ICU Nurse Job Description: Duties, Skills, Pay and the CCRN Certification

What an ICU nurse does

ICU stands for intensive care unit. A critical care nurse is a registered nurse (RN) who works in one, caring for patients with serious, complex illnesses or injuries that need close, continuous monitoring. The US Bureau of Labor Statistics (BLS) describes critical care nurses in exactly those terms in its registered nurses profile.

Patients may be on a ventilator, receiving medicines through several intravenous lines, recovering from major surgery or trauma, or fighting a severe infection. Many cannot speak for themselves, so the nurse often becomes the person who notices that something is wrong and speaks up for them.

Hospitals usually split intensive care into units by patient type. Names vary, but common ones are:

A small hospital may have one mixed ICU. A large one may have several specialized units. For where critical care sits among other nursing careers, see our list of nursing specialties.

Duties and responsibilities

BLS lists the general duties of registered nurses as assessing patients, recording histories and symptoms, giving medicines and treatments, setting up care plans, consulting with physicians, operating and monitoring medical equipment, helping with diagnostic tests, and teaching patients and families. In the ICU, each of those is done more often and with less margin for error. Typical duties include:

• Frequent assessment. Checking heart rhythm, breathing, blood pressure, oxygen levels, neurological status and urine output, and noticing small changes early.
• Monitoring equipment. Watching bedside monitors, ventilators, infusion pumps and, in some units, devices such as dialysis machines or heart-support devices.
• Medicines and infusions. Giving and adjusting powerful drugs, often by continuous drip, according to orders and unit protocols, and double-checking doses with a colleague where policy requires it.
• Lines, tubes and wounds. Caring for breathing tubes, central lines, drains, catheters and surgical sites, and working to prevent infection.
• Responding to emergencies. Taking part in resuscitation and rapid response, alongside doctors, respiratory therapists and pharmacists.
• Basic care. Turning, bathing, mouth care, feeding and keeping patients comfortable, which prevents pressure injuries and other complications.
• Documentation. Recording observations, interventions and changes accurately in the electronic record.
• Communication. Updating physicians on rounds, handing off to the next shift, and explaining what is happening to worried families in plain language.
• End-of-life support. Helping patients and families through difficult decisions and, sometimes, through a death.

What a nurse may do on their own differs by state law, hospital policy and the doctor’s orders. Check the employer’s job posting and your state board of nursing for specifics.

A sample shift

No two shifts are alike. The timeline below is our illustration of a 12-hour day shift on a mixed medical-surgical ICU, not a record of any real unit. Times and tasks are approximate.

Breaks are meant to happen, but a crisis can push them back. Ask employers how coverage works so a break does not depend on luck.

Skills employers look for

Most of these are learned on the job. Employers hiring new graduates usually expect to train them through a structured orientation, often called a residency or preceptorship, and many also teach critical care courses of their own.

Education and licensing

To work as an RN you need to graduate from an approved nursing program and pass the licensing exam, then hold a license from the state where you work. BLS notes that the typical entry-level education for registered nurses is a bachelor’s degree, with associate degree and diploma routes also available, and that employers, particularly hospitals, may require a bachelor’s degree. Requirements such as background checks vary by state, and each state board of nursing sets the details.

If you have an associate degree or diploma and a license, an RN-to-BSN program can add the bachelor’s degree while you keep working. See our guide to RN-to-BSN online programs.

Most hospitals also require basic life support (BLS) certification, and many ICUs require advanced cardiac life support (ACLS) within a set time after hire. Some require extra courses depending on the unit, such as pediatric advanced life support for a PICU. The employer’s posting will list them.

The CCRN certification

The best-known credential for ICU nurses is the CCRN, offered by the American Association of Critical-Care Nurses (AACN) in adult, pediatric and neonatal versions. It is optional, but many nurses earn it to show specialty knowledge, and some employers pay a bonus or cover the fee. Do not assume yours will; ask.

For the adult exam through the direct-care pathway, AACN’s CCRN page states these requirements:

According to AACN’s exam handbook, the adult exam has 150 multiple-choice questions, of which 125 are scored, with three hours to finish. About 80% of the content covers clinical judgment (cardiovascular, respiratory, and other body systems) and 20% covers professional caring and ethical practice. The certification lasts three years, and it can be renewed with continuing education points or by passing the exam again.

AACN updates its exams and eligibility rules from time to time, so confirm the current fee and requirements on its website before you apply.

Pay and job outlook

Here is what the federal numbers cover. BLS reports data for registered nurses as a whole, not for ICU nurses specifically:

• Median pay: $97,550 per year ($46.90 per hour) in May 2025.
• Employment: about 3.47 million RN jobs in 2025.
• Outlook: a projected 6% growth from 2025 to 2035, faster than the 3% average for all occupations, with about 180,800 openings each year on average, many from nurses who retire or change jobs.
• Where they work: hospitals employ about 59% of RNs.

