Ketostix are crap, get ones from medical labs, professional ones. Strangely they are cheaper than Ketostix!
Oh, and for those who are keen to know why I bought them:
http://www.patient.co.uk/doctor/Urine-Ketones-What-They-Mean-and-False-Positives.htm
http://www.ncbi.nlm.nih.gov/books/NBK247/
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2995232/
http://www.diabetesexplained.com/ketone-test.html
If you all took time to read, you will know that several things can disrupt the reading, but that's not exactly the point, when I spoke to my GP she said to keep measuring every day and if they all been showing beige or light pink and one day it's purple THEN something happened!
That's what I'm talking about.
Of course it's possible to be on the diet and the strips never accusing you to be in ketosis, but a lot of people have for instance mild cases of diabetes and don't event think about it and don't even suspect they have. For those people, if doing the diet things go all dandy and everything normal, and one day they wake up their level of ketonuria is so sky high, they can damage their kidneys and ultimately die because on healthy individuals ketosis is totally fine, but on people on those conditions is a definite no-no.
So, I decided to play safe even though I been tested for diabetes.
I bought strips from a medical lab (my mother is a nurse) and I get tested every morning for 7 different factors, ketones, glucose, etc etc.
I know my readings and everyone should get familiar with theirs too, so if one day mine is way off the scale I will check into it.
Paranoid? Maybe I am, but £5 is 20m work off my wages so I will just add that safety net.
Needless to say, don't rely on any test alone whatsoever, go to your GP once every 2-3 weeks for a check up.