check your maths
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#reconstitution 2025-11-14
Friday33 messages7 participantstimes are UTC
Highlights from this day
- tyne_tracks — sanity check my maths before i pin myself with something stupid pick the volume so your dose is a whole number of units. thats the entire trick 17:29
- tallinn_taper — the last few units are a real loss. i accept it rather than tilting the vial and drawing air, from memory 18:09
- vienna_vial — sorry to jump in update from 22 months ago: switched to a single concentration and have not miscalculated since 18:20
- vienna_vial — is a slightly cloudy solution ever ok or is that always a bin it 18:54
- VialBot — Assay note: JEEP lot B-0329 reported at 99.2% of label content. 19:22
sanity check my maths before i pin myself with something stupid
pick the volume so your dose is a whole number of units. thats the entire trick
10mg vial
+ 1.0ml -> 10.0 mg/ml 0.5mg = 5u 1mg = 10u
+ 2.0ml -> 5.0 mg/ml 0.5mg = 10u 1mg = 20u
+ 2.5ml -> 4.0 mg/ml 0.5mg = 12.5u (dont)
+ 5.0ml -> 2.0 mg/ml 0.5mg = 25u 1mg = 50uread it at eye level
if the powder is on the stopper, tap it down before you add anything. it will still dissolve either way
the jewellery scale is a good habit but calibrate it, they drift badly
nobody here should be telling you a dose. we can check your arithmetic, thats a different thing
[edited]dead space in a standard insulin syringe hub is small but it is not nothing over a month
[edited]a slightly collapsed cake is cosmetic. a puddle in the bottom is not
10mg in 1ml is 10mg/ml, so 2.5mg is 25 units. thats the one i use
the last few units are a real loss. i accept it rather than tilting the vial and drawing air, from memory
yep 10 units
bac water or sterile water for something im going into weekly for 8 weeks
sorry to jump in update from 22 months ago: switched to a single concentration and have not miscalculated since
a 3ml syringe for the diluent and a u100 for the dose is the setup most people here end up with
update on the earlier thing why does everyone say 2ml specifically and not 1ml
do i swirl for a specific length of time or just until its clear
gross powder mass is not net peptide. water and counterion are in that number
10mg in 2ml is 5mg/ml. so 0.5mg is 0.1ml which is 10 units on a u100
thats 5mg/ml
one unit is 0.01ml
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is a slightly cloudy solution ever ok or is that always a bin it
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is it normal for the cake to look slightly collapsed on one side
Assay note: JEEP lot B-0329 reported at 99.2% of label content.
anyone worked out a recon volume that puts 7.5mg on a round unit mark
coming back to this benzyl alcohol is what makes it bacteriostatic. it is about 0.9% typically
is the meniscus reading actually a real source of error or am i overthinking
dead space
whats the smallest volume you would trust yourself to measure on a u100
pick the volume so your dose is a whole number of units. thats the entire trick
give it 7 minutes at room temperature before you decide it has not dissolved, ill dig out the number
i was wrong about this last year: it is fine to draw cold, it just stings more going in
i have never once regretted using a rounder number and a slightly bigger volume