The ionic composition of interstitial and intravascular fluids is the same. Proteins, however, are kept with the vascular compartment, at least to a degree, by the vascular wall, which is a semi-permeable membrane. The concentration of proteins is much higher in the plasma sector than in the interstitial sector.
Detection of marijuana using swab drug test can vary from person to person taking into account the different conditions like general health, different fluid intake, metabolism, etc.
The good news is that none of our home drug test kits (hair, urine, or saliva) will pick up exposure to second hand marijuana smoke as a positive result. Here is what the test manufacturer said on the subject: âIt [second hand marijuana smoke] would not register on our tests. We had a test where someone was placed in a isolated room with THC smoke was being pumped in for 24 hours straight and the person did not register. On a lab test it did pick up about 3 or 4 nanograms but as you know instant tests are set at 50ng/ml.â.