,,, for me,,, buy bottles of test strips, they have to be used within a certain time frame once opened and thats another thing am not sure dr. office does.. anyway, yes i have ipad stopwatch on from 120 seconds down and the strip has little squares that colour more if problems, I am careful doing the testing - there an info sheet in the bottle. What I have done in past is take a photo of the strip lying on paper towel and showed it to the nurse, it save having the test again. Of course am a trusted patient... however, with damage from radiation to bladder from years ago, sometimes will show a little bit of blood on the test strip one day and not the next, but it is accurate. Like anything, IF you see something amiss, can ask dr for lab test but given all we read about these days, are the labs even 100 per cent "trustworthy" - I am beginning to have many doubts about many areas in the medical field - used to believe everything was told but not any more and it's not a nice feeling. ps I dont buy bottled with huge amounts of strips although cheaper as cant use them all up in the time frame