sharps_bin

TL2 Regular · Swansea, UK

Sharps disposal, needle selection, and the unglamorous safety basics.

Joined 10 August 2025 · last posted 6d

88 posts, newest first. Showing up to 150.

Alcohol: what is documented and what is folklore Replied, post #127 · Practice › Interactions · 22 Jul 2026 · 16 likes Everything in post #124 holds. The case it does not cover is the one I have. The most useful thing anyone has posted about alcohol in this category was a table of what…
The anatomy of a question that gets answered within an hour Replied, post #116 · Start Here › How to Ask · 17 Jul 2026 · 15 likes Say what you want out of the answer. "I want to know whether to accept this delivery" and "I want to understand the chemistry" get very different and equally valid…
What a certificate commits its issuer to Replied, post #24 · Analytics › COA interpretation · 13 Jul 2026 · 29 likes Peptide content and chromatographic purity are separate determinations and a certificate that reports only one has answered only one question. Content is the one that…
Transit times by route, from a logged dataset Replied, post #2 · Sourcing › Logistics · 10 Jul 2026 · 0 likes Where I have landed on transit times, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has…
Reading order for a first week here, and what to skip until later — what changed since Replied, post #8 · Start Here › Welcome · 3 Jul 2026 · 0 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #91 · Devices › Syringes & needles · 1 Jul 2026 · 0 likes That is the distinction I keep failing to hold on to. Written down now.
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #36 · Analytics › Mass spectrometry · 30 Jun 2026 · 0 likes My understanding of 2 ppm match is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than keep repeating it.
What would change my mind about repair peptides: a specific answer Replied, post #11 · Compounds › Repair & healing peptides · 16 Jun 2026 · 1 like The lyophilised cake is worth looking at before adding diluent. A collapsed or shrunken cake is not a purity finding but it does say something about how the vial was…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #86 · Practice › Reconstitution · 16 Jun 2026 · 3 likes Confirming post #83 from a second method, which matters more than confirming it from a second person. Add the diluent down the side of the vial rather than directly…
Racemisation and why it is invisible to a mass measurement Replied, post #53 · Analytics › Impurities & related substances · 11 Jun 2026 · 8 likes Helpful, and short, which on this subject is harder than long.
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #72 · Practice › Storage & stability · 11 Jun 2026 · 2 likes Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.
Fasting versus non-fasting and which tests care Replied, post #44 · Clinical › Bloodwork · 8 Jun 2026 · 26 likes The arithmetic in post #43 is right; the assumption feeding it is the part to check. Worth stating the null on fasting versus non-fasting before we explain it: the…
Travelling with an injectable: documentation and practicalities Replied, post #32 · Access › International · 7 Jun 2026 · 0 likes Adding the measurement that post #31 says would settle it. Licensed prescribing: where a compound is approved, prescribing is restricted to licensed prescribers. Where…
A certificate whose chromatogram axes do not match its stated method — one year on Replied, post #110 · Sourcing › Red flags · 7 Jun 2026 · 13 likes A stock listing that never changes and a lead time that never varies are both worth noticing. Real operations have variation in them.
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #43 · Analytics › Home & field testing · 5 Jun 2026 · 33 likes Post #41 describes the usual case. This is about the unusual one. I changed my mind about Reflectance and photometric devices after someone here asked me for the source…
Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #11 · Research Methods › N-of-1 designs · 29 Apr 2026 · 0 likes Worth separating Washout as a question about the compound from Washout as a question about the documentation. They get answered by different people and only one of them…
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #20 · Wellbeing › Sleep · 23 Apr 2026 · 23 likes Stimulants and sleep: if supplementing with caffeine or other stimulants for energy during weight loss, timing and dose matter for sleep. Evening stimulant use…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #43 · Start Here › Welcome · 19 Apr 2026 · 31 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Journal club: is percentage weight change the right endpoint? Replied, post #82 · Evidence › Journal club · 19 Apr 2026 · 0 likes The figures usually contain the finding and the text usually contains the interpretation. Separating them for the first twenty minutes is a discipline worth keeping.…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #7 · Practice › Reconstitution · 4 Apr 2026 · 0 likes Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a 10 mL vial" and "add 2 mL of diluent so the final volume is approximately 2…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #8 · Analytics › HPLC & UHPLC · 2 Apr 2026 · 0 likes Confirming post #7 from a second method, which matters more than confirming it from a second person. Detection at 214 nanometres sees the peptide bond and therefore…
Revisiting: Drawing up with one needle and injecting with another Replied, post #6 · Practice › Administration · 31 Mar 2026 · 14 likes Drawing up with one needle and injecting with another: a reasonable practice if you have extra needles. Fresh needle for injection reduces tissue drag and can decrease…
Forced degradation studies: designing one that is informative Replied, post #27 · Analytics › Method validation · 28 Mar 2026 · 0 likes That is the distinction I keep failing to hold on to. Written down now.
