pH-adjusted ionized calcium
نویسنده
چکیده
منابع مشابه
Actual ionized calcium (at actual pH) vs adjusted ionized calcium (at pH 7.4) in hemodialyzed patients.
typed double-spaced (including references) with conventional margins. The overall length is limited to five manuscript pages, including not more than one figure or one table. To the Editor: Ionized calcium is now the measurement of choice for evaluating calcium metabolic diseases (1, 2). Ionized calcium may be reported either as the actual ionized calcium, referred to the actual pH of the patie...
متن کاملEffects of storage temperature and time before centrifugation on ionized calcium in blood collected in plain vacutainer tubes and silicone-separator (SST) tubes.
We studied the stability of ionized calcium and pH in samples stored at either room temperature or 4 degrees C, in centrifuged and uncentrifuged blood-collection tubes and in centrifuged tubes containing a silicone-separator gel (SST tubes). At room temperature, in uncentrifuged blood from healthy individuals, mean ionized calcium usually increased no more than 10 mumol/L per hour; at 4 degrees...
متن کاملDetermination of ionized calcium in serum that has been exposed to air.
We examined changes in ionized calcium concentration in serum after its exposure to air. Samples with total protein concentrations ranging from 50 to 90 g/liter were equilibrated with CO2 in nitrogen (5/95, by vol) or CO2 alone, to produce pH values of 7.0 to 8.0. Ionized calcium was then measured with an Orion flow-through electrode system. Curves relating pH and ionized calcium concentration ...
متن کاملWhen is it appropriate to order an ionized calcium?
Convincing evidence demonstrates that ionized calcium and not total calcium is the physiologically relevant component of blood calcium. Direct measurement of ionized calcium, however, is limited by difficulties in accurate analysis, lack of standardization, and need for special handling, all resulting in increased cost; therefore, strategies have been developed to estimate ionized calcium from ...
متن کاملChanges in protein-bound calcium in the serum of haemodialysis patients.
1. Ionized calcium, protein-bound calcium and total calcium in serum were measured in patients receiving haemodialysis treatment. 2. During dialysis, the ionized calcium fraction decreased and the bound calcium increased. The blood pH also increased. 3. Studies in vitro suggested that the fall in ionized calcium and rise in protein-bound calcium were larger than could be explained by the redist...
متن کامل