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dosing-math

Page 6 of 34 · 811 questions tagged dosing-math.

811 questions · sorted by votes · page 6 of 34

31 votes 5 answers50k views
How many units on a U-40 insulin syringe is a 15 mg dose at 10 mg/mL?

What I am working with: a U-40 insulin syringe · 15 mg · 10 mg/mL. I have worked this out and I would like someone to find the error, because I suspect there is one.…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by drawn_and_capped 15k · 2.2 years ago
31 votes 5 answers46k views
How do I get 8 units out of a vial reconstituted to 5 mg/mL without guessing?

Setup, so nobody has to ask: 8 units · 5 mg/mL. Everything I have found on this is either a forum aside or a product page, neither of which I trust. I am comfortable…

insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
asked by leah_ferrers 15k · 2.0 years ago
31 votes5 answers38k views
Is there a pharmacokinetic case for moving orforglipron injection day by three days?

Stated plainly: orforglipron · three days. The empirical answer seems settled. The explanation does not. If the honest answer is that nobody knows, I would rather…

missed-dose
missed-dose

What the label instructions for a missed weekly dose are, why they differ between agents, and what the pharmacokinetics say about drift in an…

41 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by coring_risk 17k · 14 months ago
31 votes 5 answers36k views
How does oral semaglutide at 5 mg weekly compare on cost per milligram across routes?

The specifics, since they change the answer: oral semaglutide · 5 mg. I would rather understand the derivation than memorise the outcome. Two people I asked gave two…

cost-analysis
cost-analysis

Cost arithmetic done honestly: cost per milligram after dead-space loss, list versus net price, comparing a multi-dose vial to a fixed-dose pen,…

261 questions
vendor-comparison
vendor-comparison

Side-by-side comparison of suppliers on measurable axes - independently confirmed purity and content, lead time, cold-chain handling,…

351 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by lipid_panel_q 44k · 16 months ago
31 votes 5 answers35k views
How do I compute the +5 charge state m/z for a peptide of 4113.6 Da?

Conditions: +5 · 4113.6 Da. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as well as the value…

mass-spec
mass-spec

Mass spectrometry for identity confirmation: electrospray ionisation, multiple charge states, monoisotopic versus average mass, deconvolution, and…

38 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
asked by w_okoye 40k · 2.0 years ago
31 votes0 answers31k views
How do I get 20 units out of a vial reconstituted to 2 mg/mL without guessing?

Stated plainly: 20 units · 2 mg/mL. This is a procedural question rather than a theoretical one, and I would like the procedure rather than the theory. What I have…

insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
asked by jo_vandeberg 19k · 21 months ago
31 votes5 answers29k views
If I reconstitute a 60 mg vial with 1 mL of bacteriostatic water, what concentration do I end up with?

What I am working with: 60 mg · 1 mL · bacteriostatic water. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order…

reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by hana_petrikova 19k · 20 months ago
31 votes 5 answers27k views
What is the dead-space loss per draw with a 25G drawing needle at 2 mg/mL?

The case in front of me: a 25G drawing needle · 2 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…

dead-space
dead-space

The volume trapped in the syringe hub and needle after the plunger bottoms out. It is small in absolute terms and large as a fraction of a small…

110 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by two_two_micron 15k · 22 months ago
31 votes 5 answers25k views
Does splitting a 60 mg weekly dose of mazdutide across two administrations change anything?

What I am working with: 60 mg · mazdutide. The empirical answer seems settled. The explanation does not. If the honest answer is that nobody knows, I would rather…

split-dosing
split-dosing

Dividing a weekly dose across more than one administration. Questions here concern the pharmacokinetic rationale, whether the peak-to-trough ratio…

39 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
asked by s_bhattacharya 42k · 21 months ago
31 votes 5 answers22k views
What does ESSENCE report at the 2 mg dose level?

Concretely: ESSENCE · 2 mg. I would like to know the limits of what can be inferred from this. What I am trying to avoid is over-reading a single result, which I have…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
titration
titration

Stepwise dose increases over weeks, why the label schedules exist at all, and what tolerability-driven deviation from a schedule looks like in…

444 questions
asked by Dr_Fatima_Belkacem 52k · 13 months ago
31 votes 4 answers22k views
What is the arithmetic to convert 50 mg in 1 mL into units on a U-100 scale?

The particulars: 50 mg · 1 mL. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator because I…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by gunnar_isaksen 16k · 11 months ago
31 votes3 answers8.9k views
My total testosterone fell 27% but my free androgen index fell 64%. Which is real?

