Not about Paula, but only for explaining something to all the "not expert" posters about what happens in every WCh.
The top athletes have ALWAYS blood tests BEFORE the race. This happens in every Championship, but also in the Major Marathon (for example, one year Viktor Rothlin was tested one hour after midnight, only 7 hours before the start of London Marathon).
So, it's absolutely normal that the best athletes, chosen by IAAF, must have a blood test before the race.
Instead, what happens AFTER the race doesn't depend on a choice of IAAF, but on another factor : the position of the athlete in the race.
In this case, we must still look at two different situations :
1) Positions that every athletes know there is of sure the doping control (top 3 in every competition, or in some case top 6, but Always following precise informations which everybody can have BEFORE the race)
2) Positions drawn by the responsibles of IAAF antidoping, not communicated to anybody before the race. In this case, if for example the draw includes position 6, 9 and 14, athletes can't know it, and only after the arrival the referees assigned to antidoping go to communicate to the athletes in the drawn positions they must go to doping control.
3) All the test AFTER the race are, normally, with urine only. In case of WR, also after the race we have both the test : urine and blood. Instead, before the race there are the most part of blood tests.
I want to remind that, if we search some illegal substance, we can find it in the urine only. Blood tests have the goal to individuate strange parameters, such as to create some doubt or suspicion about the athlete, and in this case normally WADA, IAAF and National Antidoping Agency increase the number of OOC tests with the athletes, Always with urine, sometimes with blood too, in order to have data enough for building the BP.
About the specific case of Vilamoura, I can't say if Paula was tested immediately after the race, or 90 minutes later. The two races were run in different times, and women started after the end of the men race. What I can say is that the 6 selected athletes for the control, including the top 3, went to the doping room BEFORE the finish of the race, since the last athlete ran about 1:25, so we were in the doping room about 25 minutes after the arrival of the top athletes.
Also, I remember that the start for men was at 10am (and the temperature of 22° can be related to that time of the day), while the start for women was at 11:30am, and the temperature was about 29° at the start, continuing to raise till, arguably, 32°.