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Blood Testshttp://www.canorml.org/healthfacts/drug ... html#blood
Unlike urine tests, blood tests detect the active presence of THC in the bloodstream. In the case of smoked marijuana, THC peaks rapidly in the first few minutes after inhaling, often to levels above 100 ng/ml in blood plasma. It then declines quickly to single-digit levels within an hour. High THC levels are therefore a good indication that the subject has smoked marijuana recently. THC can remain at low but detectable levels of 1-2 ng/ml for 8 hours or more without any measurable signs of impairment in one-time users. In chronic users, detectable amounts of blood THC can persist for days. In one study of chronic users, residual THC was detected for 24 to 48 hours or longer at levels of 0.5 - 3.2 ng/ml in whole blood (1.0 - 6.4 ng/ml in serum) [Skopp and Potsch].
Note: THC blood levels can be measured in two ways. Most labs used by U.S. law enforcement report levels based on concentration in whole blood, but others report concentration in blood serum or plasma instead. Concentrations in whole blood are about half as high as those in serum/plasma. Therefore 0.5 - 3.2 ng/ml in whole blood = 1.0 - 6.4 ng/ml in plasma or serum. Unless otherwise stated, whole blood concentrations are reported here.
In another study of 25 frequent users, 36% showed no measurable blood THC throughout 7 days of abstinence, while the rest had at least one positive, though not necessarily on the first day. Six subjects (24%) had detectable blood THC after seven days at levels ranging from 0.2 to 1.5 ng/ml (that is, 0.4 to 3.0 ng/ml in serum) [Karschner]. There have been anecdotal reports of even higher day-after blood THC levels in chronic users, but these haven't been confirmed in controlled studies.
Unlike urine, blood test results can give a useful indicator of whether one is under the influence of marijuana. Studies have shown that high THC blood levels are correlated with impaired driving. An expert panel review of scientific studies on driving under the influence of cannabis concluded that THC levels above 3.5 - 5 ng/ml in blood (or 7 - 10 ng/ml in serum) indicate likely impairment [Grotenhermen]. The same review found no increased driving hazard at low levels of THC. Despite the fact that accident studies have repeatedly failed to find evidence of increased driving risk at low levels (1 or 2 ng in blood) of THC, numerous states and foreign countries have enacted "zero-tolerance" laws, treating any non-zero trace of THC as legal evidence for driving under the influence. Others have fixed, per se limits above which DUI is presumed, often with no scientific basis. However, most states (including California) don't have per se limits, but define DUI in terms of whether the totality of evidence (including drug test results) shows that the driver was impaired by marijuana or drugs.
Although high blood THC is a fairly good indicator of being under the influence, it is not infallible. Chronic users who develop tolerance to THC may in some cases drive safely with very high blood levels of THC. In one study, a subject with severe attention deficit disorder could not pass a driving test while straight, but performed well with a blood level of 71 ng/ml [Strohbeck-Kühner]. No similar phenomenon is known for alcohol.
Og lidt om sporingstid i spyttest, pistest mm.:http://www.erowid.org/plants/cannabis/c ... ting.shtml
In the past few years, new technologies have been developed which allow for saliva testing for the presence of Cannabis (THC). We do not currently have information about what the detection period is for these tests.
Cannabis is detectable in the blood for approximately 2-3 days after use in an infrequent user. Frequent use can be detected in the blood for approximately 2 weeks.
U.S. DRUG TESTING SUMMARY
Tested for in Standard Drug Tests? YES
Tested for in Extended Drug Tests? YES
Possible to Test for? YES
Detection Period in Urine 1-6 days (single use)
Detection Period in Urine 3-9 days (weekly use)
Detection Period in Urine 7-30 days (daily use)