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Functional Capacity Assessment (Transfer Function)

Published: August 9, 2026Updated: August 17, 2026

This test evaluates your ability to perform physical tasks, often used to assess overall health, endurance, or recovery from conditions like heart disease or injury.

Quick summary

["Measures how well your body handles daily activities and physical demands."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
46605-2
Short code
CURRENTABILITYTRANSFERRING
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
200
Ref high
350
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
oasis
CPT
84466
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

This test evaluates how efficiently your body transfers energy during physical activity. It may include measurements of oxygen consumption, heart rate response, or endurance limits under controlled exercise conditions. Results help doctors determine your functional ability and identify areas for improvement or concern.

Common Uses

Doctors may order this test to assess fitness levels before surgery, evaluate recovery from illness or injury, diagnose or monitor conditions affecting endurance (e.g., heart disease, chronic lung issues), or guide rehabilitation programs.

How the Test Works

You’ll typically perform a graded exercise test on a treadmill or stationary bike while connected to monitoring devices. Your heart rate, oxygen levels, and performance metrics are recorded to measure how well your body adapts to physical stress.

Preparation Tips

Fast for 2–4 hours before the test if fasting blood work is part of the protocol. Wear comfortable clothing and supportive shoes. Avoid caffeine or nicotine 24 hours prior to prevent interference with results.

Reference range

NCBI: Transferrin 200-350 mg/dLN/A

Specimen: serum

Fasting for 12 hours preferred. Iron supplements should be stopped 24 hours before if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test to evaluate how well your heart, lungs, or muscles respond to physical activity. It helps identify risks for conditions like heart failure, poor circulation, or reduced stamina, guiding treatment plans or lifestyle adjustments.
What do my results mean?
Results show your maximum oxygen uptake (VO₂ max) or endurance capacity. Lower-than-expected values may indicate underlying health issues, while higher values suggest good fitness. Always discuss results with your provider for personalized interpretation.
Can I fast before this test?
Yes, fasting may be required if blood samples are collected during or after the test. Follow your doctor’s instructions to ensure accurate results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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 17, 2026. · Read our editorial policy