Quantitation in blood, urine or other body fluid by any method (except reagent tablet or reagent strip) of any of the following being used therapeutically by the patient from whom the specimen was taken: amikacin, carbamazepine, digoxin, disopyramide, ethanol, ethosuximide, gentamicin, lithium, lignocaine, netilmicin, paracetamol, phenobarbitone, primidone, phenytoin, procainamide, quinidine, salicylate, theophylline, tobramycin, valproate or vancomycin - 1 test (Item to be subject to rule 6)