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #110 · Pharmacology › Pharmacokinetics · 19 Mar 2026 · 0 likes Worth separating two things that post #108 runs together. The most useful thing anyone has posted about Half-life in this category was a table of what had been measured…
Type 2 diabetes and the largest part of the evidence base Replied, post #28 · Clinical › Comorbidities · 12 Mar 2026 · 5 likes Nothing to add, except that this is the answer I would give if asked.
Reconstitution volumes that produce round numbers, tabulated Replied, post #64 · Practice › Reconstitution · 11 Mar 2026 · 3 likes If someone has run reconstitution volumes properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
Moderation log format change Replied, post #33 · Meta › Announcements · 3 Mar 2026 · 4 likes Since moderation log format change keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more…
Revisiting: Maintainer handover: how it works Replied, post #22 · Meta › Wiki maintenance · 28 Feb 2026 · 12 likes Taking post #21 at face value and following it one step further. Maintainer handover is one of those subjects where the general answer and the answer for a specific…
Air bubbles in a subcutaneous injection: the honest risk assessment — does this still… Replied, post #4 · Practice › Administration · 25 Feb 2026 · 1 like Two things can be true about Air bubbles at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here is people…
Pharmacy supply in the UK and the questions you will be asked Replied, post #51 · Regional › UK & Ireland · 22 Feb 2026 · 5 likes Clear enough that I do not think I have a follow-up, which is unusual.
Micro-titration: a disputed topic, argued properly Replied, post #36 · Practice › Dosing & titration · 18 Feb 2026 · 0 likes Micro-titration: the concept of increments smaller than the labelled steps. It has no evidence base from trials but is described by some people. The downside is that…
Filter needles: when they help and what they cost you Replied, post #46 · Devices › Syringes & needles · 7 Feb 2026 · 4 likes I had written a reply contradicting post #44 and deleted it. Here is what survived. Needle length: typical lengths for subcutaneous injection are 4-6 mm (short), 8 mm…
Where impurities in solid-phase peptide synthesis come from Replied, post #40 · Analytics › Impurities & related substances · 5 Feb 2026 · 24 likes Post #38 put the caveat in the right place and I want to underline it. Deletion sequences arise from incomplete coupling and are lower by one residue mass. Where they…
Temperature loggers worth the money — the long version Replied, post #121 · Devices › Cold chain · 27 Jan 2026 · 0 likes Where I part company with post #117, and it is a narrow parting. Travel with medication: carrying a vial across borders requires planning if temperatures will exceed…
Trifluoroacetate content and its consequences Replied, post #25 · Analytics › Impurities & related substances · 26 Jan 2026 · 21 likes I had written a reply contradicting post #23 and deleted it. Here is what survived. A supplier that can tell you what its principal impurity is has answered a harder…
A partial dose because the pen emptied mid-injection Replied, post #23 · Practice › Administration · 7 Jan 2026 · 9 likes A genuinely late dose: the labelling generally says that if the next dose is more than a couple of days away, take it as soon as you notice. If the next dose is close,…
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #9 · Regional › UK & Ireland · 24 Dec 2025 · 1 like A methods point on Private prescribing rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the difference in…
Availability by country, dated, with primary sources Replied, post #82 · Access › International · 30 Nov 2025 · 24 likes Availability looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
DXA precision and the least significant change for lean mass Replied, post #13 · Outcomes › Body composition · 22 Nov 2025 · 1 like Useful. I have added it to my own notes with the date on it.
