It was concluded that presence ofcannabinoids in urine or blood is not unequivocal proof of active cannabissmoking. Giardino 25 26 found THC-acid levels of up to 30-50ng/ml from passive-exposed subjects, and recommended a threshold of 65ng/ml to differentiatebetween active and passive smoking of cannabis.ticht & Kaferstein 20 estimated that the blood THC concentrationsproduced in a 70kg person smoking 15mg THC would peak at 7-8 minutes,after 30 minutes between 14-42ng/ml, and at 60 minutes between 7.5-14ng/ml.3.3 McBay 21 compared THC and THC-COOH levels in a study involving smokedmarijuana cigarettes.
Calculation Using An ovulation Calendar: 1  The first day of a period is considered as day 1. 2  Usually on day 14, the egg is released and is waiting for the sperm to fertilize it. 3  The egg has a lifespan of just 12 to 24 hours whereas a sperm can last for about 72 hours in a woman.
However, doing this involves carefully tracking your menstrual cycle over a long period of time. Identification. To determine your âsafeâ days for having unprotected sex, you need to track your menstrual cycle. The first day that you get your period is Day 1 and the days keep counting until you get your period again, which starts your next cycle. For most women who have a 28-day cycle, ovulation occurs anywhere from Day 14 to Day 16. You can further predict your date of ovulation by tracking your basal body temperature every morning and checking your cervical mucus. Your âunsafeâ days are from five days before ovulation to three days after. The other timesâduring your period, about a week after and a week beforeâare generally âsafeâ to have unprotected sex. Considerations. Sperm can live inside your body for up to five days, so itâs important to consider that when using fertility awareness to prevent pregnancy. This means that you shouldnât have sex from five days before you think you are going to ovulate. Misconceptions