V4 Pen Accuracy
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I recently received my first pens, two V4s, purchased from PeptideCritic. I tested the accuracy of both, multiple times and both seem to dispense 1-2 units short no matter the dose size. The larger the dose the closer it gets.
I currently have some peptides that my rat's dose is 6-13 units so a couple units makes a difference. Just wondering if its normal and is the best way to handle it to select 1 unit higher just to get closer to the desired unit amount.
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I always set it to one unit higher. Also, the speed of the injection matters. It seems to be more accurate with a faster push. Momentum I suppose.
@Nuncles in my testing I agree that a faster, harder push gave better result but out of 4 tests for each pen I think 1 pen landed dead on. 1 out of 8 tests being dead on was disappointing so I guess I'll just up the units to compensate
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I recently received my first pens, two V4s, purchased from PeptideCritic. I tested the accuracy of both, multiple times and both seem to dispense 1-2 units short no matter the dose size. The larger the dose the closer it gets.
I currently have some peptides that my rat's dose is 6-13 units so a couple units makes a difference. Just wondering if its normal and is the best way to handle it to select 1 unit higher just to get closer to the desired unit amount.
@stevetenerovich The needle still holds some too. Prime it first, then test and prime before use.
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Weird I test my pens all the time with a spare cartridge filled with BAC I think you aren’t testing correctly, they are very accurate. Like @randy said shoot liquid in the syringe to prime it then push it out you will notice about 1 IU is in the syringe tip and then test. I have never noticed the speed situation I always go slow.
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@stevetenerovich I am a bit of a hypocrite here, but try not to dose things too small. I was talking to a friend about how the V4 leaves about 10 units in the vial and he remarked, “That’s almost 3 doses.” And I remarked, “Dude.” This happens with GHRH a lot. The problem with it is two fold. First, a 3-4 unit dose is basically within the error margin for being sloppy and loss in the system(needle, speed, sloppiness), and second, Well, I forget what was second, so i guess it’s time for my Semax.
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@stevetenerovich I am a bit of a hypocrite here, but try not to dose things too small. I was talking to a friend about how the V4 leaves about 10 units in the vial and he remarked, “That’s almost 3 doses.” And I remarked, “Dude.” This happens with GHRH a lot. The problem with it is two fold. First, a 3-4 unit dose is basically within the error margin for being sloppy and loss in the system(needle, speed, sloppiness), and second, Well, I forget what was second, so i guess it’s time for my Semax.
@ResearchCat starting my first dose of Selank today
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@stevetenerovich I would never reconstitute a 6-13 unit dose for a pen as mentioned above. Add more bac.
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@stevetenerovich I would never reconstitute a 6-13 unit dose for a pen as mentioned above. Add more bac.
@Mydogdaryl423 10 is my minimum I hear ya
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Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
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@Nuncles in my testing I agree that a faster, harder push gave better result but out of 4 tests for each pen I think 1 pen landed dead on. 1 out of 8 tests being dead on was disappointing so I guess I'll just up the units to compensate
@Nuncles in my testing I agree that a faster, harder push gave better result but out of 4 tests for each pen I think 1 pen landed dead on. 1 out of 8 tests being dead on was disappointing so I guess I'll just up the units to compensate
I wouldn't sweat it. Human error probably provides more inaccuracy in the dosing than the pens. Meaning, we never really know the EXACT amount of product in a particular vial. Look at COA's. Multiple tested vials often contain different amounts from the same testing lab, not to mention different amounts from 1 lab to the other. In the big scheme of things, it shouldn't be a big deal. If your research subject is that sensitive to that small amount of difference, then perhaps it's not the right peptide for your subject. And in my testing, the accuracy issues have been essentially the same for most pens, not just the V4. It's an inexpensive mechanical mass produced device. They won't all be perfect. My 2 cents.
BTW, I've always accounted for the needle quantity and primed my syringe before testing.
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Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
I was running into the same issue until I just went ahead and ordered a 25 pack of 10ml vials. Check out farris labs, medlab supply, or peptide test for those, or other size vials.
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Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
What were you reconning that you added 3ml bac water and were only hitting 6-13 units? If I am going to end up with a figure like that I split into 2 3ml carts and add more bac.
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Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
I was running into the same issue until I just went ahead and ordered a 25 pack of 10ml vials. Check out farris labs, medlab supply, or peptide test for those, or other size vials.
@Nuncles i go the cheap way, it's a little more hassle but using 5ml, or 10ml syringes and leaving the extra bac in the syringe, then draw it back in to mix. I'd go the vial route but I'm a cheap skate and $50 is peptide money
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@Nuncles i go the cheap way, it's a little more hassle but using 5ml, or 10ml syringes and leaving the extra bac in the syringe, then draw it back in to mix. I'd go the vial route but I'm a cheap skate and $50 is peptide money
@ManicXmedic Never thought of that. Smart. Thanks for the tip.
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Thanks for the feedback. I reconstitute with 3ml of bac for those smaller doses. I didn't have empty larger vials to transfer into and add additional bac so the smaller doses are what I'm stuck at. I prefer 10-20 units for my ideal volume when I can.
What were you reconning that you added 3ml bac water and were only hitting 6-13 units? If I am going to end up with a figure like that I split into 2 3ml carts and add more bac.
@Mydogdaryl423
This is the way^^^^^ -
@ManicXmedic Never thought of that. Smart. Thanks for the tip.
@Nuncles glad it was received well, but I can't take credit, was a tip I picked up here on the forums
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Yes, you can draw some air in the syringe and turn it over a few times allowing the bubble to mix the peptide/bac. Also when drawing the pep in the vial in you can push it back in again to draw it out again if you want. Of course this still gets filtered into pen carts afterwards
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