Conventional statistical methods, however, cannot appropriately adjust for confounding due to postbaseline prognostic factors that affect treatment levels and are, themselves, affected by past treatment, for example, hematocrit
when comparing dynamic strategies for epoetin.
gondii induced robust IFNa production [Figure 1]a that correlated kinetically with decreased hematocrits
[Figure 1]b and numbers of circulating RBC [Figure 1]c.
An increase in hematocrit
almost invariably follows testosterone supplementation.
When we look at the renal literature, we see that 10%-20% of kidney transplant patients develop polycythemia --an increase of both red and white cells, with hematocrit
values of more than 51% or 52%."
The change in the patients' hematocrit
observed after central line placement was attributed to the ongoing microangiopathic hemolysis, since blood loss was minimal.
is 1% to 3% higher than the hematocrit
from automated instrument due to plasma that is trapped in the erythrocytes in the normal situation.
If the reason for this additional testing was a factor known to cause inaccuracy (e.g., operator error, hematocrit
outside the labeled interval, shock, and so forth), then a difference between the 2 methods might be expected.
In 1997, Medicare's Hematocrit
Measurement Audit of patients on dialysis produced a policy that discontinued reimbursement for epoetin alfa therapy when the 90-day rolling average hematocrit
was above 36.6% (Collins, Ma, Xia, & Ebben, 1998).
Figure 2 shows how the apparent viscosity, the relation between shear stress and shear rate, increases with the hematocrit
. It is seen that human whole blood (HWB) has a higher viscosity than HWB without fibrinogen, a protein important for cell aggregation.
However, the important role of the kidney is demonstrated by the increased hematocrit
of a renoprival patient following a successful transplant.
NEW ORLEANS -- Patients with a very low or a very high hematocrit
are at higher risk for death after a stroke, and anemic patients are at greatest risk, according to a study that was presented at the conference.
It is possible to estimate the whole blood creatinine concentration at equilibrium, with knowledge of the water concentrations of plasma and red blood cells, hematocrit
, the initial plasma creatinine concentration, and the plasma creatinine concentration after addition of creatinine.