Mr.Crowley

How the test is performed:
Toxicology screening is most often performed on blood or urine (the specimens of choice) but can be performed on gastric contents (vomit or lavage fluids) if performed soon after the substance is ingested. Nails or hair can be tested for arsenic and mercury.

Adult or child:
Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and a tourniquet (an elastic band) or blood pressure cuff is placed around the upper arm to apply pressure and restrict blood flow through the vein. This causes veins below the tourniquet to distend (fill with blood). A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the tourniquet is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.


What the risks are:

excessive bleeding
fainting or feeling lightheaded
hematoma (blood accumulating under the skin)
infection (a slight risk any time the skin is broken)
multiple punctures to locate veins


LENGTH OF TIME DETECTED:
Blood:
Frequent User: Delta-9-THC = 4-8 hours post dose, then possible "baseline" level of 0.3 to 0.4 ng/ml. 11-nor-9-carboxy-THC = approximately 2 weeks + depending on past frequency of use.
Infrequent User: Delta-9-THC = 3-4 hours post dose 11-nor-9-carboxy-delta-9-THC = 2 -3+ days post dose

anduin

thanks man, that's some fairly useful information. i had a blood
test recently, but fortunately it wasn't anything to do with weed.