An evaluation of the Spuncrit<sup>TM</sup>
 infra-red analyser for measurement of haematocrit

Weatherall, M.; Sherry, K.M.

doi:10.1111/j.1365-2257.1997.tb00004.x

Cited by 19 publications

(5 citation statements)

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“…A study carried out with children with malaria in endemic regions concluded that the conversion of Hb and Hct can also be influenced by variables such as gender and age [ 19 ]. However, the mean and median calculated in our study (2.94) coincide with the equation Hct = Hb × 2.941, proposed in a study on the accuracy of a method for measuring Hct and estimating Hb [ 21 ].…”

Section: Discussionsupporting

confidence: 80%

Comparison of Two Methods of Capillary Sampling in Blood Pre-Donation Anemia Screening in Brazil

et al. 2023

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Background: The laboratory tests most used by blood banks to diagnose anemia are the hemoglobin (Hb) and microhematocrit (Hct) tests, measured from capillary samples. Objective: To analyze the two capillary screening methods for pre-donation anemia by comparing their agreement in diagnosing anemia. Method: A cross-sectional study in a population of 15,521 blood donation candidates for whom information was available on Hb and Hct, performed from capillary blood samples. Hb was determined using the HemoCue® test and Hct by the centrifugation method. The Kappa coefficient was calculated to assess the agreement between the methods. Pearson’s correlation tests and gender-adjusted linear regression were used to assess the change in the response variable (Hb) as a function of the explanatory variable (Hct). Results: The majority of the study population were men (70.4%), aged between 18 and 44 years (72.1%), who declared themselves white or mixed skin color (85.6%), and had undergone at least 11 years of complete education (72.4%). The Kappa coefficient found was 92.7 and 99.2 for women and men, respectively. Pearson’s correlation showed a correlation coefficient of 0.98 and the linear regression graph showed an adequate relationship between the tests with R2 = 0.97. Conclusions: Comparing the Hb and Hct capillary tests, it was found that Hct can be safely used to screen for anemia in pre-blood donation.

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Section: Discussionsupporting

confidence: 80%

Comparison of Two Methods of Capillary Sampling in Blood Pre-Donation Anemia Screening in Brazil

et al. 2023

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“…Overall PA response from plexus layer will vary with the change in epidermal properties, but the trend of hematocrit-PA amplitude variation should remain similar. The resulting value of the hematocrit can further be divided by a factor of 2.941 to find out the approximate hemoglobin concentration in blood in g/dL [37]. Except this, the technique, including the quadratic curve can be used in similar noninvasive device oriented studies related to blood coagulation inside vessel, RBC aggregation, hemolysis, blood oxygenation and many more.…”

Section: Discussionmentioning

confidence: 99%

Acquiring photoacoustic signature of hematocrit variation from plexus layer of in-silico human skin phantom

Banerjee¹,

Sarkar²,

Karmakar³

2021

Biomed. Phys. Eng. Express

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Optical penetration inside human skin is constrained by the wavelength dependent scattering and absorption losses by tissue microstructure and chromophores. This computational study investigates whether the signature of hematocrit variation from plexus i.e., the first skin layer having very small blood volume percentage distributed in capillary vessels, is retained by the detected photoacoustic response. The in-silico skin phantom is irradiated by a light source equivalent to a small footprint and low power (below 5 W) continuous wave LASER diode. As the low fluence can be compensated by exploiting strong absorption by targeted chromophores (hemoglobin molecules), an irradiation of wavelength 405 nm has been used to generate detectable pressure from capillary blood vessels of plexus. Optical energy deposition inside the tissue has been modelled using Monte Carlo technique and the pressure wave is computed using k-wave. It is found that with the increase in hematocrit from 10% to 50%, photoacoustic amplitude monotonically increases and gets almost doubled. The increment is about 30% in the range of hematocrit of physiological interest (from 30% to 50%). The variation follows a quadratic relationship for the entire hematocrit range. This photoacoustic signature of hematocrit variation has further been validated against minimum detectable pressure (800 Pa). This numerical model is expected to be an important basis to realize the idea of low cost small footprint in-vivo photoacoustic hematocrit measurement device.

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“…For calculating the haematocrit, we used a haemoglobin‐based formula 18 :

Haematocrit = 2.941 \times haemoglobin ((), normalg / dL) .

…”

Section: Methodsmentioning

confidence: 99%

Calculated plasma volume status and outcomes in patients undergoing transcatheter aortic valve replacement

et al. 2021

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Aims This study investigated the prognostic value of plasma volume status (PVS) in patients who underwent transcatheter aortic valve replacement (TAVR). Methods and results Plasma volume status was calculated in 2588 patients who underwent TAVR using data from the Japanese multicentre registry. All-cause mortality and heart failure hospitalization (HFH) within 2 years of TAVR were compared among the PVS quartiles (Q1,

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An evaluation of the Spuncrit^TM infra-red analyser for measurement of haematocrit

Cited by 19 publications

References 1 publication

Comparison of Two Methods of Capillary Sampling in Blood Pre-Donation Anemia Screening in Brazil

Comparison of Two Methods of Capillary Sampling in Blood Pre-Donation Anemia Screening in Brazil

Acquiring photoacoustic signature of hematocrit variation from plexus layer of in-silico human skin phantom

Calculated plasma volume status and outcomes in patients undergoing transcatheter aortic valve replacement

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An evaluation of the SpuncritTM infra-red analyser for measurement of haematocrit

Cited by 19 publications

References 1 publication

Comparison of Two Methods of Capillary Sampling in Blood Pre-Donation Anemia Screening in Brazil

Comparison of Two Methods of Capillary Sampling in Blood Pre-Donation Anemia Screening in Brazil

Acquiring photoacoustic signature of hematocrit variation from plexus layer of in-silico human skin phantom

Calculated plasma volume status and outcomes in patients undergoing transcatheter aortic valve replacement

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An evaluation of the Spuncrit^TM infra-red analyser for measurement of haematocrit