Source to measure 0.25u accurately?

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If you mean a syringe on which you can measure 0.25 u accurately, I think you're out of luck. I see you're using Lantus and that calls for U100 syringes which are available with half units markings. You probably have these. Measuring 0.25 u requires eyeballing between two half unit marks and it's possible to do this fairly precisely if you hold the syringe up in front of a bright light and maybe use some sort of magnifying lens like a jeweller's loupe. Even reading glasses can help. Some people even use calipers to be as precise as possible but many use the eyeballing method. Another method is to draw some coloured water into a syringe up to one mark, then let it out drop by drop until you reach the next half unit mark. You count drops as you go so you then know how many between two half unit marks. Half that number of drops is about 0.25 u.
 
Yes! Using low-dose 3/10 syringes. I am holding up to a bright light & marking off 0.75u with a Sharpie & then drawing up insulin. It's working, but I am OCD about the unit measurement. I will just have accept that this is as accurate as it gets.

Thank you very much for your response.
 
Tina & Doodles said:
Yes! Using low-dose 3/10 syringes. I am holding up to a bright light & marking off 0.75u with a Sharpie & then drawing up insulin. It's working, but I am OCD about the unit measurement. I will just have accept that this is as accurate as it gets.

Thank you very much for your response.
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Glad to help! We can only do what we can do. Just try to be as consistent as possible with your measurements. :)
 
@Tina & Doodles -

For each syringe double-check the position of the measurement markings on the syringe relative to the end of the syringe barrel; sometimes they can be off by a significant amount (sometimes by as much as 0.25 or even 0.5oIU). Some members use digital calipers to improve their dose measurement accuracy.

There is very helpful information on this subject in the following L&L forum sticky:

Syringe & Insulin Info: Handling, Drawing, and Fine Doses


Mogs
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Here is a post on Dosing with Calipers, for those of us OCD scientists in the crowd. :p My girl is fairly sensitive to small changes in dose, ECID, so calipers make a huge difference. Plus the line markings difference that Mogs talks about. My current box of syringes has at at least .25U of daylight between the bottom of the "zero" line and the end of the barrel. Note that it's not important that you make exactly .25U changes, but rather that you are consistent on how you draw that same dose each time.

If you are using the BD Ultrafine syringes, there is a paper ruler created by the German Diabetes Katzen board that can be used. More methods for drawing small doses are described in the paper called Management of Diabetic Cats, page 255, that is attached to the TR Protocol Sticky Note in the L/L forum.
 
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