Baseline, before starting treatment: total testosterone 2.6 nmol/L, SHBG 22 nmol/L. After eight months and 16 kg of weight loss: total testosterone 1.9 nmol/L, SHBG…

pcos
pcos

Polycystic ovary syndrome: insulin resistance as the shared mechanism, ovulatory and menstrual outcomes reported on treatment, androgen changes,…

14 questions
hormones
hormones

Endocrine changes accompanying substantial weight loss: sex hormone binding globulin, testosterone, oestradiol, cortisol and the reproductive…

14 questions
bloodwork
bloodwork

Laboratory monitoring: which panels are worth ordering, sensible intervals, reference-range versus optimal-range arguments, and how to read a…

284 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by carys_meredith 17k · 10 months ago
30 votes 5 answers68k views
Can I reconstitute mazdutide at 2.5 mg/mL and still measure a small dose accurately?

Details up front: mazdutide · 2.5 mg/mL. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me which work…

diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by pip_okonjo 11k · 2.3 years ago
30 votes 5 answers49k views
Does splitting a 8 mg weekly dose of orforglipron across two administrations change anything?

Numbers first: 8 mg · orforglipron. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would like to know how confident…

split-dosing
split-dosing

Dividing a weekly dose across more than one administration. Questions here concern the pharmacokinetic rationale, whether the peak-to-trough ratio…

39 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
asked by leonid_marchuk 15k · 23 months ago
30 votes 2 answers48k views
How do I get 40 units out of a vial reconstituted to 2.5 mg/mL without guessing?

The particulars: 40 units · 2.5 mg/mL. I want a method I can write down and repeat, not a rule of thumb. I would rather over-engineer this than discover a problem…

insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
asked by Dr_Nadia_Farsi 90k · 23 months ago
30 votes 5 answers45k views
What is the arithmetic to convert 50 mg in 5 mL into units on a U-100 scale?

The specifics, since they change the answer: 50 mg · 5 mL. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by valentina_rossi 16k · 22 months ago
30 votes 5 answers44k views
Is 8 mg/mL a sensible working concentration for survodutide, or should I go lower?

The particulars: 8 mg/mL · survodutide. I am trying to choose between two options that are usually discussed as though only one exists. I am not optimising for price,…

diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by jonas_ekstrom 18k · 23 months ago
30 votes5 answers43k views
How do I get 5 units out of a vial reconstituted to 1 mg/mL without guessing?

The particulars: 5 units · 1 mg/mL. I want a method I can write down and repeat, not a rule of thumb. I would rather over-engineer this than discover a problem later,…

insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
asked by swab_stopper 16k · 20 months ago
30 votes 5 answers39k views
If I reconstitute a 2 mg vial with 1 mL of sterile water for injection, what concentration do I end up with?

What I have: 2 mg · 1 mL · sterile water for injection. This should be a straightforward calculation and I keep getting two different answers. The numbers are…

reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by jana_horakova 15k · 16 months ago
30 votes 5 answers36k views
Is 50 mg weekly a defensible maintenance dose for ecnoglutide?

For reference: 50 mg · ecnoglutide. I am at the decision point and I would rather think it through than improvise. I would rather spend money on measurement than on…

maintenance-dose
maintenance-dose

Staying put: the lowest dose that holds a result, the difference between the maximum studied dose and the maximum useful dose, and what the…

44 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by sasha_ferreira 15k · 23 months ago
30 votes 5 answers36k views
Can I reconstitute tirzepatide at 4 mg/mL and still measure a small dose accurately?

For reference: tirzepatide · 4 mg/mL. I would like to define my thresholds before I have a result, for obvious reasons. I want a plan with explicit stopping rules,…

diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by pip_okonjo 11k · 19 months ago
30 votes 3 answers35k views
How much product does syringe dead space actually cost me? Fixed-needle versus luer-lock, in µL and mg

I have been using 1 mL luer-lock syringes with detachable 27 G needles because that is what came in the box, and someone told me offhand that I am "wasting a third of…

dead-space
dead-space

The volume trapped in the syringe hub and needle after the plunger bottoms out. It is small in absolute terms and large as a fraction of a small…

110 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
needle-gauge
needle-gauge

Gauge and length selection, the trade-off between draw time and tissue trauma, coring risk with larger-bore needles, and why a fixed-needle…

85 questions
asked by sample_id 17k · 22 months ago
30 votes 5 answers34k views
How much peptide am I losing to dead space on a fixed-needle syringe?

My setup is a refrigerator with a logger and a small work area I wipe down, nothing more. I have worked this out and I would like someone to find the error, because I…

dead-space
dead-space

The volume trapped in the syringe hub and needle after the plunger bottoms out. It is small in absolute terms and large as a fraction of a small…

110 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by pierce_count 15k · 13 months ago
30 votes 5 answers26k views
What is the dead-space loss per draw with a 31G needle at 10 mg/mL?

Details up front: a 31G needle · 10 mg/mL. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the…

dead-space
dead-space

The volume trapped in the syringe hub and needle after the plunger bottoms out. It is small in absolute terms and large as a fraction of a small…

110 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by klara_novotna 16k · 2.3 years ago