Reference ValuesHemoglobinometryAutoanalysisGestational AgeUltrasonography, PrenatalReproducibility of ResultsThyrotropinPregnancyAge FactorsSex FactorsBlood Flow VelocityProspective StudiesReference StandardsInfant, NewbornAlgorithmsSensitivity and SpecificityModels, BiologicalTime FactorsComputer SimulationSoftwareModels, StatisticalKineticsModels, TheoreticalPredictive Value of TestsQuality ControlTreatment OutcomeCalibrationImage Processing, Computer-AssistedSequence Analysis, DNARetrospective StudiesAnalysis of VarianceRegression AnalysisBody WeightBiological MarkersMolecular Sequence DataLinear ModelsModels, Genetic