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.
As a result, most people, including health professionals, will date your pregnancy based on your LMP (last menstrual period) instead (NHS 2013a) . To work out how many weeks pregnant you are by this measure, try to remember when your last period started. The first day of your LMP counts as day one of your pregnancy.You can find out your estimated due date using our handy due date calculator. Some women prefer to count their pregnancy from the day that they were likely to be ovulating during the month in which they became pregnant.This will give you an estimated date of conception, which will usually be about two weeks after the first day of your LMP.So you will be two weeks further along in your pregnancy if it's calculated according to your LMP rather than your estimated date of conception.he first day of your LMP counts as day one of your pregnancy. You can find out your estimated due date using our handy due date calculator. Some women prefer to count their pregnancy from the day that they were likely to be ovulating during the month in which they became pregnant.