Topic summary

Coming back to: Swirling versus inverting versus leaving it alone

Practice › Reconstitution reconstitution concentration maths syringe units Solved

This is a generated summary. It shows the 5 most-liked posts from a topic of 25, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.

a.mwangiTL2 Solution15 Mar 2026#3

The opening post describes the usual case. This is about the unusual one.

Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.

7 likes 4mo

cannula_driftTL3Regular22 Mar 2026#4

a.mwangi, post #3: The opening post describes the usual case. This is about the unusual one. Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does. Go to post

Swirling versus inverting versus leaving looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.

22 likes in reply to #3 4mo

b.solbergTL29 Apr 2026#7

Answering the question post #5 raises rather than the one it answers.

Swirling until fully clear before drawing is worth the extra minute. A partially dissolved preparation is not uniform and the first dose out of it is not the same as the last.

Small point, but it is the one that usually catches people.

30 likes 4mo

microgramsTL2Regular10 May 2026#13

A definition problem is doing most of the work in this Swirling versus inverting versus leaving discussion. Once the term is pinned down I suspect the disagreement mostly goes away and what is left is small.

26 likes 3mo

b.oylerTL1Member28 May 2026#17

The number people quote for Swirling versus inverting versus leaving is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly uninformative on its own.

19 likes 2mo

Read the full topic (25 posts)

Suggested topics

Topic	Participants	Replies	Views	Activity
About the Reconstitution category Practice › Reconstitution 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
Converting between mg/mL and units per dose, both directions Practice › Reconstitution concentration maths dead volume bacteriostatic water Solved Posting this under the heading it deserves: Converting between mg/mL and units per dose, both directions Everything below is what sits behind that. Practical question with the units stated, because I have…	+106	142	9.5k	19mo
Coming back to: Checking someone else's arithmetic: a worked example thread Practice › Reconstitution 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
Coming back to: Why I now write the concentration on the vial in marker Practice › Reconstitution 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. Writing this out with the numbers in it, because…	+8	12	4.3k	1d
Choosing a concentration on purpose rather than by accident Practice › Reconstitution 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. Working notes on choosing a concentration rather than a conclusion. I would…		2	719	1mo

Related topics — sharing the tags reconstitution, concentration maths, syringe units

Topic	Participants	Replies	Views	Activity
Fixed versus detachable needles: the trade-offs Devices › Syringes & needles dead volume subcutaneous injection syringe units worked example Solved Posting this under the heading it deserves: Fixed versus detachable needles: the trade-offs Everything below is what sits behind that. I was wrong about fixed versus detachable needles in a thread last spring…	+117	121	7.3k	18mo
Over-dilution: when your dose falls below one readable graduation Practice › Reconstitution 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
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Data & Tools › Calculators worked example site feedback syringe units Revisiting: Bug report: the reconstitution calculator and a rounding edge case — setting out what I have, and where I think it stops being reliable. Posting the calculation with the inputs, so that somebody…	+109	122	5.8k	17mo
A ten-fold dose error caught before injection Devices › Syringes & needles needle gauge & length worked example syringe units dead volume Closed A ten-fold dose error caught before injection — setting out what I have, and where I think it stops being reliable. Trying to work out what would count as evidence on ten-fold dose error caught, before…	+95	103	26k	10mo
About the Calculators category Data & Tools › Calculators worked example concentration maths syringe units Pinned Wiki Reconstitution, dose equivalence, titration planning, mass-error checking and storage lookup. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with…	+2	7	733	5mo