THC Drug Test. A marijuana drug test is the technical analysis of a biological specimen, such as urine, blood, hair, sweat or saliva, to determine the presence or absence of the active ingredients of marijuana (mainly THC) or its metabolites (breakdown products).t is important to note that urine tests are usually conducted to test for the presence of THC metabolites which indicates marijuana use. Blood tests are conducted when the amount of THC still present in the system has to be ascertained.
How is my due date calculated? Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. If you deliver on your due date, your baby is actually only 38 weeks old, not 40.
Estimated conception date: This is 266 days (38 weeks) subtracted from the selected pregnancy due date (the average human gestation period per Naegele's Rule). Last period date: This is 14 days prior to conception (assuming ovulation occurred on day 14 of your menstrual cycle).nstructions: Select the month, day, and year your baby is due, and then click the Calculate Conception Date button. Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the calculator.