laboratory diagnostic - drugs - Caffeine , serum 1ml, FROZEN, The serum must be frozen within 4 hour after collection and must be sent in the frozen samples container(!). Do not use gel separators tubes. Centrifuge the sample and settle the serum without delay. All requests must ALWAYS contain: sampling date and time; the date and time of the last dose; the reasons for the prescription (efficiency and/or toxicity test); the treatment start date and/or the date of any change of dosage; the subject's age, height and weight, when possible; the dosage data (quantity administered, frequency, administration route). HPLC - High Performance Liquid Chromatography/UV detection, ssso, todylaboratories®, bmn, code L16LD1359