BACKGROUND It is ionized calcium that is physiologically active and under homeostatic control; however, total calcium is more conveniently measured. Formulae for correction of calcium to account for albumin binding have not been validated in a dialysis setting. METHODS We measured ionized calcium simultaneously with total calcium (t[Ca]), albumin, total protein and pH before dialysis in 50 st...

We studied the relation of serum total calcium, dialyzable calcium, and dialyzable magnesium in 61 well and sick newborn infants aged 7-76 h. The infants' serum total calcium, dialyzable calcium and magnesium concentrations (ion chromatography method) were studied in comparison with the infant's history and sickness scale. We found that serum total calcium and dialyzable magnesium were lower in...

BACKGROUND Ionized calcium (iCa) is measured frequently in hospitalized patients, and hypocalcemia is frequently found, seemingly supporting the practice. METHODS We retrieved the results of 58 040 iCa tests and records of intravenous (IV) and oral calcium supplementation from laboratory and hospital information systems and evaluated them for frequency of testing, frequency of hypocalcemia, a...

Data are presented on the effects on 12 normal subjects of a 3-mm period of venous occlusion of the arm. Concentrations of both total calcium and total protein in serum are significantly increased, while serum magnesium and phosphorus and plasma ionic calcium concentrations remain unchanged. Concentrations of both total calcium and total protein are significantly greater in the serum of men tha...

the main objective of this study was to identify the incidence of post-thyroidectomy hypocalcemia in patients underwent lobectomy, subtotal thyroidectomy or total thyroidectomy. this randomized trial study was performed from may 2010 to july 2011 among 108 consecutive patients undergoing thyroidectomy. patients were allocated into 3 groups based on the 3 common type of thyroidectomy. pre and po...

Plasma calcium (ionised and total) and albumin concentrations and pH were measured in preterm infants and in healthy adults and patients dependent on respirators. Plasma ionised calcium and total calcium values fell during the first week after birth and subsequently rose. Plasma ionised calcium concentrations in preterm infants were higher than those found in both healthy and sick adults. This ...