Analyze, in the necroscopic reports of the Death Verification Service of the State of Tocantins (SVO-TO), the records of biological samples collected for histopathological examination and records of autolysis in histopathological results and correlate them with records of causes of mortality and morbidity. Cross-sectional observational analytical study conducted in 494 autopsy reports completed and filed in SVO-TO, Brazil, between 2012 and 2016. Records of the number of biological samples collected for histopathology, number of autolysis, number of causes of mortality and number of causes of morbidity were extracted and identified. For the analysis of the relationship between the variables, descriptive and analytical statistics were used in SAS SYSTEM software. The mean number of mortality records was 5.72 ± 2.42 (CV 42.32%), causes of morbidity: 0.2 ± 0.5 (CV 251.46%), number of biological samples collected: 2.66 ± 1.13 (CV 42.59%), number of autolysis: 1.74 ± 1.05 (CV 60.06%). The number of mortality and morbidity diagnoses recorded in SVO reports increases the higher the number of samples collected by necropsies physicians. The number of biological samples collected by necropsy positively impacts the number of causes of mortality and morbidity. Collecting more than seven tissue samples by necropsy does not impact the number of causes of mortality and morbidity. The low numbers of autolysis records suggest efficacy in the collection of biological samples in SVO-TO.