Tomorrow I'm going to do a finger pricker test kit for B12, folate and ferritin (and have another for D3 as well if I can get enough blood!). Anyway last time I tried this I had a lot of problems using the Blue Horizon finger prickers that have blue bottoms and white tops. Maybe I just panicked (certainly felt pretty anxious doing the whole routine as I didn't want to mess it up) but I couldn't get them to work! In the end I resorted to using some unused finger prickers of a different type from another older test, which thankfully worked.
I did watch the video associated with the test but I'm still not 100% clear. You remove the cover from the lower (blue) part (that the lancet will pop out from), you place that end against the side of either your middle or ring finger, pressing it firmly... then... how do you release the lancet ? Do you have to push down on the white part? It doesn't help that the instruction leaflet shows a different pricker and mentions a 'purple button end' that must be pressed! (MediChecks kit). However the lancet they provide is the blue and white type. When I tried last time nothing happened and I had to resort to the other type (I have none left now).
The D3 kit (city assays) also has the same type of pricker. I really want to know EXACTLY what I need to do for success! If someone could explain it would be wonderful!