Sarcopenia and the SARC-F test, explained
Sarcopenia is the loss of muscle strength and mass that comes with age. SARC-F is a five-question screening test for it: strength, walking, rising from a chair, climbing stairs and falls. Each answer scores 0 to 2, for a total of 0 to 10. A score of 4 or more suggests likely sarcopenia and is a reason to see a doctor for a strength test. European experts recommend SARC-F as the first step in finding sarcopenia.
Sources: Malmstrom & Morley, J Am Med Dir Assoc 2013 · Cruz-Jentoft et al., Age and Ageing 2019 (EWGSOP2).
How the SARC-F score works
| How much difficulty do you have… | 0 points | 1 point | 2 points |
|---|---|---|---|
| Lifting and carrying 10 pounds (4.5 kg) | None | Some | A lot or unable |
| Walking across a room | None | Some | A lot or unable |
| Moving from a chair or bed | None | Some | A lot or unable |
| Climbing a flight of 10 stairs | None | Some | A lot or unable |
| Falls in the past year | None | 1–3 falls | 4 or more |
This calculator uses the published SARC-F cut-off: 4 or more is a positive screen and a reason for follow-up; 0–3 is below the cut-off. SARC-F was validated only as “under 4” versus “4 or more”, so we don’t label low scores as “low risk”.
SARC-F is a screening test with very high specificity but low sensitivity. When studies are pooled, it picks up only about 21–32% of people who have sarcopenia (Ida 2018; Lu 2021), and EWGSOP2 notes that it mostly detects severe cases. A score below 4 does not rule sarcopenia out if you are losing strength.
In older adults in two US cohorts, a score of 4 or more was also linked to higher mortality at follow-up (Malmstrom 2016).
Adding calf circumference (SARC-CalF)
Calf size is a simple marker of muscle mass. SARC-CalF adds it to SARC-F as a sixth item: 0 points if your calf is at or above the cut-off, 10 points if it is below. The total runs from 0 to 20, and 11 or more is a positive screen (Bahat 2018). Because SARC-F is at most 10, a positive SARC-CalF always means a low calf plus at least 1 SARC-F point.
We use the cut-offs from the Asian Working Group for Sarcopenia 2019 consensus, which starts screening with any of three entry points: calf under 34 cm (men) or under 33 cm (women), SARC-F 4 or more, or SARC-CalF 11 or more (Chen 2020). The calculator shows a positive screen if any of them is met. A value exactly on the cut-off counts as not low.
How to measure: stand with your feet slightly apart and wrap a soft tape around the widest part of your calf, without pressing into the skin.
| Person | SARC-F | Calf | SARC-CalF | Result |
|---|---|---|---|---|
| Man, 72 | 3 | 33.0 cm (low) | 13 | Positive screen |
| Woman, 68 | 7 | 35.0 cm | 7 | Positive screen (SARC-F) |
| Woman, 75 | 0 | 31.0 cm (low) | 10 | Positive screen (calf) |
| Man | 1 | 34.0 cm (on the cut-off) | 1 | Below the cut-off |
In the original Brazilian study of 179 adults aged 60 and over, adding calf circumference raised SARC-F’s accuracy for sarcopenia (area under the curve 0.592 to 0.736; Barbosa-Silva 2016). In a Turkish community sample with few cases it raised specificity to 90–98% but not sensitivity (Bahat 2018). EWGSOP2 mentions a lower calf cut-off, under 31 cm, as a stand-in for muscle mass when no other measurement is available.
These tools were validated in people aged 60 and over.
How doctors confirm sarcopenia
After a positive screen, the European Working Group on Sarcopenia in Older People (EWGSOP2) suggests checking muscle strength first:
| Test | Low strength |
|---|---|
| Grip strength (hand-held dynamometer) | Under 27 kg for men, under 16 kg for women |
| Chair stand test | More than 15 seconds for five rises from a chair without using your arms |
If strength is low, muscle mass is measured, for example with a DXA scan, and physical performance with tests such as walking speed.
The optional strength and walking checks
EWGSOP2 defines sarcopenia in three steps: low muscle strength means probable sarcopenia; low strength plus low muscle quantity or quality confirms it; and if physical performance is also low, sarcopenia is severe (Cruz-Jentoft 2019). The first and third steps can be measured outside a scanner, so the calculator lets you enter them:
| Test | Counts as low |
|---|---|
| Grip strength (best reading) | Under 27 kg (men), under 16 kg (women) |
| Chair stand, 5 rises without arms | More than 15 seconds |
| 4 m walk at usual pace | Gait speed 0.8 m/s or less (4 m ÷ your time) |
For example, a man with a grip of 25 kg, a 13.0-second chair stand and a 4 m walk in 4.4 seconds (0.91 m/s) has low grip strength, so the result is probable sarcopenia; his walking speed is not low. A woman with a grip of 17 kg, a 16.2-second chair stand and a 4 m walk in 5.5 seconds (0.73 m/s) has a slow chair stand and a low walking speed.
