https://www.selleckchem.com/products/jzl184.html Results were compared with those from C-peptide immunoassay. Polyethylene glycol precipitation of IAS plasma, but not control plasma, depleted C-peptide immunoreactivity consistent with immunoglobulin-bound C-peptide immunoreactivity. LC-MS/MS detected proinsulin and des 31,32 proinsulin at higher abundance in IAS plasma compared with control plasma. Analysis by gel filtration chromatography coupled to LC-MS/MS demonstrated proinsulin and des 31,32 proinsulin, but no C-peptide, in plasma immunocomplexes. Antibody binding can enrich proinsulin and des 31,32 proinsulin in IAS immunocomplexes. Proinsulin cross-reactivity in some C-peptide immunoassays can lead to artifactually increased C-peptide results. Antibody binding can enrich proinsulin and des 31,32 proinsulin in IAS immunocomplexes. Proinsulin cross-reactivity in some C-peptide immunoassays can lead to artifactually increased C-peptide results. The objective of this study was to investigate the relationship between parental stress and health-related quality of life (HRQOL) among children with sickle cell disease (SCD). A cross-sectional correlational survey research design was used for this quantitative study. One hundred-fifty patients between the ages of 8-17 years old and their caregivers were enrolled from an outpatient comprehensive sickle cell program within a hospital setting. Patients completed the Pediatric Quality of Life Scale 3.0 SCD Module, whereas parents completed the Parental Stress Scale and demographic information questionnaire. Multiple regression analysis was used to determine if parental stress scores predicted the HRQOL of children diagnosed with SCD after controlling for demographic variables. The sample included 150 patients (median age 12 years old; female 52%) who were diagnosed with SCD along with 150 of their caregivers. Higher levels of parental stress predicted lower HRQOL scores (p < .001). As parents reported elevated levels of st