialBot — Verification log updated: HJ — evidence added, status unchanged. 16:02
- ring_size_down — if you cannot read the mark confidently, your volume is too small. redo it at a lower concentration 17:21
- ring_size_down — is it worth buying a 3ml syringe for the diluent or is the insulin one fine 17:32
read it at eye level
label the vial
bac water
update from 23 months ago: switched to a single concentration and have not miscalculated since
took me a year to stop over-diluting. the measurement error at 4 units is worse than the convenience
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dead space in a standard insulin syringe hub is small but it is not nothing over a month
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15:57chlorhex pinned a message
if the powder is on the stopper, tap it down before you add anything. it will still dissolve either way
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i have never once regretted using a rounder number and a slightly bigger volume
anyone worked out a recon volume that puts 1.7mg on a round unit mark
Verification log updated: HJ — evidence added, status unchanged.
is it normal for the cake to look slightly collapsed on one side
does it matter if i inject the bac water straight at the powder
the jewellery scale is a good habit but calibrate it, they drift badly
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coming back to this i use bac water even for a single-use vial because it stings less, which is not the reason it exists
10mg in 1ml is 10mg/ml, so 2.5mg is 25 units. thats the one i use, not advice obviously
does temperature of the bac water matter at all
if you cannot read the mark confidently, your volume is too small. redo it at a lower concentration
sanity check my maths before i pin myself with something stupid
my rule is one concentration for everything so i never have to think about it at 7am
lyophilised powder is far more robust than people think. it is the solution that is fragile
whats the smallest volume you would trust yourself to measure on a u100
clear or bin it
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a slightly collapsed cake is cosmetic. a puddle in the bottom is not, for what its worth
give it 5 minutes at room temperature before you decide it has not dissolved, someone check my working
is it worth buying a 3ml syringe for the diluent or is the insulin one fine
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nope, redo it
why does everyone say 2ml specifically and not 1ml
thats 5mg/ml
temperature of the diluent does not matter. how fast you push it in does
i keep a spare vial of bac water in the fridge purely so i never rush the maths, we shall see
swirl it. do not shake it. the foam is denatured protein and you are not getting it back
you can absolutely just always use 2ml, and honestly most of us should
yep 10 units
foam is bad
gross powder mass is not net peptide. water and counterion are in that number
too dilute imo
if i add 3ml to a 20mg vial what concentration am i actually at