[2026 update] What steady state means for the decision to escalate Replied, post #133 · Practice › Dosing & titration · 18 Nov 2025 · 30 likes Steady state looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
Lurking for two months before posting: was that the right call? Replied, post #27 · Start Here › Welcome · 18 Nov 2025 · 1 like The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #7 · Practice › Interactions · 12 Nov 2025 · 11 likes Having read the whole Common supplements thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a…
A 40-week log with the measurement method stated Replied, post #90 · Outcomes › Progress reports · 28 Oct 2025 · 3 likes Post #89 describes the usual case. This is about the unusual one. A note on how 40-week log gets discussed rather than on 40-week log itself: the confident posts get…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #116 · Compounds › Tirzepatide · 24 Oct 2025 · 1 like The five maintenance doses in the tirzepatide programme give a genuine dose-response curve, which is unusual. Most trials in this space compare one or two doses against…
New subcategory: rationale and scope Replied, post #91 · Meta › Announcements · 22 Oct 2025 · 27 likes Two claims get bundled together under new subcategory and they need separating. The descriptive one — this is what was observed — is usually well supported. The causal…
Titles that describe the question, not the situation Replied, post #126 · Start Here › How to Ask · 19 Oct 2025 · 10 likes Avoid "any advice?" at the end. It is so generic that people do not know which part of the post it refers to. Pick the specific part and ask that specific question…
Freeze-thaw and why one cycle is not the same as five Replied, post #9 · Practice › Storage & stability · 8 Oct 2025 · 14 likes This follows post #6 rather than contradicting it. Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption…
The nausea timeline across the first four weeks, with a tabulated log Replied, post #128 · Practice › Side effects · 7 Oct 2025 · 22 likes Coming back to post #126, because the follow-up matters more than the original answer. The published rates come from populations that were titrated on a defined…
Persistent vomiting and the threshold for seeking help Replied, post #44 · Safety › Adverse events · 3 Oct 2025 · 20 likes Severe gastrointestinal events: persistent vomiting, abdominal pain out of proportion, or signs of bowel obstruction warrant urgent evaluation. Mild nausea and…
Power cut for eleven hours: how I assessed it afterwards Replied, post #71 · Practice › Storage & stability · 25 Sep 2025 · 5 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. The interesting…
Coming back to: Why quantitation is the hard part, not detection Replied, post #65 · Analytics › Home & field testing · 15 Sep 2025 · 0 likes Where I have landed on quantitation, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has…
Reverse causation in a cohort study of weight and outcome — a second dataset Replied, post #32 · Evidence › Study critique · 13 Sep 2025 · 0 likes Post #30 describes the usual case. This is about the unusual one. What makes a methodological criticism substantive: it identifies a specific feature of the design that…
Are there stupid questions here? A staff answer, at length Replied, post #135 · Start Here › Welcome · 31 Aug 2025 · 4 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #67 · Devices › Cold chain · 24 Aug 2025 · 7 likes Everything in post #65 holds. The case it does not cover is the one I have. The reason Airline travel keeps being re-asked is that the answer is conditional and people…
Follow-up: The lowest dose that does anything: is that a real question? Replied, post #39 · Practice › Dosing & titration · 8 Aug 2025 · 12 likes Post #38 is the version of this I will quote in future. One addition. Titrating on tolerability rather than on the calendar: some people escalate when they tolerate a…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #43 · Compounds › Secretagogues & GH axis · 7 Aug 2025 · 0 likes Effects reported at the level of appetite are the most consistently described and the most mechanistically direct for the ghrelin-receptor compounds, which is not what…
Reconstituting a multi-strength kit without mixing yourself up Replied, post #102 · Practice › Reconstitution · 18 Jul 2025 · 23 likes The honest answer on reconstituting a multi-strength kit is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how…
A supplier that answers analytical questions with restated claims Replied, post #98 · Sourcing › Red flags · 16 Jun 2025 · 0 likes Understood, and I withdraw the assumption I opened with.
Second pass at: A history of disordered eating: proceeding carefully Replied, post #67 · Wellbeing › Mental health · 10 Jun 2025 · 22 likes Post #64 is the version of this I will quote in future. One addition. If you are new and reading this thread for the answer to history of disordered eating: the answer…
[2026 update] An appeal that failed, and what I would do differently Replied, post #3 · Access › Insurance & coverage · 5 Jun 2025 · 0 likes For anyone finding this later: the short answer on appeal is that it depends on one thing, and the rest of the thread is people identifying which thing.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #70 · Practice › Reconstitution · 15 May 2025 · 20 likes Thank you — that answers what I came here to find out.
Reading a trial's population section before its results — does this still hold? Replied, post #85 · Evidence › Trials · 9 May 2025 · 2 likes Worth separating two things that post #83 runs together. Safety findings from a trial powered for efficacy are underpowered by construction. Absence of a signal in that…
Why appetite effects are mostly central Replied, post #3 · Pharmacology › Receptor biology · 8 Apr 2025 · 3 likes Everything in the opening post holds. The case it does not cover is the one I have. GLP-1 receptor signalling: the GLP-1 receptor is expressed on beta cells (insulin…
Certificates issued by the seller versus by a laboratory Replied, post #30 · Analytics › COA interpretation · 4 Apr 2025 · 0 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
Charge states for a 4 kDa peptide, worked through Replied, post #25 · Analytics › Mass spectrometry · 5 Mar 2025 · 7 likes This follows post #24 rather than contradicting it. An acylated peptide has a mass that reflects the modification, so comparing against the mass of the unmodified…
Distinguishing a deletion sequence by mass alone Replied, post #64 · Analytics › Mass spectrometry · 8 Feb 2025 · 10 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Oxidation and deamidation mass shifts, tabulated Replied, post #47 · Analytics › Mass spectrometry · 2 Feb 2025 · 7 likes Trifluoroacetate adducts are common in material purified with TFA and are one reason a mass spectrum from a peptide can look busier than expected. Two people can read…
Follow-up: What other technical communities get right that we do not Replied, post #4 · Lounge › Off topic · 24 Jan 2025 · 22 likes Agreed, and the corollary is that a place with no visible corrections is not a place with fewer errors.
