A certified nursing assistant (CNA) spends most of the day helping patients with basic physical needs: bathing, dressing, eating, using the toilet, and moving safely from place to place. These tasks, known as activities of daily living, make up the core of the job. But the role also includes clinical measurements, detailed record-keeping, and serving as the main point of contact between patients and nurses. Here’s what that looks like in practice.
Hands-On Personal Care
The bulk of a CNA’s shift revolves around helping patients do things they can’t do independently. That includes giving baths or bed baths, helping people get dressed, assisting with toileting or changing incontinence products, brushing teeth, and combing hair. In long-term care facilities, a CNA may be assigned to a group of 8 to 12 residents and cycle through these tasks for each person, often starting first thing in the morning.
Feeding is another major responsibility. Some patients need full assistance at mealtimes, while others just need someone to set up their tray, open containers, or monitor for choking. CNAs also track how much a patient eats and drinks, because changes in appetite or fluid intake can signal a developing problem that nurses need to know about.
Moving and Repositioning Patients
CNAs spend a significant part of each shift physically moving people. That means helping patients stand up from a bed or chair, transferring them into wheelchairs, walking alongside them in hallways, and repositioning bedridden patients every two hours to prevent pressure injuries.
The tools vary depending on how much a patient can do on their own. A transfer belt wraps around the patient’s waist and gives the CNA a secure grip during standing transfers. Slide boards bridge the gap between a bed and a wheelchair for patients who can’t bear weight on their legs but have decent upper-body strength. For patients who can’t assist with movement at all, a mechanical hoist lifts them using a fitted sling. Knowing which device to use, and using it correctly, is one of the most physically demanding and safety-critical parts of the job.
Taking and Recording Vital Signs
CNAs are responsible for measuring five key vital signs: temperature, pulse, respiratory rate, blood pressure, and oxygen saturation. A typical round involves checking each patient with a thermometer, a blood pressure cuff, and a pulse oximeter (a small clip placed on the fingertip that reads blood oxygen levels).
Normal ranges give CNAs a baseline for spotting trouble. A resting adult heart rate falls between 60 and 100 beats per minute. Normal breathing is 12 to 20 breaths per minute. Blood pressure is recorded as two numbers, like 120/80, representing the force of blood during and between heartbeats. Oxygen saturation should generally land between 94% and 98%, though patients with chronic lung conditions may normally sit lower, around 88% to 92%. When any reading falls outside expected range, the CNA reports it to the supervising nurse immediately.
Documenting Everything
Every task a CNA performs gets documented, usually on paper flow sheets or in an electronic health record. This includes vital sign readings, how much a patient ate and drank, bowel and bladder output, skin condition, mood changes, and any complaints the patient mentioned. Accurate charting matters because nurses and doctors rely on these records to make treatment decisions.
Good documentation is specific and timely. Writing “patient ate well” is too vague. Recording that a patient ate 75% of their lunch and drank 240 mL of water gives the care team something useful. CNAs are trained to chart care at the time they provide it rather than trying to remember details at the end of a shift. They also record safety measures like whether bed rails are up and whether a fall-risk patient’s call light is within reach.
Infection Control Practices
CNAs wash or sanitize their hands dozens of times per shift. Hand hygiene before and after every patient interaction is the single most important infection control measure in healthcare, and CNAs, who have more physical contact with patients than almost anyone else on the floor, follow this rigorously. Beyond handwashing, CNAs wear gloves, gowns, and masks whenever there’s a chance of exposure to bodily fluids or infectious material. They also handle soiled linens carefully, disinfect patient care equipment between uses, and dispose of contaminated materials in designated biohazard containers.
What CNAs Cannot Do
CNAs work under the direct supervision of registered nurses and have a clearly defined scope of practice. They do not administer medications, start IV lines, change wound dressings, or make clinical judgments about a patient’s condition. Those responsibilities fall to licensed practical nurses (LPNs) or registered nurses (RNs). A CNA who notices something concerning, like a wound that looks infected or a patient who seems confused, reports the observation to the nurse rather than acting on it independently. This reporting role is critical. CNAs often spend more one-on-one time with patients than any other staff member, which makes them the earliest line of detection for changes in condition.
How the Shift Shapes the Work
A CNA’s day looks different depending on which shift they work. Day shifts tend to be the busiest. Morning care starts early: waking patients, helping them wash and dress, serving breakfast, and assisting with toileting. More doctors and specialists are on-site during the day, which means more scheduled tests, therapy appointments, and procedures that require patients to be moved and prepared. There’s a fast, constant rhythm to it.
Evening shifts center on dinner, getting patients ready for bed, and completing end-of-day documentation. Night shifts are generally quieter but still involve regular rounds to reposition patients, respond to call lights, check vital signs, and change soiled linens. The slower pace at night can give CNAs more time to review charts and build rapport with patients who have trouble sleeping. Regardless of the shift, the physical demands are consistent. CNAs are on their feet for nearly the entire time.
Training and Certification
Federal law requires a minimum of 75 hours of training to become a CNA, with at least 16 of those hours spent in supervised hands-on practice under the direction of a registered nurse or LPN. Many states set their own requirements above this federal floor, with some requiring 120 hours or more. After completing a state-approved program, candidates must pass a competency exam that includes both a written test and a skills demonstration. The entire process, from enrollment to certification, typically takes four to twelve weeks depending on the program format.
The Bureau of Labor Statistics classifies CNA work alongside nursing assistants and orderlies. The field is large and demand remains steady, driven primarily by the aging population and the ongoing need for direct care workers in nursing homes, hospitals, and assisted living facilities.