Hemoglobin S Polymerization (Serum) – 5% Threshold Screening
This test checks for the presence of abnormal hemoglobin S, a variant linked to sickle cell disease, by detecting its tendency to form polymers (clumps) in blood. It’s part of a screening process to identify individuals at higher risk.
["This test helps screen for sickle cell trait or disease by detecting clumping of hemoglobin S, which can indicate genetic risk."]
Key facts at a glance
- LOINC
- 12504-7
- Short code
- Hgb sp5 Stl gastro Ql
- Synonyms
- Hgb sp5 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
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have a family history of sickle cell disease, live in an area with higher prevalence of sickle cell trait, or experience symptoms like fatigue, pain, or frequent infections. It’s also sometimes included in routine genetic screening.
What to Expect During the Test
A small blood sample is drawn from a vein in your arm. The blood is processed to separate serum, which is then tested for hemoglobin S polymerization. The result is qualitative (yes/no) rather than a numeric value.
Test Preparation
No special preparation is needed. However, avoid strenuous activity or eating heavy meals 1–2 hours before the test if instructed by your provider.
What the Results Mean
A positive result indicates a high likelihood of hemoglobin S polymerization, suggesting you may have sickle cell trait or disease. A negative result means no significant clumping was detected, but further testing may still be needed for confirmation.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This screening test is not diagnostic on its own but flags individuals for further evaluation. If positive, your doctor may order additional tests (like hemoglobin electrophoresis) to confirm sickle cell trait or disease. Early detection can help manage symptoms and plan preventive care.
Short name
Hemoglobin S Polymer Screen (Serum)
Frequently asked questions
What does a positive result mean?
Can I get this test at home?
How often should I get 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