In brief
- GMFCS stands for the Gross Motor Function Classification System, a five-level scale used to describe the motor abilities of children with cerebral palsy.
- It was developed by researchers at McMaster University and CanChild and first published in 1997. It was expanded and revised in 2007.
- The scale focuses on what a child typically does in their daily life (at home, at school, and in the community), not what they can do at their best in a clinic.
- Level I describes a child who walks without limitations. Level V describes a child who is transported in a manual wheelchair and has severe limitations in head and trunk control.
- Understanding your child's GMFCS level helps you interpret research, set realistic goals, and ask better questions of any therapist or clinic.
If you have read the cerebral palsy pages on this site, you have seen references to GMFCS levels I through V. That shorthand is used throughout CP research and clinical practice, but it is rarely explained to parents. This post explains what the GMFCS is, what each level means, and why it matters for your child's therapy decisions.
What is the GMFCS?
The Gross Motor Function Classification System, or GMFCS, is a standardized five-level system for classifying the gross motor function of children with cerebral palsy. It was developed by a team of researchers led by Robert Palisano and Peter Rosenbaum, is published by CanChild at McMaster University, and first appeared in 1997 in Developmental Medicine and Child Neurology. An expanded and revised version (GMFCS-E&R) was published in 2007.
The GMFCS does not measure how well a child moves on a continuous scale. Instead it assigns the child to one of five discrete levels based on their self-initiated movement in everyday settings. The levels apply to specific age bands (under 2 years, 2 to 4, 4 to 6, 6 to 12, and 12 to 18) because a child's abilities and the way they are assessed change as they grow.
How it differs from an assessment
The GMFCS is not the same thing as the GMFM-88 (Gross Motor Function Measure), which is a separate assessment tool that appears on the same site. The GMFM-88 measures specific motor skills in a standardized way and produces a score that can change over time. The GMFCS classifies a child into a level, and CanChild, which publishes the system, reports that levels are quite stable after 2 years of age. The GMFCS tells you what category your child fits into; the GMFM tells you how their skills are changing within that category.
The five levels
The descriptions below are condensed from the official GMFCS expanded and revised version. Each level describes what a child can typically do, not what they can do at their absolute best.
Level I
Walks without limitations. The child can walk indoors and outdoors, climb stairs without using a handrail, and perform activities like running and jumping. Speed, balance, and coordination may be reduced compared to peers without CP, but these limitations do not prevent independent mobility.
Level II
Walks with limitations. The child can walk indoors and outdoors but has reduced speed, balance, and coordination. They may use a hand-held mobility device for longer distances outdoors. They can climb stairs using a railing. Walking ability has real limitations that affect participation, especially in uneven terrain or crowded settings.
Level III
Walks using a hand-held mobility device. The child uses a hand-held mobility device such as crutches or a walker to walk in most indoor settings, and uses some form of wheeled mobility when traveling long distances. When seated, they may need a seat belt for pelvic alignment and balance, and they need help from a person or a support surface to stand up from sitting or from the floor.
Level IV
Self-mobility with limitations. The child can sit on the floor with support and may use powered mobility. They are more likely to be transported in a manual wheelchair. They may walk short distances indoors with a hand-held device and adult assistance, but they have difficulty with turning and with uneven surfaces. Independent mobility in the community relies on power chairs or adult assistance.
Level V
Transported in a manual wheelchair in all settings. The child has severe limitations in head and trunk control and needs extensive assistive technology and physical assistance. Self-mobility is severely limited even with assistive devices. The child cannot maintain antigravity head and trunk postures without support from specialized seating or equipment.
How is a child classified?
A health professional determines the GMFCS level from what the child usually does at home, at school, and in the community. That information can come from talking with parents or caregivers or from recent clinic notes, so no formal test is required. According to CanChild, a provider who knows the child can classify them in under 5 minutes, and one who does not may need a 15 to 20 minute observation session. There is also a family report questionnaire for children and youth aged 2 to 18. The levels are based mainly on the child's self-initiated movement, their functional limitations, and their need for hand-held mobility devices or wheeled mobility. Quality of movement matters much less, and classifiers are told not to judge it.
The original 1997 paper reported interrater reliability (how often two professionals classifying the same child independently agree) as a kappa of 0.55 for children under 2 and 0.75 for children aged 2 to 12. Agreement is therefore only moderate for the youngest children, which is worth knowing if your child was classified as an infant.
What does GMFCS mean for the research on this site?
The completed clinical trial comparing DMI to the Bobath approach (NCT07238634) enrolled 58 children aged 2 to 4 with spastic diplegic cerebral palsy at GMFCS levels I to III. Children also had to have head control and be able to follow simple instructions. Children at levels IV and V were not eligible.
This matters for how you read the results when they are published. If the trial finds that DMI works for children at levels I to III, that finding does not automatically extend to a child at level IV or V. And if the trial finds no difference between DMI and Bobath for levels I to III, that also does not tell you whether a child at level IV might benefit from one or the other. The GMFCS gives you the language to ask exactly that question: "This study looked at levels I to III. Where does my child sit on that scale, and what evidence exists for children at that level?"
What you can do with this information
If your child has cerebral palsy and you do not know their GMFCS level, that is a reasonable question to ask your therapist or pediatrician. Knowing the level helps you:
- Understand whether a specific study or claim applies to your child's situation
- Set realistic goals: a child at level III is unlikely to become a level I with any therapy, but meaningful progress within their level is always worth pursuing
- Communicate more precisely with providers, who use this system as a standard shorthand
The GMFCS is not a judgment and not a prognosis. It is a description of where your child is right now, and it gives you a framework for asking the right next question.
Where it appears on this site
The GMFCS is referenced throughout our cerebral palsy guide, where we describe the completed clinical trial's inclusion criteria (GMFCS I to III) and discuss what is known and not known about children at levels IV and V.
Sources
- Palisano R, Rosenbaum P, Walter S, Russell D, Wood E, Galuppi B. Development and reliability of a system to classify gross motor function in children with cerebral palsy. Developmental Medicine and Child Neurology. 1997;39:214-223. PubMed
- GMFCS – Expanded & Revised (GMFCS-E&R) and FAQ, CanChild Centre for Childhood Disability Research, McMaster University. CanChild
- Comparative Effects of Dynamic Movement Intervention and Bobath Approach on Neuromuscular Development in Spastic Cerebral Palsy. ClinicalTrials.gov identifier NCT07238634. Completed June 2026; results not yet posted.
Nothing here is medical advice, and no single study or classification should change your child's care on its own. Discuss anything you read here with your child's pediatrician or therapist.