# What are odds of accidental 5mm injection into blood vessel? **URL:** \ **Category:** Type 1 & LADA\ **Created:** [June 21, 2019, 10:43pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742 "2019-06-21T22:43:12Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![T1Allison](https://avatars.discourse-cdn.com/v4/letter/t/c77e96/32.png) [@T1Allison](https://forum.fudiabetes.org/u/T1Allison)\ **Post date:** [June 21, 2019, 10:43pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/1 "2019-06-21T22:43:12Z")
I’ve often wondered this…but since I just had a gusher when I did my dinner injection…what are the odds of accidentally injecting into a blood vessel? I always assume when my injections bleed a bit that I’m just nicking something that I passed by…but this gusher was impressive…so here is my question… ---
**Author:** ![Jen](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/jen/32/4777_2.png) [@Jen](https://forum.fudiabetes.org/u/Jen)\ **Post date:** [June 21, 2019, 10:50pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/2 "2019-06-21T22:50:11Z")
I think the odds are pretty low… I’m pretty sure I’ve done it once, though. This was before CGM, so hard to tell exactly what happened. I tested for lunch and was 4.2 mmol/L. Did my injection and started to eat a few minutes later. About 15 minutes after the injection I started feeling _awful_, to the point I was scared I’d pass out. Tested again and I was 1.8 mmol/L. Ate my lunch plus a bunch of candy. Half an hour later I was still only 3.5 mmol/L or so. Ate more food. Then two hours later I tested at 26 mmol/L. It was like my lunch bolus absorbed insanely fast, was all used up after about 45 minutes, and then I skyrocketed as the food continued to hit. I’d still say once in almost 28 years is pretty low odds. ---
**Author:** ![Chris](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/chris/32/382_2.png) [@Chris](https://forum.fudiabetes.org/u/Chris)\ **Post date:** [June 21, 2019, 11:19pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/3 "2019-06-21T23:19:33Z")
Having watched minor surgeries for more than a few years, there are some quite impressive bleeds from blood sources that are just under the skin. You may have just gotten “lucky” ---
**Author:** ![T1Allison](https://avatars.discourse-cdn.com/v4/letter/t/c77e96/32.png) [@T1Allison](https://forum.fudiabetes.org/u/T1Allison)\ **Post date:** [June 21, 2019, 11:27pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/4 "2019-06-21T23:27:01Z")
My bg arc has behaved my version of normal…so I guess it was a lucky one! ---
**Author:** ![Jim\_YYC](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/jim_yyc/32/9553_2.png) [@Jim\_YYC](https://forum.fudiabetes.org/u/Jim_YYC)\ **Post date:** [June 21, 2019, 11:46pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/5 "2019-06-21T23:46:15Z")
@T1Allison - the odds are pretty slim. In over 50 years of mostly MDI injections, it’s happened 3 times to me (even with drawing back to check for blood). Each time saw a dramatic and rapid drop in BG (imagine what mainlining 15Units of Humalog would do to you). Severe hypos all 3 times, all required EMT’s and ER visits to bring me back. Don’t think it can’t happen. Blood vessels that don’t draw blood could be just a thin cellular layer away from direct access to your circulatory system. ---
**Author:** ![Jen](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/jen/32/4777_2.png) [@Jen](https://forum.fudiabetes.org/u/Jen)\ **Post date:** [June 21, 2019, 11:50pm UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/6 "2019-06-21T23:50:03Z")
> [@Jim\_YYC](#): > > Each time saw a dramatic and rapid drop in BG (imagine what mainlining 15Units of Humalog would do to you). Wow, were you injecting 15 u when this happened? Scary! I’m lucky that when (I think) it happened to me I was only injecting 5-6 u. ---
**Author:** ![Jim\_YYC](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/jim_yyc/32/9553_2.png) [@Jim\_YYC](https://forum.fudiabetes.org/u/Jim_YYC)\ **Post date:** [June 22, 2019, 12:36am UTC](https://forum.fudiabetes.org/t/what-are-odds-of-accidental-5mm-injection-into-blood-vessel/7742/7 "2019-06-22T00:36:31Z")
> [@Jen](#): > > Wow, were you injecting 15 u when this happened? Scary! Indeed I was (took around 15 units of Humalog every night before dinner, as back then I ate tons of carbs and other high glycemic foods). Trouble is when you deliver that dose direct to blood, things get out of control rather quickly 😝