laboratory diagnostic - drugs - Fosfomycin, serum 2ml. The serum must be frozen within 4 hour after collection and must be sent in the frozen samples container. 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), Microbiological method, ssso, todylaboratories®, bmn, code L16LD1413