The readings do not need to be exactly the same as in the chart. Each dog may show slightly different readings. But it is important to find the moment of maximum peak and the subsequent fall. If reading values start decreasing ovulation is imminent. The best moment for insemination is when the readings fall close to the initial level.
It is not out of the ordinary for some dogs to have ‘false heat’ and show small peaks and drops in their readings. Continue testing to ensure you are pinpointing the actual peak and subsequent drop in results.
The maximum is variable on each particular bitch and it is not the high value of the readings that it is important, but determining the PEAK where afterwards the readings begin to fall.
Some bitches will peak at 500, some 650, some 870, some 1200 some 1790, etc., etc..
The key is determining the peak and the subsequent fall after the peak.
24/48 hours AFTER THE PEAK
is the time to mate the bitch, regardless of if she is in day 7, 17 or 27. Also regardless of what external signs she is showing.
That is an exact finite point in time where the Leutinising hormone (LH) is released naturally which triggers the ovaries to release the eggs for ovulation to occur.