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reconstitution

Page 2 of 14 · 330 questions tagged reconstitution.

330 questions · sorted by votes · page 2 of 14

35 votes5 answers28k views
How many units on a U-40 insulin syringe is a 4 mg dose at 1 mg/mL?

Stated plainly: a U-40 insulin syringe · 4 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of…

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 Dr_Idris_Coulibaly 40k · 15 months ago
34 votes 5 answers67k views
How do I photograph a vial so someone can actually assess it?

I have photographs before and after reconstitution if the visual detail matters. Everything I have found on this is either a forum aside or a product page, neither of…

vial-inspection
vial-inspection

What you can learn by looking: cake morphology, meniscus films, fibres versus stopper fragments versus true particulates, clarity after…

66 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
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

445 questions
asked by ben_akintola 14k · 2.4 years ago
34 votes 5 answers38k views
How many units on a low-dead-space syringe is a 50 mg dose at 1 mg/mL?

What I am working with: a low-dead-space syringe · 50 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked…

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 m_haraldsen 38k · 21 months ago
34 votes 5 answers25k views
What is the arithmetic to convert 5 mg in 1 mL into units on a U-100 scale?

What I am working with: 5 mg · 1 mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude and it…

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 gel_pack_warm 13k · 17 months ago
34 votes 5 answers16k views
Is 1 mg/mL a sensible working concentration for oral semaglutide, or should I go lower?

The case in front of me: 1 mg/mL · oral semaglutide. I would like the axes of comparison first and the recommendation second. I have tried the first option and it…

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 Dr_Hanne_Solberg 40k · 18 months ago
34 votes 5 answers16k views
What is the arithmetic to convert 10 mg in 5 mL into units on a U-100 scale?

Conditions: 10 mg · 5 mL. Please show the division. I want to check my own against yours. I would like the general form as well as the specific number, so I can apply…

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 eoin_mcgarry 16k · 17 months ago
33 votes5 answers24k views
How many units on a low-dead-space syringe is a 8 mg dose at 1 mg/mL?

Conditions: a low-dead-space syringe · 8 mg · 1 mg/mL. Please show the division. I want to check my own against yours. I would like the general form as well as the…

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 pierce_count 15k · 13 months ago
32 votes 2 answers49k views
What is the arithmetic to convert 8 mg in 5 mL into units on a U-100 scale?

Numbers first: 8 mg · 5 mL. I can do the algebra. I am not confident about the conversion factors. If there is a standard way to lay this out, I would rather learn…

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 low_dead_space 42k · 23 months ago
32 votes 5 answers46k views
How many units on a U-100 insulin syringe is a 60 mg dose at 5 mg/mL?

The particulars: a U-100 insulin syringe · 60 mg · 5 mg/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 marta_szymanska 17k · 2.3 years ago
32 votes 4 answers37k views
How long should full dissolution take, and what if it is slower?

I keep a written log of every draw with date, volume and syringe type. I want a method I can write down and repeat, not a rule of thumb. I would rather over-engineer…

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
lyophilisation
lyophilisation

Freeze-drying: primary and secondary drying, collapse temperature, the role of bulking agents and cryoprotectants such as mannitol and trehalose,…

17 questions
peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
asked by amara_nwachukwu 41k · 23 months ago
32 votes 5 answers37k views
Is 20 mg/mL a sensible working concentration for retatrutide, or should I go lower?

What I have: 20 mg/mL · retatrutide. I have used one of these for a while and I am considering switching, which requires a reason. What I care about is…

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 nominal_ten 14k · 17 months ago
32 votes0 answers25k views
How many units on a U-40 insulin syringe is a 8 mg dose at 6.67 mg/mL?

Concretely: a U-40 insulin syringe · 8 mg · 6.67 mg/mL. Please show the division. I want to check my own against yours. I would like the general form as well as the…

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 net_peptide 16k · 18 months ago
32 votes5 answers24k views
If I reconstitute a 4 mg vial with 3 mL of phosphate-buffered diluent, what concentration do I end up with?

The specifics, since they change the answer: 4 mg · 3 mL · phosphate-buffered diluent. I would rather understand the derivation than memorise the outcome. Two people…

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 sasha_ferreira 15k · 10 months ago
32 votes0 answers16k views
Is a 0.22 µm syringe filter worth using on a reconstituted research vial?

This is the third vial from the same lot, so I can compare against two known-good ones. I would like to know whether this claim survives contact with evidence. If the…

sterility
sterility

Sterility as a test result rather than an adjective. Covers what a sterility test actually measures, why "sterile filtered" on a document is close…

122 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
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

445 questions
asked by carys_meredith 17k · 2.0 years ago
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 answers30k views
Do I need to let a refrigerated vial come to room temperature before drawing?

I have the same lot stored correctly as a comparator, if a side-by-side test would help. I have done this once and I suspect I got away with it rather than got it…

storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 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
injection-technique
injection-technique

Technique questions: angle, pinch versus flat, aspiration, injection speed, air bubbles, and the handling steps that determine whether you deliver…

90 questions
asked by claudia_ferrante 46k · 12 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 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
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 answers41k views
How do I tell a stopper fragment from a genuine particulate?

I have photographs before and after reconstitution if the visual detail matters. I have read the primary source rather than the summary, which has left me with more…

vial-inspection
vial-inspection

What you can learn by looking: cake morphology, meniscus films, fibres versus stopper fragments versus true particulates, clarity after…

66 questions
sterility
sterility

Sterility as a test result rather than an adjective. Covers what a sterility test actually measures, why "sterile filtered" on a document is close…

122 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 haze_check 17k · 18 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 2 answers16k views
Can I reconstitute with 0.9% sodium chloride instead of water for injection?

I keep a written log of every draw with date, volume and syringe type. I want to know what the trade-off actually is rather than which option is fashionable. I would…

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
bacteriostatic-water
bacteriostatic-water

Water for injection containing roughly 0.9 per cent benzyl alcohol as a bacteriostatic agent. It suppresses growth in a multiple-withdrawal vial;…

112 questions
peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
asked by seamus_brady 17k · 17 months ago
30 votes 5 answers15k views
If I reconstitute a 5 mg vial with 1 mL of bacteriostatic water, what concentration do I end up with?

Stated plainly: 5 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 of…

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 greta_holzmann 15k · 18 months ago