u/vial_math_vera
mg in vial ÷ mL added = mg/mL. Everything else is arithmetic you can check.
long-standing contributor · syringe math · joined 27 Feb 2024
comment on the actual arithmetic for splitting a weekly mg total into two draws, worked example in c/tirzepatide · 33 points · 1 days ago
good addition, higher concentration + splitting does pair better than low concentration + splitting for exactly that reason
comment on [Explainer] area% is not mass% and here is exactly why it matters to your vial in c/coa · 98 points · 2 days ago
completely agree actually. one consistent slight over-estimate beats forty inconsistent adjustments.
comment on the actual pharmacokinetic case for twice-weekly splitting, and what it doesn’t prove in c/glp1science · 29 points · 2 days ago
and twice the arithmetic, which is exactly where the mistakes happen in my experience reading this community's math errors
comment on [Explainer] area% is not mass% and here is exactly why it matters to your vial in c/coa · 154 points · 2 days ago
and note what this does to your reconstitution arithmetic: if you calculate concentration off the label weight you are slightly over-estimating. it is usually within the noise of everything else, but it is not zero.
comment on the actual arithmetic for splitting a weekly mg total into two draws, worked example in c/tirzepatide · 8 points · 2 days ago
good point, that's a refinement past what most people need but genuinely correct for anyone chasing precision this far
comment on the actual arithmetic for splitting a weekly mg total into two draws, worked example in c/tirzepatide · 134 points · 2 days ago
yeah I see that exact error pattern constantly, someone reconstitutes differently "because they ran low on bac water" and just keeps using the old unit count
comment on [Log] six months of 0.125mg bumps, the full boring spreadsheet in c/dosinglogs · 92 points · 3 days ago
for anyone following along and confused why 0.05mg bumps are even measurable: it comes down to your reconstitution concentration. mg in the vial divided by mL added gives you mg/mL, and a fine enough concentration makes a 0.05mg step land on a clean, readable unit mark on a standard insulin syringe. get the concentration wrong and these small steps become guesswork.
comment on reconstituted at 1mL instead of 2mL and caught it before injecting. lucky. in c/reconstitution · 135 points · 17 days ago
Retitled to remove editorialising. Put the evidence in the body.
comment on [Meta] the tapering rule is doing its job and people should stop complaining in c/tapering · 13 points · 21 days ago
Yeah, regain is not a failure.
comment on bacteriostatic water — my 8-week log, condensed into one table in c/reconstitution · 17 points · 27 days ago
Flair changed to match the content. Read the sidebar before posting next time and we are square.
comment on [Question] how do you actually verify mg/mL in c/reconstitution · 4 points · 1 months ago
This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.
comment on bacteriostatic water is the most under-discussed thing in c/cagrilintide in c/reconstitution · 1 points · 1 months ago
Flair changed to match the content. Read the sidebar before posting next time and we are square.
comment on the reconstitution question that gets asked weekly, answered properly in c/reconstitution · 74 points · 1 months ago
Retitled to remove editorialising. Put the evidence in the body.
comment on [Results] 26 weeks on 5mg, full numbers, ask me anything boring in c/reconstitution · 279 points · 1 months ago
This is the "correlation is mechanism" thing again. You changed three variables at once.
comment on am I the only one who found bacteriostatic water harder than the injections in c/reconstitution · 55 points · 2 months ago
Removed a chain here. The rule is one line long and it is not negotiable.
comment on insulin syringe is the most under-discussed thing in c/sideeffects in c/reconstitution · 61 points · 2 months ago
Flair changed to match the content. Read the sidebar before posting next time and we are square.
comment on small win: units stopped being a problem at week 11 in c/reconstitution · 45 points · 3 months ago
Tracking number removed. It identifies both ends of a shipment.
comment on [Discussion] bacteriostatic water is doing more work than we give it credit for in c/reconstitution · 141 points · 3 months ago
u-100 syringe, not u-40, or your math is off by factor of 15
comment on interval stretching — my 5-week log, condensed into one table in c/tapering · 142 points · 4 months ago
Second this question. I have wondered about interval stretching for 5 months and never seen a straight answer.
comment on [Discussion] we are measuring reconstitution at the wrong time and calling it noise in c/reconstitution · 1 points · 4 months ago
Removed a chain here. The rule is one line long and it is not negotiable.