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Hemoglobin S Polymerization (Serum/Plasma)

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

This test measures the presence of abnormal hemoglobin S polymers in your blood, which can indicate conditions like sickle cell disease or other hemoglobinopathies.

Quick summary

["This test helps assess red blood cell stability and potential risks of sickling in your blood."]

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

Key facts at a glance

LOINC
14565-6
Short code
Hgb sp3 Stl gastro Ql
Synonyms
Hgb sp3 Stl gastro Ql
Category
hematology
Sample
stool
Container
Clean container
Units
N/A
Ref low
10
Ref high
40
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Your doctor may order this test to help evaluate your overall health, screen for certain medical conditions, or monitor a diagnosis you already have. The results provide important information that helps guide decisions about your treatment plan and any follow-up care you may need.

Your healthcare provider may order this test if you have a family history of sickle cell disease, experience symptoms like pain, fatigue, or unusual blood test results, or if you’re being evaluated for conditions affecting hemoglobin structure.

Your test results show the level or value that was measured in your sample. A result within the expected range usually suggests normal function, while a value that is too high or too low may point to a condition that needs further evaluation and interpretation by your healthcare provider.

Higher-than-normal levels may suggest abnormal hemoglobin polymerization, which can lead to sickling of red blood cells and related complications. Results are interpreted by a healthcare professional based on your clinical picture.

A trained healthcare professional will collect your sample, usually from a vein in your arm, using a small needle. Most patients do not need special preparation, but you should follow any specific instructions from your doctor, such as avoiding certain foods, drinks, or medications before the test.

Blood is drawn from a vein, typically in the arm. The sample is processed into serum or plasma for analysis. This test does not require fasting.

Abnormal results can have many different causes, including infection, inflammation, chronic illness, dehydration, recent intense exercise, certain medications, or problems with organs such as the liver, kidneys, or thyroid. Your doctor will review your complete medical history before drawing any conclusions.

Elevated levels are most commonly associated with sickle cell trait or disease, but other conditions or medications (e.g., certain drugs that alter hemoglobin) may also affect results.

Reference range

Adult: 10-40 U/LN/A

Specimen: stool

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Hemoglobin SPolymerization

Frequently asked questions

Hemoglobin S polymerization is clinically significant because abnormal hemoglobin can cause red blood cells to become rigid and sickle-shaped, leading to blockages in blood vessels, pain crises, infections, and organ damage. Regular monitoring helps manage symptoms and prevent complications.
Normal ranges vary depending on your age, sex, and the laboratory that analyzes your sample, so your report will list the reference range directly next to your result. Ask your doctor to explain what your specific values mean for your overall health and whether any follow-up testing is needed.
There is no single reference range provided here because levels vary based on individual health, disease state, and testing methodology. Your results will be reviewed by a healthcare provider in the context of your overall health.
Fasting is not always required, but some tests do require 8 to 12 hours without food or drink except water. Your doctor or the laboratory staff will tell you in advance whether you need to fast before your sample is collected, so always confirm before your appointment.
No, fasting is not required for this test.
Frequency depends on your medical condition and provider’s recommendations. Some patients with sickle cell disease may need periodic monitoring, while others may only need it during specific evaluations.
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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