science

National Kidney Registry

National Kidney Registry 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 National Kidney Registry rather than just read about it. In short: The National Kidney Registry (NKR) is a national registry in the United States listing living kidney donors and recipients in need of a kidney transplant. NKR facilitates hundreds of "Kidney Paired Donation" (KPD) or "Paired Exchange" transplants annually.

Key takeaways

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

Reference excerpt

The National Kidney Registry (NKR) is a national registry in the United States listing living kidney donors and recipients in need of a kidney transplant. NKR facilitates hundreds of "Kidney Paired Donation" (KPD) or "Paired Exchange" transplants annually. More than one-third of potential living kidney donors who want to donate their kidney to a friend or family member cannot because of blood type or antibody incompatibility. Historically, these donors would be turned away and the patient would lose the opportunity to receive a life-saving kidney transplant. KPD overcomes donor-recipient incompatibility by swapping kidneys between multiple donor-recipient pairs, and connecting them in longer chains, as well as taking an altruistic non-directed donor, and starting chains of kidney transplants. What the NKR does is consolidate the incompatible pairs of donors and recipients from transplant centers all over the United States, into a single registry, and facilitate the transplant process.

History The NKR was founded in 2007 by the Hil family, after their youngest daughter lost her kidney function at age ten. Both parents were ruled out from donating to their daughter because they were biologically incompatible. After many unsuccessful attempts to find a compatible donor through all of the kidney paired exchange programs in the United States, a compatible donor was found. After this transplant ordeal, the Hil family founded the National Kidney Registry to eliminate the problem of incompatible donors, by building a national kidney paired donation (KPD) program. The NKR organized its first swap on Valentine's Day in 2008 at Cornell Medical Center in New York City. This first swap was a 3-deep chain that ended with a bridge donor who donated two months later, extending the chain to 5-deep. The NKR's second swap started with the shipment of a kidney from Cornell to UCLA School of Medicine. This was the first time a living donor kidney was shipped on a commercial airplane. This second chain crossed the country three times, facilitating eight total transplants at UCLA, Cornell, Stanford University School of Medicine, and California Pacific Medical Center. Based on these early experiences, many safeguards were implemented to reduce the risk of broken chains, which dropped the frequency of broken chains from 33% in 2008 to 2% in 2015. In 2012, the NKR broke the world record for the largest kidney swap by organizing a 30-deep chain involving 60 donors and recipients. This chain was started by Rick Ruzzamenti, a 44-year-old from Riverside, California. The swap took four months to complete and involved 17 different transplant centers across 11 states. Three years later, on March 26, the next record breaking chain was set into motion by Kathy Hart, a 48-year-old attorney from Minneapolis. This swap took two months to complete and involved 26 different transplant centers. The NKR has facilitated 10,752 kidney transplants, as of June 24th, 2025. The NKR has grown its network of transplant centers to 102 centers across 35 states and the District of Columbia.

Key Innovations The rapid growth of KPD transplants in the United States has been driven by the following key NKR innovations.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with National Kidney Registry

Start with the simplest possible case. Write down what National Kidney Registry 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 National Kidney Registry 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 National Kidney Registry 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 National Kidney Registry

In research: National Kidney Registry 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 National Kidney Registry 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: National Kidney Registry is common in secondary-school and first-year university syllabi. It links to neighbouring topics Kidney organizations, Transplant organizations, so understanding it makes those chapters shorter.
In everyday life: Look for National Kidney Registry 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 National Kidney Registry in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what National Kidney Registry 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 National Kidney Registry out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is National Kidney Registry in simple terms?

Why does National Kidney Registry 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 National Kidney Registry?

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 National Kidney Registry.