Hemoglobin-Dilution Method: Effect of Measurement Errors on Vascular Volume Estimation

Table 1

Statistical measures of log-normal (LN) distributions for estimation of initial volumes of blood (BV), plasma (PV), and red cells (RCV) due to measurement-precision errors.

Added- error SD (%)	BV (l); ^†X /  S	^‡% BV error; /  S	PV (l); X /  S	% PV error; /  S	RCV (l); X /  S	% RCV error; /  S
0.5	5 / 1.04	−4.1 to +4.3	3 / 1.03	−2.8 to +2.9	2 / 1.12	−11 to +12
1	5.02 / 1.09	−8.4 to +8.8	3.01 / 1.06	−5.5 to +5.9	1.97 / 1.27	−21 to +27
1.5	5.05 / 1.14	−12.0 to +14.0	3.01 / 1.09	−8.2 to +8.9	1.94 / 1.47	−32 to +47

Error-free BV = 5 l and PV = 3 l (Hct = 40%);  g/l,  g/l; ; ^†X is the geometric mean and S is the dispersion (shape) factor of the volume distributions; / signifies the bounding values of 68.3% of the volume values that are in the range of to ; ^‡the range of % errors for /  S bounds.