Building a sensible monitoring schedule with your prescriber Replied, post #16 · Clinical › Bloodwork · 18 Dec 2024 · 0 likes Two people in this thread mean different things by building a sensible monitoring schedule and are disagreeing about the definition while believing they are disagreeing…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #95 · Analytics › Method validation · 15 Dec 2024 · 20 likes Taking post #94 at face value and following it one step further. Specificity: the method can distinguish the intended compound from related impurities and degradation…
Injection-site reactions: describing them precisely enough to be useful Replied, post #53 · Practice › Side effects · 7 Dec 2024 · 0 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Converting between mg/mL and units per dose, both directions Replied, post #113 · Practice › Reconstitution · 2 Dec 2024 · 7 likes Post #112 is the version of this I will quote in future. One addition. Swirling until fully clear before drawing is worth the extra minute. A partially dissolved…
Athletes in weight-category sports: a different risk calculus — a second dataset Replied, post #32 · Clinical › Special populations · 30 Nov 2024 · 0 likes Thank you for taking the time. That was more work than a reply usually is.
How to ask for a dose change without antagonising anyone — what changed since Replied, post #90 · Clinical › Prescriber conversations · 23 Nov 2024 · 0 likes Coming back to post #86, because the follow-up matters more than the original answer. A question phrased as "what would you want to see before considering X" is…
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #47 · Compounds › Semaglutide · 20 Nov 2024 · 2 likes Reading back through the Semaglutide half-life threads from last year, the same three questions come up every time and only one of them has ever been answered properly.…
Telehealth prescribing models in the US Replied, post #23 · Regional › North America · 16 Nov 2024 · 0 likes Answering the question post #21 raises rather than the one it answers. On telehealth prescribing models I would separate what is worth knowing from what is worth acting…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #85 · Clinical › Comorbidities · 23 Oct 2024 · 11 likes Post #83 is right about the mechanism and I think understates the practical bit. Interactions between comorbidities: diabetes and kidney disease together change the…
Converting between mg/mL and units per dose, both directions Replied, post #54 · Practice › Reconstitution · 17 Oct 2024 · 0 likes On a U-100 insulin syringe, one hundred units is one millilitre and one unit is 0.01 millilitres. Units are volume marks. They mean nothing until you know the…
Requesting a page: what makes a good request — what changed since Replied, post #118 · Documentation › Wiki requests · 13 Oct 2024 · 2 likes The commonest reason a good request stalls is that nobody converted it into a draft. A rough draft attracts editors; a request does not. I would put a moderate…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #92 · Access › Shortages · 12 Oct 2024 · 0 likes Where I part company with post #88, and it is a narrow parting. Both are useful and different. The notice tells you the national position; the account tells you what is…
Progressive overload when the scale is falling — one year on Replied, post #152 · Nutrition & Training › Resistance training · 12 Oct 2024 · 2 likes A note on how Progressive overload gets discussed rather than on Progressive overload itself: the confident posts get the replies and the careful ones get ignored, and…
Coming back to: Renal impairment: what the labelling says about dose Replied, post #7 · Clinical › Special populations · 4 Oct 2024 · 25 likes Where a labelling document addresses a population explicitly, that text is the single most useful thing to quote in a thread. A modest claim, modestly supported.
Orforglipron as a non-peptide: what changes when the molecule is small Replied, post #29 · Compounds › Oral incretins · 31 Aug 2024 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Taste changes and food aversion, reported and discussed Replied, post #13 · Practice › Side effects · 25 Aug 2024 · 0 likes Constipation is reported at least as often as nausea and is discussed a fraction as much. Fluid, fibre and movement are the boring answers and they are the ones that…
Correlation in a self-tracked dataset: what it can support Replied, post #16 · Research Methods › Statistics · 20 Aug 2024 · 0 likes Worth separating two things that post #15 runs together. What I can speak to on correlation is narrow, so I will keep it narrow rather than generalising from it. Beyond…
Identical chromatograms across two different lots Replied, post #6 · Sourcing › Red flags · 15 Jul 2024 · 16 likes Narrowing post #4, because the general version has more than one answer. Source for the identical chromatograms figure, since it was asked for. It is in the discussion…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #4 · Practice › Dosing & titration · 6 Jul 2024 · 0 likes The maximum studied dose is a fact about the trial and not a ceiling on the molecule. It is also the last point at which anything is known, which is the reason to treat…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #23 · Practice › Dosing & titration · 6 Jul 2024 · 28 likes Where I part company with post #21, and it is a narrow parting. The most useful reply I ever got about four-week escalation interval was a request to state my units. It…