Post-COVID-19 Functional Status scale
PCFS: a 0–4 grading of how much daily life is affected
The PCFS scale was proposed by Klok and colleagues in 2020 as a common yardstick for functional status after COVID-19. It gives you a single grade from 0 (no functional limitations) to 4 (severe limitations). It is widely used in long COVID research and rehabilitation, with versions in more than 25 languages.
Its strength is simplicity. It measures consequences for daily life rather than symptoms, so it works as a quick, repeatable tracking measure. Answer the four questions below to find your grade. It takes well under a minute.
Want more detail? The FUNCAP questionnaire profiles what 27 specific activities cost you, and the Bell scale gives a 0–100 functional rating. If your symptoms flare after activity, see the post-exertional malaise questionnaire.
1. Can you live alone without any assistance from another person?
For example: independently washing, dressing, eating, and using the toilet.
2. Are there duties or activities at home or at work that you are no longer able to perform yourself?
Things you did before the infection that you now cannot do at all.
3. Do you suffer from persistent symptoms, pain, depression, or anxiety related to the infection?
For example: fatigue, breathlessness, brain fog, loss of taste or smell, palpitations.
4. Do you need to avoid or reduce your usual duties or activities, or spread them over time?
You can still do everything, but you have to pace, cut back, or plan around symptoms.
Your PCFS grade
The five PCFS grades
No functional limitations
No symptoms and no limitations in everyday life related to the infection.
Negligible limitations
You can perform all usual duties and activities, although you still have persistent symptoms, pain, depression or anxiety.
Slight limitations
You occasionally need to avoid or reduce usual duties and activities, or spread them over time, due to symptoms. You can perform all activities without assistance.
Moderate limitations
You are not able to perform all usual duties and activities due to symptoms, but you can take care of yourself without assistance.
Severe limitations
You need assistance with activities of daily living: you are dependent on nursing care and/or assistance from another person due to symptoms.
Using your grade
The PCFS is most useful tracked over time: the authors suggest recording it at discharge or diagnosis, and again at intervals such as 4–8 weeks and 6 months. A grade that is not falling over months is a concrete, communicable signal to raise with your GP or a long COVID service.
Grades 2–3 generally indicate a level of limitation where rehabilitation support and pacing advice are appropriate; grade 4 indicates a need for care support. The scale is deliberately coarse, so a stable grade can still hide real change. Pairing it with a more detailed tool such as the FUNCAP or a symptom diary gives you both the headline and the detail.