Cobas b221 (Roche Diagnostics) - Detail of modules from the top: * MMS module, Urea, Glucose, and Lactate, enzimatic electrode. * ISE module, Na+, K+, Cl- and Ca2+ selective electrodes. * GS module, pH, pO2, pCO2, electrodes * SPF module: spectrophotometric module, (Hb, HHb, O2HB, CNHb, COHb, MetHB, BilT) Emergency laboratory, Hospital de Niños, Córdoba, Arg.