Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 94 peer-reviewed journal articles Updated
Nephrology

Atypical Hemolytic Uremic Syndrome (aHUS): A Guide for Patients and Families

At a Glance

Atypical Hemolytic Uremic Syndrome (aHUS) is a rare genetic disease that causes abnormal blood clots in small blood vessels. It is a diagnosis of exclusion treated primarily with C5 inhibitors like eculizumab and ravulizumab. Close monitoring is required to manage the risk of relapse.

Welcome to the aHUS Resource Guide. If you or a loved one has recently been diagnosed with atypical Hemolytic Uremic Syndrome (aHUS), you are likely feeling overwhelmed. This guide is designed to help you understand the diagnosis, the biology behind it, the treatments available, and what life looks like after the initial crisis.

Living with a rare disease means you often have to become an expert in your own condition. The information provided here is meant to empower you to have productive, informed discussions with your care team.

Please navigate through the sections below to learn more about each specific aspect of aHUS.

Sections in this Guide:

01

Validation & Orientation: Understanding an aHUS Diagnosis

Learn what an atypical Hemolytic Uremic Syndrome (aHUS) diagnosis means. Understand the TMA triad, the complement system, and how to navigate recovery.

02

Biology & Diagnosis: Differentiating aHUS from TTP and STEC-HUS

Learn how atypical hemolytic uremic syndrome (aHUS) is diagnosed. Understand why doctors must rule out TTP and STEC-HUS first, and what key tests mean.

03

The Root Cause: Genetics and Autoantibodies in aHUS

Learn about the root causes of atypical hemolytic uremic syndrome (aHUS). Understand complement system mutations, anti-CFH autoantibodies, and triggers.

04

Treatment Strategy: C5 Inhibitors and Standard of Care

Learn about the standard of care for atypical Hemolytic Uremic Syndrome (aHUS). Understand how C5 inhibitors like Soliris and Ultomiris work and their risks.

05

Long-Term Management: Monitoring, Relapse Risk, and Discontinuation

Learn about aHUS long-term management, safely stopping C5 inhibitor therapy, monitoring for relapse, and how genetics affect your risk of disease recurrence.

Common questions in this guide

What is atypical Hemolytic Uremic Syndrome (aHUS)?
Atypical Hemolytic Uremic Syndrome (aHUS) is a rare disease caused by genetic mutations and immune system glitches. These issues lead to abnormal blood clotting in small vessels, known as the TMA Triad.
How do doctors diagnose aHUS?
Because aHUS shares symptoms with other conditions, it is considered a diagnosis of exclusion. Your doctors must run specific tests to differentiate it and rule out similar diseases like TTP and STEC-HUS before confirming an aHUS diagnosis.
What are the standard treatments for aHUS?
The standard of care for aHUS involves targeted therapies called C5 inhibitors. Medications such as eculizumab and ravulizumab are life-saving treatments used to stop the abnormal clotting process and protect your organs.
What should I do if I suspect an aHUS relapse?
You should establish a primary point of contact with your care team for any sudden symptoms. It is highly recommended to always carry your specific medical records and recent lab results with you so emergency providers have the necessary information.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is the primary point of contact if I experience sudden symptoms or suspect a relapse?
  2. 2.Are there any specific medical records or lab results I should always carry with me?
  3. 3.Can you connect me with a social worker or patient advocacy group to help navigate insurance and emotional support?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

This guide is for informational purposes only and does not replace professional medical advice. Always consult your healthcare team regarding your atypical Hemolytic Uremic Syndrome diagnosis, genetic testing, and treatment plan.

Get notified when new evidence is published on Atypical hemolytic uremic syndrome.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.