ICU pay is not broken out in these figures. What we can say is that actual pay depends on your state and city, your employer, your experience, shift differentials for nights and weekends, overtime and any certification bonus. Salary websites publish ICU-specific averages, but their methods differ and the numbers vary a lot between them, so treat any single figure with caution. A better method is to read pay ranges in current job postings in your area. Some states require employers to include them.

For the bigger workforce picture, read our guide to the qualified nurses shortage.

Staffing ratios

How many patients a nurse looks after matters more in the ICU than almost anywhere else. In many ICUs a nurse cares for one or two patients at a time, depending on how sick they are, but there is no single national rule.

California is the best-known state with a legal minimum. Its hospital regulations on intensive care service staff (California Code of Regulations, Title 22, section 70495) say the nurse-to-patient ratio in an ICU shall be 1:2 or fewer at all times. Other states handle staffing by law, by hospital committee or by union contract, and the rules differ. Ask about typical ratios, and what happens when a unit is short, during your interview.

The hard parts of the job

A fair job description includes the difficult side:

• Emotional load. Serious illness, trauma and death are routine. Moral distress and burnout are real risks, and good units have debriefing, peer support and counseling.
• Shift work. As BLS notes, hospital nurses often work shifts to provide round-the-clock coverage, including nights, weekends and holidays, and they may be on call.
• Physical demands. Long stretches on your feet and lifting or turning patients. Learn the unit’s lift equipment and use it.
• High stakes. Mistakes can seriously harm patients. Strong teams use checklists, double-checks and a culture where it is safe to speak up.
• Constant learning. Treatments, devices and guidelines change, so expect ongoing training.

None of this means the job is not worth doing. Many ICU nurses describe it as the most rewarding work they have done. It does mean you should look closely at staffing, support and culture when choosing a unit.

How to get into critical care

1. Earn your RN license. Complete an approved program (associate, bachelor’s or diploma), pass the licensing exam, and apply for a license in the state where you will work.
2. Consider a bachelor’s degree. Some hospitals prefer or require one, and some will hire an associate-degree nurse on condition that they finish a BSN within a set number of years.
3. Apply to new-graduate residencies. Many hospitals run structured programs that place new nurses directly in the ICU. These are competitive, so apply early and apply widely.
4. Or build experience first. Some units prefer a year on a medical-surgical or step-down unit, which also builds skills in assessment and time management.
5. Get your life support certifications. BLS first, then ACLS when the employer asks for it.
6. Learn the unit. Work with your preceptor, ask questions and take the hospital’s critical care course if it offers one.
7. Earn the CCRN. Once you meet the hours, certification is a clear way to show your knowledge.

Later paths include charge nurse, educator, clinical nurse specialist or nurse practitioner, which require further education. Our nursing specialties guide compares them.

Sample job description

This is our own template, written from the duties above, not taken from any real employer. Hiring managers can adapt it, and applicants can use it to see how a posting is structured.

Frequently asked questions

What does an ICU nurse do?

An ICU nurse monitors and treats critically ill patients, gives medicines and infusions, operates equipment such as ventilators, responds to emergencies and keeps patients and families informed.

Is ICU nursing a good career?

It suits people who like complex medicine, quick thinking and close teamwork. It is also stressful and demanding. Talk to nurses on the unit you are considering before you decide.

What is the difference between an ICU nurse and a critical care nurse?

They are usually the same job. “Critical care nurse” is the general term, and “ICU nurse” names the place.

Do you need a bachelor’s degree to be an ICU nurse?

Not always. BLS says a bachelor’s degree is the typical entry-level education for RNs, but associate degree and diploma routes also exist. Some hospitals require a bachelor’s degree or require you to complete one after hire.

Can a new graduate work in the ICU?

Yes, in many hospitals. Some run new-graduate residencies for the ICU, while others prefer experience on another unit first. Policies vary, so ask.

Do I need the CCRN to work in an ICU?

No. It is optional, and you need clinical hours before you can sit the exam. Many employers prefer it and some pay for it.

How many hours do you need for the adult CCRN?

AACN’s two-year option asks for 1,750 hours of direct care to acutely or critically ill adults, with 875 in the most recent year. The five-year option asks for at least 2,000 hours, with 144 in the most recent year.

How much do ICU nurses make?

BLS does not report ICU pay separately. It gives a median of $97,550 for all registered nurses in May 2025. Your pay depends on location, employer, experience, shift and certifications, so check current job postings near you.

How many patients does an ICU nurse care for?

Usually one or two, depending on how sick they are and on the hospital and state. California’s regulation sets 1:2 or fewer in the ICU.