Hemoglobin Estimation
Hemoglobin Estimation - Related Videos
01:24
Hemoglobin
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2024
Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well. When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
06:37
Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
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Cited by 31 •
2013
Here we describe a growth assay for Staphylococcus aureus using hemoglobin as the sole source of available nutrient iron. This assay establishes the role of bacterial factors involved in hemoglobin-derived iron acquisition.
04:51
Modeling Neonatal Intraventricular Hemorrhage Through Intraventricular Injection of Hemoglobin
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2025
This video demonstrates a method to generate a rat model of neonatal intraventricular hemorrhage. In this procedure, an anesthetized rat pup is injected with hemoglobin into the lateral ventricle of the brain. The hemoglobin causes oxidative stress and releases heme, simulating intraventricular hemorrhage. The resulting damage to brain tissues, driven by reactive oxygen species and inflammatory cytokines, leads to ventricular enlargement, a common consequence of intraventricular hemorrhage.
05:18
A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering
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Cited by 1 •
2016
A photo-thermal angular light scattering (PT-AS) sensor enables the rapid and chemical-free hemoglobin assay of nanoliter-scale blood samples. Here, details of the PT-AS setup and a measurement protocol for the hemoglobin concentration in blood are provided. Representative results for anemic blood samples are also presented.
01:06
What are Estimates?
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2023
It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate the mean height or mean weight of the individuals in the sample. This sample data acts as a representative measure of the population parameter. These sample statistics are known as estimates. The estimate for the mean of a sample is denoted by ͞x, whereas the mean of the population is designated as μ. Further, parameters such as the mean,...
FAQs
The colored compound creates a measurable optical signal that can be analyzed consistently. After red blood cells are lysed, hemoglobin is converted into this stable form so its light absorbance can be compared with a calibration standard. Stabilizing the color supports more reliable concentration measurements than relying on an unstable or changing visual signal.
Lysis breaks open red blood cells and releases their hemoglobin into the test mixture. This makes the pigment available for conversion into the colored compound measured by the assay. Without adequate release, some hemoglobin would remain within intact cells, potentially reducing the measured signal and weakening the accuracy of the concentration estimate.
The assay measures how strongly the prepared colored compound absorbs light, then relates that absorbance to a calibration standard. The standard provides a reference for interpreting the measured signal, allowing the sample’s hemoglobin concentration to be determined. This comparison converts an optical measurement into a result useful for evaluating hematological changes.
A common workflow begins with a blood sample, followed by lysis of the red blood cells. The released hemoglobin is then converted into a stable colored compound. Finally, the compound’s light absorbance is measured and compared with a calibration standard. These linked stages provide the basis for calculating the hemoglobin concentration.
Results can support the detection and assessment of anemia, polycythemia, blood loss, and nutritional deficiencies. The measurement is therefore useful when researchers or clinical investigators need an indicator of hematological status. Interpreting the result in these contexts helps identify changes in blood-related health, although the assay itself provides a concentration measurement rather than a complete diagnosis.
In research settings, the measurement helps evaluate hematological changes, monitor treatment, and compare physiological responses across populations. Because hemoglobin reflects blood oxygen-carrying capacity, differences in concentration can provide a useful biological outcome when studying health status or treatment-related changes. Consistent colorimetric measurement also supports comparisons among samples and study groups.