Skip to content

Independent. We sell nothing and are affiliated with no manufacturer or pharmacy. Every moderation action is logged in public

Tags · Practice

dead volume

Residual liquid in hub and needle, and the dose it silently removes.

49 topics 13 solved Group: Practice

Devices 33 Practice 16

Related in this group: reconstitution · bacteriostatic water · sterile water · concentration maths · syringe units · titration · dose reduction · missed dose · injection site rotation · needle gauge & length · subcutaneous injection · storage

49 topics · page 2 of 2

Topic	Participants	Replies	Views	Activity
Revisiting: Filter needles: when they help and what they cost you Devices › Syringes & needles worked example needle gauge & length subcutaneous injection dead volume Closed Revisiting: Filter needles: when they help and what they cost you — setting out what I have, and where I think it stops being reliable. A question about technique rather than about dose. I have been doing the…	+48	52	6.6k	11mo
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
Foaming during reconstitution and whether it matters Practice › Reconstitution 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 Practice › Reconstitution 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
A ten-fold dose error caught before injection — one year on Devices › Syringes & needles dead volume needle gauge & length subcutaneous injection syringe units On the subject in the title: A ten-fold dose error caught before injection — one year on Working notes rather than a conclusion. A question about technique rather than about dose. I have been doing the same…	+151	157	9.4k	12mo
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Practice › Reconstitution 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
Second pass at: Pen dose counters: what a click does and does not guarantee Devices › Pens & autoinjectors dead volume storage subcutaneous injection Second pass at: Pen dose counters: what a click does and does not guarantee — setting out what I have, and where I think it stops being reliable. A question about technique rather than about dose. I have been…	+63	68	51k	13mo
Needle changes between doses on a reusable pen — does this still hold? Devices › Pens & autoinjectors dead volume missed dose storage Solved Wiki Needle changes between doses on a reusable pen — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. I have read the maintained page on this and I…	+1	5	38k	13mo
Storing a pen in use versus a pen unopened Devices › Pens & autoinjectors storage missed dose dead volume Storing a pen in use versus a pen unopened 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 these go…	+14	18	13k	14mo
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
Storing a pen in use versus a pen unopened — what changed since Devices › Pens & autoinjectors subcutaneous injection dead volume missed dose Posting this under the heading it deserves: Storing a pen in use versus a pen unopened — what changed since Everything below is what sits behind that. I have read the maintained page on this and I still have…		2	206	15mo
Second pass at: A pen that felt like it delivered nothing: diagnosing it afterwards Devices › Pens & autoinjectors dead volume storage subcutaneous injection missed dose Second pass at: A pen that felt like it delivered nothing: diagnosing it afterwards — setting out what I have, and where I think it stops being reliable. A question about technique rather than about dose. I…	+9	13	829	18mo
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 have read the maintained page on this and I still have a gap, so I am…	+117	121	7.3k	18mo
Follow-up: Dead volume across syringe and needle combinations Devices › Syringes & needles syringe units worked example subcutaneous injection dead volume Solved Dead volume across syringe and needle combinations — 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 these go…	+81	98	22k	18mo
Drawing from a pen cartridge with a syringe: how the risk profile changes Devices › Pens & autoinjectors subcutaneous injection dead volume missed dose Posting this under the heading it deserves: Drawing from a pen cartridge with a syringe: how the risk profile changes Everything below is what sits behind that. I have read the maintained page on this and I…		2	159	19mo
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
Second pass at: Choosing a concentration on purpose rather than by accident Practice › Reconstitution worked example dead volume reconstitution 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. Practical question with the units stated, because…	+44	48	1k	19mo
Priming a pen and whether the primed volume is wasted — one year on Devices › Pens & autoinjectors missed dose dead volume subcutaneous injection storage Solved Posting this under the heading it deserves: Priming a pen and whether the primed volume is wasted — one year on Everything below is what sits behind that. Practical question with the units stated, because I…	+3	7	5.4k	22mo
Pen mechanics when the cartridge is nearly empty Devices › Pens & autoinjectors storage subcutaneous injection dead volume Pen mechanics when the cartridge is nearly empty — setting out what I have, and where I think it stops being reliable. A question about technique rather than about dose. I have been doing the same thing for…		2	661	22mo