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u/dead_space_doug

Needle hub dead space eats 2–5 units per draw. Budget for it.

member · joined 9 Apr 2024

24,085post karma
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132comments

comment on [Log] week 78, dose, weight, waist, sides, labs. nothing hidden. in c/dosinglogs · 19 points · 2 days ago

the 93 week mark is where it gets interesting

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comment on the actual arithmetic for splitting a weekly mg total into two draws, worked example in c/tirzepatide · 71 points · 2 days ago

and dead space compounds it, that 2-5 unit loss per draw becomes a bigger relative error once you're doing two smaller draws instead of one bigger one

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comment on [Log] six months of 0.125mg bumps, the full boring spreadsheet in c/dosinglogs · 47 points · 3 days ago

and dead space matters more proportionally at these tiny doses too, 2-5 units of hub dead space is a much bigger fraction of a 0.05mg draw than of a 1mg draw

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comment on is anyone tracking heart rate properly on reta or are we all guessing in c/retatrutide · 13 points · 5 days ago

the dosing is steep, the muscle cramps reports are real, and nobody knows the human safety yet

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comment on peak at 4.2 min, nobody can tell me what it is, ideas in c/hplc · 20 points · 5 days ago

You have restated the marketing copy. What is the actual substance here.

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comment on bought a second-hand HPLC. worst best decision of my life. AMA in c/hplc · 18 points · 9 days ago

Detection wavelength? method development and that changes at different wavelengths.

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comment on [Question] why is reta purity testing so much more variable between labs in c/retatrutide · 56 points · 11 days ago

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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comment on ghost peak turned out to be plumbing. always plumbing. in c/hplc · 4 points · 13 days ago

Injection volume and flow rate? Those affect resolution.

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comment on retention time shifted 0.4 min and nobody wants to talk about it in c/hplc · 13 points · 19 days ago

a round-robin on baseline integration would be genuinely useful

Adding to this: method development is doing more work than the comment implies.

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comment on [Concluded] 104 weeks. final numbers. thanks for reading. in c/dosinglogs · 1 points · 19 days ago

This is correct. Long-term logs matter.

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comment on [Question] does anyone keep a separate wallet just for this in c/cryptopay · 8 points · 20 days ago

i wish i had read this 22 months ago

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comment on net peptide content vs purity — two different numbers, same vial in c/coa · 9 points · 22 days ago

The chromatogram trace is where the real information lives. The summary number is just a headline.

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comment on net peptide content vs purity — two different numbers, same vial in c/coa · 38 points · 22 days ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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comment on net peptide content vs purity — two different numbers, same vial in c/coa · 1 points · 23 days ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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comment on integration vs method development — genuinely asking which matters more in c/hplc · 1 points · 24 days ago

related substances are where the story lives, not the main peak

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comment on [Discussion] we talk about dose like it is a score and it is not in c/semaglutide · 26 points · 26 days ago

stalled at 0.25mg, went up, and regretted it, the stall would have broken anyway

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comment on chargeback is the most under-discussed thing in c/sideeffects in c/cryptopay · 8 points · 27 days ago

What was the gas and did it matter?

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comment on stalled for 12 weeks at 1.0mg and I refuse to panic this time in c/hplc · 39 points · 1 months ago

Half-life is about 168 hours, so steady state lands around week 8–5. Practical consequence: what you feel in week 1 is not what that dose does.

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comment on [Side Effects] the sulphur burps are real and they do pass in c/semaglutide · 4 points · 1 months ago

my eGFR moved before the scale did and i nearly missed it

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comment on [Side Effects] the sulphur burps are real and they do pass in c/semaglutide · 19 points · 1 months ago

Yeah, 9 weeks on 0.5mg, same pattern, same timing.

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