Sherry L. Perkins

Learn More
OBJECTIVE To determine the influence of maternal smoking on fetal erythropoietin concentrations in health term pregnancies and test the correlation between cotinine, a biomarker of maternal smoking, and erythropoietin levels in fetuses. METHODS We invited women with healthy term pregnancies to participate in the study, excluding those with conditions(More)
BACKGROUND Increased total homocysteine (tHcy) may be associated with placental-mediated adverse pregnancy outcomes, but few prospective studies have measured tHcy before pregnancy outcome. This study was undertaken to determine whether increased tHcy measured in early pregnancy is associated with pregnancy loss, gestational hypertension (GH), preeclampsia,(More)
The Lower North Shore region of the St. Lawrence River is home to a fish-eating population that displays an unusually high body burden of several organochlorines, including polychlorinated biphenyls (PCBs) and dioxin-like compounds (DLCs). We measured biomarkers indicative of liver enzyme induction and investigated the relationship with organochlorine body(More)
Vascular access thrombosis is the most common and costly complication in hemodialysis patients. The role of thrombophilia in access thrombosis is not established. A case-control study was conducted of 419 hemodialysis patients to determine whether thrombophilia was associated with arteriovenous fistula or graft thrombosis. Participants were enrolled from(More)
OBJECTIVE The objective of the study was to evaluate the association between folic acid supplementation in early second trimester and the risk of developing preeclampsia. STUDY DESIGN We carried out a prospective cohort study between October 2002-December 2005. We recruited women who had their prenatal care visit (12-20 weeks' gestation) at the Ottawa(More)
OBJECTIVE To examine the association between parents' report of their child's secondhand smoke exposure and various adjustments of cotinine concentrations in random urine samples. METHODS Urine cotinine and creatinine were measured in 109 six to 11-year-old children from predominantly upper middle-class families. Cotinine values were considered as: (a)(More)
We describe a rapid quantitative and qualitative "high-performance" liquid-chromatographic (HPLC) method for measuring porphyrins in urine. Direct injection of acidified, filtered urine onto a 3-micron (particle size) 3-cm-long reversed-phase column fully resolves uroporphyrin, hepta-, hexa-, and pentacarboxylic acid porphyrins, and coproporphyrin.(More)
OBJECTIVE The objective of this study was to determine whether serum and red blood cell folate levels were decreased in pregnant women who smoke and whether total plasma homocysteine levels were elevated. STUDY DESIGN In this cross-sectional study, serum folate, red blood cell folate, and homocysteine were measured in pregnant first- and early(More)
Maternal smoking is associated with adverse perinatal outcomes. Because of concerns of underreporting, investigators routinely perform biochemical testing to confirm smoking status, such as serum cotinine, a major metabolite of nicotine, adding an increased cost to examine compliance. The objectives of this study were to determine the sensitivity and(More)
One-carbon metabolism is a network of metabolic pathways, disruption of which has been associated with cancer and other pathological conditions. Biomarkers of these pathways include homocysteine (HCY), S-adenosylmethionine (SAM), and S-adenosylhomocysteine (SAH). A better understanding of the relationships between these biomarkers is needed for their(More)