Practice · subcategory

Reconstitution

Diluent choice, volumes, resulting concentrations, worked examples, and the errors we see most often.

33 topics2,212 posts6 solved Moderators: s.leclerc, KLindqvist About this category

reconstitution concentration maths syringe units bacteriostatic water worked example dead volume

33 topics · page 1 of 2

Topic	Participants	Replies	Views	Activity
About the Reconstitution category reconstitution concentration maths syringe units Pinned Wiki Diluent choice, volumes, resulting concentrations, worked examples, and the errors we see most often. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is…	+1	5	15k	16h
Reconstituting a multi-strength kit without mixing yourself up — what changed since concentration maths syringe units bacteriostatic water On the subject in the title: Reconstituting a multi-strength kit without mixing yourself up — what changed since Working notes rather than a conclusion. Practical question with the units stated, because I…	+42	46	1k	7h
A 10 mg vial reconstituted three different ways, compared bacteriostatic water worked example concentration maths Posting this under the heading it deserves: A 10 mg vial reconstituted three different ways, compared Everything below is what sits behind that. Practical question with the units stated, because I have seen…	+30	34	55k	17h
Coming back to: Why I now write the concentration on the vial in marker reconstitution syringe units bacteriostatic water worked example The question in the title: Why I now write the concentration on the vial in marker I will give what I have already checked below so nobody repeats it. Practical question with the units stated, because I have…	+8	12	4.3k	1d
How much of the diluent volume the powder itself displaces concentration maths bacteriostatic water dead volume worked example Asking directly, because I could not find a straight answer: How much of the diluent volume the powder itself displaces Practical question with the units stated, because I have seen how quickly these go wrong…		2	1.8k	1d
A 5 mg vial and a 0.25 mg dose: the arithmetic in full syringe units worked example reconstitution bacteriostatic water Solved A 5 mg vial and a 0.25 mg dose: the arithmetic in full Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how…	+124	141	16k	2d
Why I now write the concentration on the vial in marker syringe units bacteriostatic water concentration maths Asking directly, because I could not find a straight answer: Why I now write the concentration on the vial in marker Practical question with the units stated, because I have seen how quickly these go wrong…	+1	5	30k	11d
Coming back to: Swirling versus inverting versus leaving it alone reconstitution concentration maths syringe units Solved Swirling versus inverting versus leaving it alone Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how quickly…	+20	24	16k	26d
[2026 update] A vial that will not fully dissolve: what to check and in what order concentration maths dead volume bacteriostatic water syringe units Solved Posting this under the heading it deserves: A vial that will not fully dissolve: what to check and in what order Everything below is what sits behind that. Practical question with the units stated, because I…	+114	128	20k	1mo
Choosing a concentration on purpose rather than by accident concentration maths worked example syringe units Solved On the subject in the title: Choosing a concentration on purpose rather than by accident Working notes rather than a conclusion. Reporting something rather than asking about it, in case the pattern is useful…		2	719	1mo
Reconstitution volumes that produce round numbers, tabulated reconstitution syringe units bacteriostatic water worked example Reconstitution volumes that produce round numbers, tabulated — setting out what I have, and where I think it stops being reliable. Practical question with the units stated, because I have seen how quickly…	+103	112	1.7k	3mo
Foaming during reconstitution and whether it matters — the long version reconstitution bacteriostatic water worked example concentration maths Foaming during reconstitution and whether it matters — the long version — setting out what I have, and where I think it stops being reliable. Reporting something rather than asking about it, in case the…	+100	117	6k	3mo
Converting between mg/mL and units per dose, both directions — the long version reconstitution worked example syringe units dead volume Converting between mg/mL and units per dose, both directions — the long version Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated,…	+110	132	1.7k	3mo
Second pass at: Choosing a concentration on purpose rather than by accident reconstitution syringe units concentration maths Second pass at: Choosing a concentration on purpose rather than by accident Writing it up because I had to work it out twice and would rather nobody else did. A question about technique rather than about…	+49	54	6k	4mo
Coming back to: Reconstitution volumes that produce round numbers, tabulated concentration maths syringe units bacteriostatic water dead volume On the subject in the title: Reconstitution volumes that produce round numbers, tabulated Working notes rather than a conclusion. Practical question with the units stated, because I have seen how quickly…		2	24k	6mo
