Quantity not sufficient rates and delays in sweat testing in US infants with cystic fibrosis.

Background: Diagnostic sweat testing is required for infants with positive newborn-screening (NBS) tests for cystic fibrosis (CF). Infants have "quantity not sufficient" (QNS) sweat volumes more often than older children. A comprehensive study of QNS sweat volumes in infants has not previously been reported.

Subclinical hypothyroidism and risk for incident ischemic stroke among postmenopausal women.

Background: Subclinical hypothyroidism (SCH) is postulated to increase stroke risk via atherogenic changes associated with abnormal thyroid function. However, the direct relationship of SCH with subsequent stroke is poorly studied.

Methods: In this nested case-cohort study, we prospectively evaluated the association between any SCH and severity of SCH in relation to incident ischemic stroke risk among postmenopausal women in the Women's Health Initiative Observational Study.

Sixty-five years since the New York heat wave: advances in sweat testing for cystic fibrosis.

The sweat test remains important as a diagnostic test for cystic fibrosis (CF) and has contributed greatly to our understanding of CF as a disease of epithelial electrolyte transport. The standardization of the sweat test, by Gibson and Cooke [Gibson and Cooke (1959) Pediatrics 1959;23:5], followed observations of excessive dehydration amongst patients with CF and confirmed the utility as a diagnostic test. Quantitative pilocarpine iontophoresis remains the gold standard for sweat induction, but there are a number of collection and analytical methods.

Subclinical hypothyroidism and risk for incident myocardial infarction among postmenopausal women.

Context: Subclinical hypothyroidism (SCH) has been associated with an increased risk for cardiovascular disease. However, few studies have specifically examined the association between SCH and myocardial infarction (MI), and the relationship is poorly understood.

Objectives: The purpose of this study was to evaluate incident MI risk in relation to SCH and severities of SCH among postmenopausal women.

The need for quality improvement in sweat testing infants after newborn screening for cystic fibrosis.

The proportion of insufficient sweat tests after positive newborn screening for cystic fibrosis was determined. Infants ≤ 3 months old had a mean (± standard deviation) rate of 7.2% (± 7.

Guidelines for diagnosis of cystic fibrosis in newborns through older adults: Cystic Fibrosis Foundation consensus report.

Newborn screening (NBS) for cystic fibrosis (CF) is increasingly being implemented and is soon likely to be in use throughout the United States, because early detection permits access to specialized medical care and improves outcomes. The diagnosis of CF is not always straightforward, however. The sweat chloride test remains the gold standard for CF diagnosis but does not always give a clear answer.

Teaching method validation in the clinical laboratory science curriculum.

With the Clinical Laboratory Improvement Amendment's (CLIA) final rule, the ability of the Clinical Laboratory Scientist (CLS) to perform method validation has become increasingly important. Knowledge of the statistical methods and procedures used in method validation is imperative for clinical laboratory scientists. However, incorporating these concepts in a CLS curriculum can be challenging, especially at a time of limited resources.

Association of leukocyte count with progression of aortic atheroma in stroke/transient ischemic attack patients.

Background And Purpose: Leukocyte count is an independent predictor of stroke. We investigated the association between leukocyte count and progression of aortic atheroma over 12 months in stroke/transient ischemic attack (TIA) patients.

Methods: Consecutive ischemic stroke and transient ischemic attack patients underwent 12-month sequential transesophageal echocardiography and were assessed for total and differential leukocyte counts on admission.

Sweat-testing in preterm and full-term infants less than 6 weeks of age.

Our objective was to examine the characteristics of preterm and full-term infants < or = 6 weeks old that influence the success of obtaining sufficient sweat for diagnosis of CF, and corresponding sweat chloride concentrations. A retrospective chart review of 119 sweat tests was performed on 103 preterm and full-term infants < or = 6 weeks of age. Bivariate and multivariate regression analyses were used to determine the predictors of successful sweat testing and characteristics influencing sweat chloride concentrations.

The clinical consequences and diagnosis of hypothyroidism.

Hypothyroidism represents a common disorder especially in older women. Left untreated, it can lead to abnormalities in lipid metabolism and subsequent progression to overt hypothyroidism, with significant clinical consequences of myocardial infarction and stroke. More research needs to be performed to investigate the link between subclinical hypothyroidism and cardiovascular disease risk and to evaluate the health and economic outcomes of randomized trials of TSH screening.