Glucose is measured in whole blood, plasma or serum. Both amino acids are found in high concentrations in blood plasma and the brain. Interactions include that with grapefruit which increases tacrolimus plasma concentrations. Monitoring of the drug in plasma or serum is generally accomplished using chromatographic methods. Diphenhydramine can be quantified in blood, plasma, or serum. This leads to a difference in protein concentration between blood plasma and tissue. There is a relationship between the subcutaneous dose of calcitonin and peak plasma concentrations. The blood consists of ameboid cells and haemoglobin dissolved in the plasma. Blood is composed of cells suspended in a liquid called plasma. This antigen is expressed at high levels on normal human plasma cells. There are also processes involving oxygen plasma and corona discharge. The renal corpuscle is the site of the filtration of blood plasma. Correlation between severity of symptoms and measured ibuprofen plasma levels is weak. The vesicle membrane comes in contact with the plasma membrane. This results in a lower peak plasma concentration.