What Does a CNA Do? Job Duties, Responsibilities & Day in the Life

What Does a CNA Do?

A Certified Nursing Assistant (CNA) provides direct, hands-on patient care under the supervision of a Registered Nurse (RN) or Licensed Practical Nurse (LPN). CNA job duties center on helping patients with the activities of daily living (ADLs) — the fundamental tasks that many patients cannot perform independently due to illness, injury, disability, or age. Planning to advance to RN? Our free NCLEX practice test 2026 covers all Next Generation NCLEX formats including case studies and matrix questions.

The roles of a CNA are both physically demanding and emotionally rewarding. Unlike nurses who focus primarily on assessments, medications, and care planning, CNAs spend the most direct time with patients — bathing, feeding, repositioning, and talking with them throughout every shift. This constant presence makes CNAs critical to patient safety and comfort.

CNA responsibilities include monitoring patient conditions and reporting changes to the supervising nurse, maintaining infection control standards, assisting with ambulation, and documenting care provided. In many facilities, CNAs are the first to notice subtle changes in a patient's condition — a skill that requires sharp observation and clear communication. Mastering core CNA skills — from vitals to ADL assistance — is essential for any new nursing assistant.

For CNAs interested in understanding CNA salary differences across settings, pay varies widely — from $13/hr in entry-level roles to $25/hr in hospital units. CNA duties also vary significantly by setting. A CNA working in a hospital trauma unit has a very different day than one working in a home health role or an assisted living facility. Understanding these distinctions helps you choose the right work environment for your skills and career goals.

Core CNA Job Duties

Regardless of where a CNA works, certain duties appear in virtually every job description. Here is a breakdown of the most common CNA responsibilities you will encounter on the job:

Taking and Recording Vital Signs

CNAs measure and document blood pressure, heart rate, respiratory rate, temperature, and oxygen saturation (SpO2). Accurate vital sign documentation is essential — deviations from baseline values can indicate early signs of deterioration and must be reported to the charge nurse immediately. CNA training programs spend significant time on proper technique for manual blood pressure readings and pulse oximetry interpretation.

Understanding the patient's CNA POC (Plan of Care) is essential — CNAs carry out the documented care plan every shift. Assisting with Activities of Daily Living (ADLs)

ADLs include bathing, grooming, oral hygiene, dressing, toileting, and eating. CNAs assist patients who cannot complete these tasks independently while always preserving patient dignity and respecting personal preferences. Assisting with ADLs is typically the largest portion of any CNA's daily workload and is central to the CNA job description.

Patient Positioning and Mobility

Repositioning immobile patients every two hours prevents pressure ulcers (bedsores), which can develop rapidly in at-risk populations. CNAs assist with transfers — moving patients from bed to wheelchair, wheelchair to toilet, and so on — using proper body mechanics and mechanical lifts to protect both the patient and the CNA from injury.

Communication and Reporting

Strong communication skills are non-negotiable in CNA work. CNAs relay observations to nurses, explain care procedures to patients in plain language, and coordinate with other team members during shift handoffs. What CNAs do in these moments of communication directly affects the quality and continuity of care.

Documentation

Accurate charting is a legal and clinical requirement. CNAs document every task completed — care provided, vital signs recorded, intake and output measurements, and any patient complaints or changes in condition. Many facilities now use electronic health record (EHR) systems, so basic computer literacy is part of the modern CNA job description.

Infection Control

Hand hygiene, proper use of personal protective equipment (PPE), and correct handling of soiled linens are critical infection control duties for CNAs. In long-term care and hospital settings, preventing the spread of pathogens like C. difficile, MRSA, and influenza is a daily priority. CNAs learn standard precautions and transmission-based precautions during their certification training.

What Does a CNA Do in a Hospital?

Hospital CNA jobs involve in one of the most demanding and well-compensated environments in CNA careers. What does a CNA do in a hospital differs from long-term care in both pace and clinical intensity.

In acute care hospital settings, CNA duties include:

• Post-surgical patient monitoring — tracking vital signs and alerting nurses to complications after procedures
• Rapid patient turnover — hospital stays are shorter, meaning CNAs help admit and discharge more patients per shift
• Assisting with procedures — setting up equipment, holding patients still during minor procedures, and collecting specimens
• IV and catheter care assistance — CNAs do not insert IVs or catheters but assist with repositioning, securing, and monitoring patients with these devices
• Emergency response support — in some hospitals, CNAs are trained as part of the rapid response team, performing CPR and preparing the patient room during emergencies

Hospital CNA positions typically require more advanced training and faster-paced decision-making than nursing home roles. CNAs who prefer a one-on-one environment may consider home health CNA roles instead. CNAs interested in travel CNA jobs can earn even more — often $25-35/hr with housing stipends. They also offer higher pay — averaging around $19.80/hr nationally — plus shift differentials for nights. CNAs seeking flexible schedules may explore CNA agency jobs which offer premium pay rates. Hospital CNAs also earn shift differentials for nights and weekends. If you want to maximize your hospital CNA exam preparation, start with a cna test that covers clinical scenarios common in acute care settings.

Hospital CNAs often work on specialized units including medical-surgical floors, intensive care units (ICUs), labor and delivery, orthopedics, and oncology. Each unit has specific protocols that CNAs learn during orientation.