Dad said yes to a walker. Good. Do not celebrate by ordering the first aluminum contraption that appears on a screen.

Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.

A walker has to fit two things at once: Dad and the route he actually walks. Miss either one and the walker will end up folded behind a chair while Dad goes back to the furniture.

The National Library of Medicine says the choice of mobility aid and its fit may require help from a health care provider or physical therapist. Its walker instructions also place the handles around hip level with the elbows slightly bent. That is the starting point, not permission to guess at a device from Dad's height alone. The CDC home safety checklist separately calls for clear floors, controlled cords, secure rugs, and usable lighting. Those sources are identified on the site's Sources page.

First, find out what Dad agreed to

Ask one clean question: "Did you agree to use a walker, or did you agree to let someone show you which walker works?"

Those are different deals. He may accept a standard walker, reject wheels, want a seat, or refuse anything that cannot fold into his car. A device selected without that conversation is not fitted. It is delivered.

If a clinician or therapist recommended the walker, get the exact description. Ask whether it should have no wheels, front wheels, or four wheels. Ask whether Dad is supposed to put weight through it, whether brakes or a seat are appropriate, and whether there are movements he should not attempt. Do not substitute a salesperson's inventory for those answers.

Measure Dad with the shoes and hands he actually uses

Have the fit checked while Dad is wearing his usual walking shoes. Thick house shoes, bare feet, and outdoor shoes can place him at different heights. If he changes footwear through the day, tell the person fitting the walker.

Check the grip, not just the frame. Can Dad close his hands around both handles? Can he operate any brakes without shifting his hands into an awkward position? Does arthritis, weakness, numbness, or a stiff finger change what he can manage? A brake lever that works beautifully for the demonstrator has proved nothing.

Stand the walker on a level floor and look at Dad from the side. He should not have to reach far forward, hike his shoulders, or bend deeply to find the handles. MedlinePlus advises a height that leaves the elbows slightly bent. Have a physical therapist or other qualified clinician confirm the adjustment and teach the specific sequence Dad needs. This is especially important if one leg is weaker, weight bearing is restricted, or Dad has been told to use the device after an injury or procedure.

Record the final adjustment. Count exposed adjustment holes or place a small piece of contrasting tape beside the correct setting. Folding, transport, or a curious relative can change it.

Measure the house at its meanest points

Measure the walker's widest fixed point. Do not use the distance between the handgrips. Wheels, brake hardware, bolts, and folded accessories may stick out farther.

Then measure the clear opening Dad gets, not the size printed on the door. Open each door as far as furniture and walls allow. Measure between the parts that actually limit passage. Include hinges, doorstops, trim, raised thresholds, bath mats, and anything stored behind the door.

Start with the route Dad cannot avoid:

Chair to toilet. Bed to toilet. Chair to kitchen sink. Usual entrance to car. Any route to the telephone or other way he calls for help.

At each route, check four separate jobs: straight passage, turning, opening the door, and approaching the destination. A walker may pass through a bathroom doorway and still leave no room to turn toward the toilet. It may reach the bed and block the place where Dad needs to stand before sitting.

Use painter's tape to mark the walker's width on a tight floor area if Dad is not ready to test it there. Tape is not a substitute for a supervised trial, but it exposes optimistic measuring.

Watch the doors

A door is a small machine built to steal one hand.

Check whether each important door pushes away from Dad or pulls toward him. A pull door may require him to back up while controlling both the door and walker. A spring closer may push the door into the frame before he clears it. A round knob may demand grip and rotation while the other hand manages the device.

Do not teach a new door maneuver from an article. Ask the therapist fitting the walker to watch Dad open the actual difficult door. If that cannot happen, record a short video of the doorway and measure the clear opening, threshold, swing direction, and landing space. Bring that evidence to the fitting.

Do not assume a walker belongs on stairs. MedlinePlus cautions against using one on stairs or escalators without training from a physical therapist. If Dad's necessary route includes steps, name that problem before the walker comes home. The answer may involve another entrance, another device kept on the other level, hands-on help, or a change to the route.

Run the carrying test

Ask Dad to show you how he plans to carry his phone, glasses, drink, mail, and plate. If the answer is "in my hand," the walker has already lost one of its grips.

MedlinePlus suggests a small bag or basket so both hands can remain on the walker. Fit any accessory before declaring the job done. Load it with the ordinary items Dad carries and check whether it blocks his legs, catches a doorframe, changes the folded size, interferes with brakes, or makes the walker tip when parked.

A cup holder does not solve the dinner route. If Dad routinely carries hot food or an open drink, decide where he can sit to eat and how the item gets there without occupying his hands.

Test every parking place

The walker needs a reachable parking place beside the bed, favorite chair, toilet, and entrance. "Nearby" is not enough. Dad must be able to reach it before standing, without leaning over an end table or taking three unsupported steps.

Check whether the walker stays open and stable where he leaves it. If it folds for storage, ask who unfolds it and when. A perfectly stored walker is often unavailable at the exact moment it is needed.

Also check the car. Measure the folded walker and the trunk or passenger space. Have Dad show how he expects to load it. If loading requires him to stand unsupported while lifting and twisting, the transportation plan is unfinished.

Know where your authority stops

If Dad understands the choice and can make it, the walker remains his decision. Agreement to discuss one does not authorize you to rearrange the house, remove property, or make him use it.

Use the failed route as the side door into the conversation. "The frame clears the hall, but it cannot turn beside the toilet. Which do you want to change, the setup or the device?" That gives him a real choice instead of another lecture about accepting help.

If Dad cannot explain what the walker is for, repeatedly forgets the agreed restriction, or has had a sudden change in thinking or movement, stop treating this as a measuring problem. Contact the clinician involved in his care. Call emergency services when there is an immediate threat to life or safety.

The next move

Tonight, measure the walker's widest point and the clear opening at Dad's bathroom door. Then place the walker beside his usual chair and ask him to show you, without coaching, how he would stand, reach it, get through that door, turn toward the toilet, and park it again. Write down the first place the route fails. That is the job you take to the fitter, therapist, or house next.