Muscle Strength or Functional Capacity Assessment (via Grip Strength or Other Physical Performance Test)
This test measures how well your muscles work together to help you move and stay active. Weakness can be due to many causes, including muscle disorders, nerve damage, or other health conditions.
["Weakness may signal underlying issues needing medical evaluation."]
Key facts at a glance
- LOINC
- 28398-6
- Short code
- WEAKNESS
- Synonyms
- —
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- reported-hiv-ssc
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
Muscle strength tests often include grip strength measurements or timed physical performance tasks (e.g., walking speed, chair stands). These assess how effectively your muscles generate force or sustain movement. Weakness may also be evaluated through functional capacity tests, such as how long you can stand or climb stairs without fatigue.
Common Causes of Weakness
Weakness can stem from muscle disorders (e.g., myopathies), nerve or muscle damage (e.g., neuropathy), chronic conditions (e.g., diabetes, thyroid issues), or medications. Some tests may also check for underlying metabolic or systemic problems affecting muscle function.
How the Test Is Performed
This is not a blood or urine test but involves physical assessment. A healthcare provider may measure grip strength using a dynamometer or observe how you perform daily activities (e.g., lifting, walking). Some tests may include timed movements or balance evaluations.
When to Expect Results
Results are typically provided immediately during the visit or within a few days. They help identify whether muscle function is normal or if further evaluation (e.g., blood tests, imaging) is needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Muscle Function Test
Frequently asked questions
Why might I need this test?
What does a low or high result mean?
Can I prepare for this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy