PLOF stands for “prior level of function” and refers to how well a patient could perform everyday activities before an injury, illness, or hospitalization. Physical therapists use PLOF as a baseline to measure how much function a patient has lost and to set realistic recovery goals. It’s one of the first things a therapist documents when evaluating a new patient.
Why PLOF Matters in Rehabilitation
When a physical therapist meets you for the first time, they need to understand what “normal” looked like for you before your health changed. Someone who was running three miles a day before a knee replacement has a very different recovery target than someone who was already using a walker. PLOF captures that difference. Without it, a therapist has no way to know whether their treatment plan is aiming too high, too low, or in the wrong direction entirely.
PLOF also plays a major role in whether insurance covers your therapy. Medicare and other payers want documentation showing that skilled therapy services are necessary and that the treatment plan is working toward restoring you to a meaningful level of function. Your prior level of function is the reference point for that entire argument. If a therapist can’t clearly document what you were doing before, it becomes harder to justify the care you need.
What PLOF Actually Covers
PLOF isn’t a single measurement. It’s a picture of your daily life across several categories, generally split into basic and instrumental activities of daily living.
Basic activities of daily living are the physical essentials: bathing, dressing, eating, using the toilet, and moving from one place to another (transfers from bed to chair, for example). These tasks relate directly to your body’s basic needs and physical survival.
Instrumental activities of daily living require more complex thinking and organization. These include cooking, managing money, doing laundry, shopping, using transportation, and managing medications. You need to be able to navigate your home and spaces outside it to perform these tasks independently.
Beyond these categories, a physical therapist will typically document your mobility in detail: how far you could walk, whether you used an assistive device like a cane or walker, whether you could climb stairs, and how you got around your community. They’ll also note your living situation (alone, with a spouse, in an assisted living facility), your work status, and any recreational activities that mattered to you.
How Therapists Gather PLOF Information
The most straightforward source is you. Your therapist will ask specific questions during your initial evaluation: “Were you walking independently before this happened?” “Could you get in and out of the shower on your own?” “Were you driving?” The answers paint a detailed picture of your functional baseline.
But patients aren’t always able to provide this information themselves. After a stroke, a traumatic brain injury, or during a period of confusion, a patient may not remember or accurately describe their prior abilities. In these cases, therapists turn to family members and caregivers, who are often the best source of information about what daily life actually looked like. Previous medical records and prior hospital admissions can also fill in gaps, especially for patients with progressive conditions like dementia where function has been declining over time.
Accuracy matters here. Patients sometimes overestimate or underestimate what they were doing before. A family member might report that their parent “was doing fine at home” when in reality they were falling regularly or had stopped cooking months ago. Experienced therapists ask targeted, specific questions rather than general ones to get a clearer picture.
PLOF vs. CLOF
You may also see the term CLOF, which stands for “current level of function.” While PLOF captures what you could do before, CLOF describes what you can do right now, typically assessed on the first day of therapy or hospital admission. The gap between the two tells the clinical story: how much function was lost and how much needs to be recovered.
Research from Kaiser Permanente found that the ratio between CLOF and PLOF, measured on the first day of hospitalization, significantly predicted whether patients would be discharged home or to a skilled nursing facility. In other words, how you’re functioning now compared to how you were functioning before is one of the strongest indicators of where your recovery is headed. A large gap between PLOF and CLOF generally signals a longer, more intensive rehabilitation process.
How PLOF Shapes Your Treatment Plan
Your therapist uses PLOF to set goals that are specific, measurable, and meaningful to your life. Rather than a vague goal like “improve walking,” a PLOF-informed goal might read: “Patient will walk 500 feet with a rolling walker independently, consistent with prior level of function.” The baseline gives the goal its specificity.
PLOF also helps therapists and patients have honest conversations about expectations. If you were already limited in your mobility before surgery, returning to that prior level may be the realistic target rather than achieving a level of function you didn’t have before. On the other hand, for younger, more active patients, PLOF sets the bar higher and justifies more aggressive rehabilitation.
Throughout your course of therapy, your therapist will reassess your current function and compare it against your PLOF to track progress. This ongoing comparison determines when you’ve met your goals, when the plan needs adjusting, and when it’s appropriate to discharge you from therapy. It’s the thread that runs through every stage of your rehabilitation, from that first evaluation to your final visit.