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Ultra-rare disease

Ultra-rare disease is a biology 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 Ultra-rare disease rather than just read about it. In short: An ultra-rare disease is a disease that affects an extremely small percentage of the population. In some parts of the world, an ultra-orphan disease is a rare disease whose rarity means there is a lack of a market large enough to have support and resources for discovering treatments for it.

Key takeaways

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

Reference excerpt

An ultra-rare disease is a disease that affects an extremely small percentage of the population. In some parts of the world, an ultra-orphan disease is a rare disease whose rarity means there is a lack of a market large enough to have support and resources for discovering treatments for it. Distinct countries define and provide special economic incentives for companies developing drugs that treat ultra-rare diseases. In 2018, the Scottish Government introduced a new definition of 'ultra-orphan medicines' that can treat very rare conditions affecting fewer than 1 in 50,000 people – around 100 people or less in Scotland. The new definition also allows the Scottish Medicines Consortium (SMC) the ability to treat some medicines for rare orphan diseases as ultra-orphan medicines. The changes mean if the medicine meets the new definition of an ultra-orphan medicine and the SMC consider it clinically effective, then it will be made available on the NHS for at least three years while information on its effectiveness is gathered. The SMC will then review the evidence and may make a final decision on its routine use in NHS Scotland. Scholars have recently (2022–2023) proposed adoption of a similar ultra-orphan designation in the US with a prevalence threshold of 1 in 50,000 patients or based on an arbitrary threshold of 10,000 affected US citizens.

See also Orphan drug

References

Worked examples

Example 1 — a first encounter with Ultra-rare disease

Start with the simplest possible case. Write down what Ultra-rare disease claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Ultra-rare disease 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 Ultra-rare disease 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 Ultra-rare disease

In research
Ultra-rare disease appears in biology 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 Ultra-rare disease 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
Ultra-rare disease is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rare diseases, so understanding it makes those chapters shorter.
In everyday life
Look for Ultra-rare disease 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 Ultra-rare disease in 20 minutes

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

Frequently asked questions

What is Ultra-rare disease in simple terms?

An ultra-rare disease is a disease that affects an extremely small percentage of the population. In some parts of the world, an ultra-orphan disease is a rare disease whose rarity means there is a lack of a market large enough to have support and resources for discovering treatments for it.

Why does Ultra-rare disease matter?

Because it connects several biology 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 Ultra-rare disease?

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 Ultra-rare disease.

Tags

  • Rare diseases

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