science

Hemoglobin electrophoresis

Hemoglobin electrophoresis is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hemoglobin electrophoresis rather than just read about it. In short: Hemoglobin electrophoresis is a blood test that can detect different types of hemoglobin. The test can detect hemoglobin S, the form associated with sickle cell disease, as well as other abnormal types of hemoglobin, such as hemoglobin C.

Key takeaways

Hemoglobin electrophoresis belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hemoglobin electrophoresis to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hemoglobin electrophoresis from memory before moving on to harder problems.

Reference excerpt

Hemoglobin electrophoresis is a blood test that can detect different types of hemoglobin. The test can detect hemoglobin S, the form associated with sickle cell disease, as well as other abnormal types of hemoglobin, such as hemoglobin C. It can also be used to investigate thalassemias, which are disorders caused by defective hemoglobin production.

Procedure The test uses the principles of gel electrophoresis to separate out the various types of hemoglobin and is a type of native gel electrophoresis. After the sample has been treated to release the hemoglobin from the red cells, it is introduced into a porous gel (usually made of agarose or cellulose acetate) and subjected to an electrical field, most commonly in an alkaline medium. Different hemoglobins have different charges, and according to those charges, they move at different speeds in the gel and eventually form discrete bands (see electrophoretic migration patterns). A quality control sample containing hemoglobins A, F, S, and C is run along with the patient sample to aid in identifying the different bands. The relative amounts of each type of hemoglobin can be estimated by measuring the optical density of the bands, though this method is not reliable for hemoglobins that are present in low quantities. Because hemoglobins exhibit different migration patterns depending on the pH level, testing the same sample at both an acid and an alkaline pH can help to identify some abnormal hemoglobins that would otherwise be impossible to distinguish from others.

Clinical significance Adult human blood normally contains three types of hemoglobin: hemoglobin A, which makes up approximately 95% of the total; hemoglobin A2, which accounts for less than 3.5%; and a minute amount of hemoglobin F. If abnormal hemoglobin variants such as hemoglobin S (which occurs in sickle cell disease), C or E are present, they will appear as unexpected bands on electrophoresis (provided they do not migrate to the same place as other hemoglobins). Hemoglobin electrophoresis can also be used to investigate thalassemias, which are caused by decreased production of subunits of the hemoglobin molecule. Hemoglobin A2 levels are typically elevated in beta-thalassemia minor and hemoglobin F may be slightly increased. In beta-thalassemia major, hemoglobin A is decreased (or in some cases absent) and hemoglobin F is markedly elevated; A2 levels are variable. In hemoglobin H disease, a form of alpha-thalassemia, an abnormal band of hemoglobin H can be detected, and sometimes a band of Hemoglobin Barts; but in the milder alpha-thalassemia trait, electrophoresis results are effectively normal.

History Linus Pauling is credited with the invention of hemoglobin electrophoresis in 1949. Newer alternatives to conventional hemoglobin electrophoresis include isoelectric focusing, capillary zone electrophoresis, and high-performance liquid chromatography.

References

Illustrations

Worked examples

Example 1 — a first encounter with Hemoglobin electrophoresis

Start with the simplest possible case. Write down what Hemoglobin electrophoresis claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hemoglobin electrophoresis before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hemoglobin electrophoresis ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hemoglobin electrophoresis

In research: Hemoglobin electrophoresis appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hemoglobin electrophoresis in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hemoglobin electrophoresis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Blood tests, so understanding it makes those chapters shorter.
In everyday life: Look for Hemoglobin electrophoresis outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hemoglobin electrophoresis in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hemoglobin electrophoresis means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hemoglobin electrophoresis out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hemoglobin electrophoresis in simple terms?

Why does Hemoglobin electrophoresis matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hemoglobin electrophoresis?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hemoglobin electrophoresis.