Why "add 2 mL" is not an instruction reconstitution worked example syringe units dead volume The question in the title: Why "add 2 mL" is not an instruction I will give what I have already checked below so nobody repeats it. A question about technique rather than about dose. I have been doing the…	+23	27	3.5k	6mo
Follow-up: The decimal-point error, and the habit that catches it concentration maths bacteriostatic water dead volume reconstitution Closed On the subject in the title: The decimal-point error, and the habit that catches it Working notes rather than a conclusion. I have read the maintained page on this and I still have a gap, so I am asking…	+118	131	50k	7mo
Coming back to: Over-dilution: when your dose falls below one readable graduation worked example dead volume syringe units bacteriostatic water Over-dilution: when your dose falls below one readable graduation Writing it up because I had to work it out twice and would rather nobody else did. I have read the maintained page on this and I still have a…	+90	97	1.1k	7mo
The decimal-point error, and the habit that catches it syringe units concentration maths worked example bacteriostatic water The decimal-point error, and the habit that catches it Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how…	+110	121	10k	7mo
[2026 update] How much of the diluent volume the powder itself displaces reconstitution worked example syringe units Wiki Closed The question in the title: How much of the diluent volume the powder itself displaces I will give what I have already checked below so nobody repeats it. Practical question with the units stated, because I…	+89	100	3.2k	8mo
A 10 mg vial reconstituted three different ways, compared — the long version reconstitution syringe units worked example concentration maths A 10 mg vial reconstituted three different ways, compared — the long version — setting out what I have, and where I think it stops being reliable. Reporting something rather than asking about it, in case the…	+146	158	47k	9mo
Coming back to: Checking someone else's arithmetic: a worked example thread concentration maths reconstitution bacteriostatic water dead volume Posting this under the heading it deserves: Checking someone else's arithmetic: a worked example thread Everything below is what sits behind that. Practical question with the units stated, because I have seen…	+13	17	293	11mo
Reconstituting a multi-strength kit without mixing yourself up reconstitution concentration maths syringe units Wiki Reconstituting a multi-strength kit without mixing yourself up Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen…	+108	123	30k	11mo
Foaming during reconstitution and whether it matters concentration maths bacteriostatic water reconstitution syringe units Posting this under the heading it deserves: Foaming during reconstitution and whether it matters Everything below is what sits behind that. I have read the maintained page on this and I still have a gap, so I…	+19	24	466	11mo
Why "add 2 mL" is not an instruction — a second dataset concentration maths bacteriostatic water worked example dead volume Why "add 2 mL" is not an instruction — a second dataset — that is the question, and I have not found it answered plainly anywhere I have looked. Reporting something rather than asking about it, in case the…		2	13k	11mo
Checking someone else's arithmetic: a worked example thread reconstitution syringe units concentration maths worked example Checking someone else's arithmetic: a worked example thread Writing it up because I had to work it out twice and would rather nobody else did. Practical question with the units stated, because I have seen how…	+74	78	895	11mo
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version concentration maths bacteriostatic water syringe units On the subject in the title: A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Working notes rather than a conclusion. Reporting something rather than asking about it, in case the…	+160	165	1.9k	12mo
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since dead volume bacteriostatic water reconstitution syringe units Closed Posting this under the heading it deserves: A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Everything below is what sits behind that. I have read the maintained page on this and I…	+86	93	25k	13mo
A vial that will not fully dissolve: what to check and in what order reconstitution bacteriostatic water syringe units Solved A vial that will not fully dissolve: what to check and in what order — setting out what I have, and where I think it stops being reliable. Practical question with the units stated, because I have seen how…	+12	16	40k	15mo
Over-dilution: when your dose falls below one readable graduation concentration maths syringe units bacteriostatic water dead volume On the subject in the title: Over-dilution: when your dose falls below one readable graduation Working notes rather than a conclusion. I have read the maintained page on this and I still have a gap, so I am…	+15	19	248	15mo

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