Sorry to hear about your bad experience.
Interesting to know; Did you have unexpected values when testing the control samples or blood samples?
Blood samples. I didn’t get any control samples and didn’t expect much of a learning curve. I figured I can run IVs and did numerous finger sticks for years for my grandmother and father.
After following the instructions given by Jerry himself, I got the following sequence of tests at rest:
4.2
2.5
3.8
If these were done over multiple hours, I could believe it.
It’s enlightening to do serial tests throughout the day (which I’ve done for research with Inigo San Millan).
E.g. Caffeine elevates my resting lactate and I can easily get acute resting values in the 4’s.
However, if these are taken in rapid succession, it is odd.
Prior to the instructions, during a ramp test, the results were:
4.2
10.3
3.5
7.8
3.1
8.7
2.3
4.9
3.1
3.3
7.8
If I saw this without having any additional knowledge, I would assume that the samples were contaminated with sweat. To avoid this, it is best to ensure that you are taking the drop from a properly formed bubble, When sweat contaminates it tends to burst the bubble and you’re trying to collect a sample that is spread across the finger.
I’m not immune to this either; I certainly have a contaminated sample everyone once in a while. Good wiping (Clean, Wipe, Prick, Wipe…Wipe again, Sample) and fans go a long way!
Interesting, Sweat Lactate concentration can be quite high (10mmol/L), so this drives lactate values up.
Following that, on an off day, I decided to take some resting samples this evening to work on my technique and see if I could get consistent results, I got the following:
3.1
20.1
0.5
1.8
1.2
0.7
1.5
2.2
2.4
3.0
2.4
1.3
Considering this was at rest, it does not seem that sweat contamination is likely, so very odd values.
I should have started with control samples I guess. I just figured that they would want to look at the meter. But alas, I’m out $400. Hopefully nobody else goes through this kind of nonsense.
Unfortunately, this is the only way to know and why we keep detailed records. For years I did this in a JCAHO certified lab (when we were using YSI 2300’s) , which was maddening at times, but worth it at the end of the day.
FWIW, I love FastTalk-it’s an honor having you reply to my thread!
The honor is mine!
I’m actually reviewing our episode on “Perception and Performance” coming out on Thursday the 15th.