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Humerus Length (Bone Measurement)

Published: August 9, 2026Updated: August 16, 2026

This test measures the length of your upper arm bone (humerus) to help evaluate growth, bone development, or potential skeletal abnormalities.

Quick summary

["Assessing bone growth or structural health through direct measurement of the humerus."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
11972-7
Short code
Fet Humerus Length Est from GA.Merz87
Synonyms
Fet Humerus Length Est from GA.Merz87
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
estimated-from-gestational-age-merz
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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have concerns about growth patterns, suspected skeletal disorders, or if you’re being monitored for conditions like rickets, bone dysplasia, or other developmental issues. It could also be part of a general physical examination or pre-surgical planning.

How the Test Works

The test involves measuring the humerus directly, often using X-ray imaging or physical examination. No blood, urine, or other bodily fluids are required—just a straightforward measurement of the bone’s length.

Preparation for the Test

No special preparation is needed. You may be asked to remove clothing from the shoulder down, and a technician will measure the bone length using a calibrated tool or imaging device.

What to Expect During the Procedure

The procedure is quick and painless. If imaging is used (e.g., X-ray), you may need to stand still for a few seconds while the technician takes measurements. If a physical measurement is done, you’ll simply have your arm positioned for accuracy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal humerus length can indicate underlying conditions affecting bone growth, such as genetic disorders, hormonal imbalances, or chronic illnesses. It may also help diagnose conditions like achondroplasia, osteogenesis imperfecta, or other skeletal dysplasias. Regular monitoring can guide treatment decisions or track progression of developmental issues.

Short name

Bone Length Assessment

Frequently asked questions

How long will it take to get my results?
Results are typically available immediately if measured directly or within a few days if imaging-based. Your healthcare provider will discuss them with you during your follow-up visit.
Is this test painful?
No, the test is not painful. If imaging is involved, you may feel a brief sensation of cold from the X-ray machine, but no discomfort is expected.
Can I eat or drink before this test?
No special dietary restrictions apply. You can eat and drink normally before the test, as it does not involve blood or urine samples.
  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 16, 2026. · Read our editorial policy