The hemorheological theory of optimal hematocrit suggests that the best value of hematocrit (hct) should be that which results in the highest value of the hematocrit/viscosity (h/η) ratio. Trained athletes compared to sedentary subjects have a lower hct, but a higher h/η, and endurance training reduces the discrepancy between the actual hct and the ⪡ideal⪢ hct that can be predicted with a theor...

BACKGROUND/AIMS To compare mortality and cardiovascular risk in elderly dialysis patients with diabetes under two clinical strategies of anemia correction: maintaining hematocrit (Hct) between 34.5 and < 39.0% (high Hct strategy), and between 30.0 and <34.5% (low Hct strategy) using intravenous alpha epoetin. METHODS Observational data were used to emulate a randomized trial in which diabetic...

Equations of blood viscosity provide a prediction of the 'optimal' hematocrit' (hct) as the hct resulting in the highest value of the bell-shaped curve of hematocrit/viscosity ratio h/η. We investigated if overweight and obesity have an influence on these parameters. We compared 32 normal weight subjects, 40 overweight (BMI 25-30) and 38 obese subjects. There was no difference in the theoretica...

Physiological studies on fetal blood in narrow glass tubes have suggested that fetal optimal hematocrit (hct) might be as high as 60%. A theoretical 'ideal' hct can also be predicted with a theoretical curve of hematocrit/viscosity (h/η) ratio vs hct constructed with Quemada's model. We used the database of one of our previous papers on fetal hemorheology to reinterpret its results with this co...

BACKGROUND We performed a blood glucose meter hematocrit (HCT) interference test with lower sample manipulation requirements by using blood samples from patients with different blood glucose (BG) levels. METHODS Blood from five patients with different BG levels (2.8, 5.6, 8.3, 13.9, 19.4 mmol/liter) was manipulated to contain five different HCT concentrations (35/40/45/50/55%). Each sample w...

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. Dear Editor, the recent report on “hematocrit (HCT) level and cardiovascular risk among Thai taxi drivers” is very interesting1). Ishimaru et al. concluded that “obesity (p=0.007), daily alcohol drinking (p=0.003), and current or past smoking (p = 0.01...

Many studies reported that the hematocrit (HCT) is the most highly influencing factor affecting the accuracy of the glucose measurements by portable/handheld devices. It is also known as an important factor for clinical decision-making situations. Therefore, estimation of HCT plays a crucial role for enhancing accuracy of glucose measurements and performance of therapy. In this paper, we presen...

To the Editor: In a recent paper describing interesting experiments to measure the plasma and red cell transit in a cerebral ischemic area of the cat brain (Stroke 12: 218-223, March-April, 1981), Little et al. reported that the transit time of plasma as represented by I albumin was shorter than that of red cells labeled with "Tc even in the control State. This is just the opposite of data repo...

Utilization of intraoperative autotransfusion (IAT) during cardiac surgery with cardiopulmonary bypass (CPB) has been shown to reduce allogeneic red blood cell transfusion. Previous research has emphasized the benefits of using IAT in the intraoperative period. The present study was designed to evaluate the effects of using IAT on overall hematocrit (Hct) drift between initiation of CPB and the...

The level of hematocrit (Hct) is known to affect mean arterial pressure (MAP) by influencing blood viscosity. In the healthy population, an increase in Hct (and corresponding increase in viscosity) tends to raise MAP. However, data from a clinical study of type 2 diabetic patients indicate that this relationship is not universal. Instead, individuals in the lower levels of Hct range display a d...