The HUS medical abbreviation stands for hemolytic uremic syndrome, a condition in which red blood cells break apart, platelets fall, and the kidneys are injured, all at the same time. Each word in the name points to one part of that picture.
Families most often meet the term when a child becomes ill a few days after a bout of diarrhea, often bloody, caused by a toxin-making strain of E. coli. Adults can develop it too, and a less common form called atypical HUS is driven by problems in part of the immune system rather than an infection. This page walks through what the letters mean, how HUS is written up in hospital notes, and which look-alike conditions it is compared with.
At a glance
Stands for
Hemolytic uremic syndromeSpecialty
Pediatrics, nephrology, hematologyCore findings
Hemolytic anemia, low platelets, acute kidney injuryCommon trigger
Shiga toxin from certain E. coli strainsOther forms
Atypical HUS (aHUS), linked to complement problemsDo not confuse with
Where you see it
Hospital problem lists, kidney and blood lab notes
What the HUS medical abbreviation describes
Hemolytic uremic syndrome belongs to a group of disorders called thrombotic microangiopathies. In plain terms, tiny clots form inside the smallest blood vessels. Red cells squeezing past those clots get torn into fragments, platelets are used up in the clots, and the filters of the kidneys become blocked and damaged.
That gives the classic trio doctors look for: a low red cell count from destruction of cells (hemolytic anemia), a low platelet count (thrombocytopenia), and a fast fall in how well the kidneys filter (acute kidney injury). Among young children, HUS ranks high on the list of reasons for acute kidney injury. Some patients need dialysis for a while, and most children with the infection-related form recover kidney function, although follow-up is usually advised.
Breaking the name into its parts
| Word | Roots | Meaning here |
|---|---|---|
| Hemolytic | hem/o (blood) + lysis (breaking down) | Red blood cells are being destroyed |
| Uremic | ur/o (urine) + emia (blood condition) | Waste that the kidneys should clear builds up in the blood |
| Syndrome | Greek for running together | A group of findings that appear together |
Students who learn these roots can often decode the whole term without memorizing it. Uremia is a sign that the kidneys are not keeping up.
Typical and atypical forms
The most common form follows an infection with Shiga toxin producing E. coli, often the O157:H7 strain, picked up from undercooked ground beef, unpasteurized juice or milk, contaminated produce or contact with farm animals. Notes may call it STEC-HUS. The diarrhea usually comes first, and signs of HUS such as paleness, tiredness and making less urine tend to appear about a week later.
Atypical HUS, written aHUS, is not tied to that infection. It is usually related to overactivity of the complement system, a part of immune defense, and can run in families. Other triggers that may appear in a chart include certain medicines, pregnancy, some cancers and transplants. The form matters because treatment differs.
How HUS appears in charts and lab reports
Clinicians build the diagnosis from several lab results, and you will usually see them listed together near the abbreviation.
Pediatric admission note: "6 yo with 5 days of bloody stools, now pale, decreased UOP. Hgb 7.9, plt 38K, Cr 2.4, LDH high, schistocytes on smear. Stool STEC positive. Assessment: STEC-HUS." Here the low hemoglobin and fragments on the smear show hemolysis, the platelet count is low, and the creatinine shows kidney injury.
A CBC tracks red cells and platelets, while a BMP tracks creatinine and potassium. Urine output, often written UOP, is watched closely.
HUS compared with TTP and DIC
Three conditions that lower platelets and damage red cells are easy to mix up on a problem list.
| Abbreviation | Full name | What stands out |
|---|---|---|
| HUS | Hemolytic uremic syndrome | Kidney injury is prominent; often follows diarrhea in children |
| TTP | Thrombotic thrombocytopenic purpura | Very low ADAMTS13 enzyme activity; more often adults; brain symptoms common |
| DIC | Disseminated intravascular coagulation | Clotting tests are abnormal because clotting factors are used up |
HUS and TTP overlap a lot, which is why teams send specific tests before settling on one label.
What parents and patients may want to ask
- Is this the infection-related type or the atypical type?
- How will kidney function be checked after discharge, and for how long?
- Which blood and urine tests should we expect at follow-up visits?
- Are there steps to protect other family members if an E. coli infection was found?
Related blood and kidney shorthand is gathered in the condition abbreviation hub.
What you read here is background on HUS as a term. Questions about a specific child's or adult's illness, tests or recovery are best answered by the treating kidney or blood specialist.
Frequently asked questions
What does HUS stand for in medical terms?
HUS stands for hemolytic uremic syndrome. It describes the combination of red blood cell breakdown, a low platelet count and kidney injury.
Is HUS the same as an E. coli infection?
No. A toxin-making E. coli infection is the most common trigger, but most people with that infection do not develop HUS. HUS is a complication that some patients, especially young children, go on to have.
What is aHUS?
aHUS means atypical hemolytic uremic syndrome. It is not caused by the usual diarrheal infection and is most often linked to overactivity of the complement part of the immune system.
Is HUS the same as TTP?
They are related and look alike, since both cause tiny clots, low platelets and broken red cells. HUS tends to hit the kidneys hardest, while TTP is tied to a very low level of the ADAMTS13 enzyme and more often affects the brain.
Can kidneys recover after HUS?
Many children with the infection-related form regain kidney function, though some have lasting effects. Doctors usually arrange follow-up blood pressure, urine and kidney tests to keep watch.