Muscle mass needs a DXA or BIA measurement, so the calculator never says you “have” sarcopenia. Grip strength needs a hand dynamometer (many clinics and gyms have one). Only do the chair and walking tests if you can do them safely, with a sturdy chair against a wall and someone nearby.
How to prevent and reverse muscle loss
- Strength training at least 2 days a week, working all major muscle groups (CDC). Muscle responds to training at any age.
- Enough protein. An expert group (PROT-AGE) recommends 1.0–1.2 g of protein per kg of body weight a day for healthy older adults, more than the usual adult guideline.
- Stay active every day and limit long periods of sitting.
- Train balance to lower the risk of falls. Falls and weak bones often go together; check your osteoporosis risk.
Muscle strength is closely tied to cardio fitness; see your fitness age.
Sarcopenia FAQ
What is sarcopenia?
Sarcopenia is the loss of muscle strength and mass with age. It makes everyday tasks harder and raises the risk of falls, fractures and losing independence.
How do you test for sarcopenia?
The first step is a screen such as the SARC-F questionnaire on this page. If the score is 4 or more, a doctor checks grip strength or a chair stand test, then muscle mass.
What SARC-F score means sarcopenia?
A score of 4 or more out of 10 is a positive screen and needs follow-up. It is a screening result, not a diagnosis. A lower score does not rule sarcopenia out: in pooled studies SARC-F found only about 21–32% of people with sarcopenia.
What are the early signs of sarcopenia?
Finding it harder to carry shopping, climb stairs or get up from a chair, walking more slowly, weaker grip and more falls.
Can you reverse sarcopenia at 70?
Strength and muscle can be improved at any age. Regular strength training and enough protein are the main treatments; talk to a doctor or physiotherapist about a safe plan.
Why add calf circumference to SARC-F?
SARC-F alone misses most people with sarcopenia. Adding calf circumference (SARC-CalF) improved screening accuracy in the original study (area under the curve 0.592 to 0.736), and the Asian Working Group for Sarcopenia 2019 uses a low calf, SARC-F 4 or more, or SARC-CalF 11 or more as starting points for a check.
What calf circumference is too low?
For sarcopenia screening, the Asian Working Group for Sarcopenia 2019 uses under 34 cm for men and under 33 cm for women, measured at the widest part of the calf while standing. The European group EWGSOP2 mentions under 31 cm as a rough stand-in for low muscle mass when nothing else is available.
Can I test my muscle strength at home?
Partly. Time how long it takes to stand up from a chair five times without using your arms (more than 15 seconds is low) and how long you take to walk 4 metres at your usual pace (0.8 m/s or slower is low), both EWGSOP2 cut-offs. Only do them if you can do so safely. Grip strength needs a hand dynamometer.
What is the difference between probable, confirmed and severe sarcopenia?
In the EWGSOP2 definition, low muscle strength alone is probable sarcopenia. A low muscle-mass or muscle-quality measurement confirms it. If physical performance, such as walking speed, is also low, it is called severe sarcopenia.
Last reviewed: · Sources · Educational screening, not medical advice.
Sources
- Malmstrom TK, Morley JE. SARC-F: a simple questionnaire to rapidly diagnose sarcopenia. J Am Med Dir Assoc, 2013;14:531–532.
- Malmstrom TK et al. SARC-F: a symptom score to predict persons with sarcopenia at risk for poor functional outcomes. J Cachexia Sarcopenia Muscle, 2016;7:28–36.
- Ida S et al. SARC-F for screening of sarcopenia among older adults: a meta-analysis of screening test accuracy. J Am Med Dir Assoc, 2018;19:685–689.
- Lu J-L et al. Screening accuracy of SARC-F for sarcopenia in the elderly: a diagnostic meta-analysis. J Nutr Health Aging, 2021;25:172–182.
- Barbosa-Silva TG et al. Enhancing SARC-F: improving sarcopenia screening in the clinical practice. J Am Med Dir Assoc, 2016;17:1136–1141.
- Bahat G et al. Comparing SARC-F with SARC-CalF to screen sarcopenia in community living older adults. J Nutr Health Aging, 2018;22:1034–1038.
- Chen L-K et al. Asian Working Group for Sarcopenia: 2019 consensus update on sarcopenia diagnosis and treatment. J Am Med Dir Assoc, 2020;21:300–307.
- Cruz-Jentoft AJ et al. Sarcopenia: revised European consensus on definition and diagnosis (EWGSOP2). Age and Ageing, 2019.
- Bauer J et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc, 2013.
- CDC. Adult Activity: An Overview.