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Red Blood Cell Clumping (Qualitative) in Whole Blood

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

This test checks for abnormal clumping of red blood cells (RBCs) in your blood sample, which may indicate conditions like sickle cell disease or other hemolytic disorders.

Quick summary

["Clumping of red blood cells can affect blood flow and may require further evaluation."]

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

Key facts at a glance

LOINC
50226-0
Short code
RBC clumps Ur Ql Comp Assist
Synonyms
RBC clumps Ur Ql Comp Assist
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
2 N/A – 7 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
computer-assisted
CPT
85041
SNOMED
900000000000003001
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like fatigue, pain, or signs of anemia, or if they suspect conditions affecting your red blood cells. It can also be part of routine screening in certain populations.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw a blood sample. The test is usually done in a lab and results are qualitative (yes/no).

What the Results Mean

Positive results (clumping detected) suggest abnormal RBCs that may need further testing, such as blood smear evaluation or genetic testing. Negative results mean no obvious clumping is seen.

Common Conditions Linked to RBC Clumping

Clumping can be linked to inherited blood disorders (e.g., sickle cell trait/disease), autoimmune conditions, or infections. It may also appear in certain medications or blood transfusions.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: urine

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

RBC Clumping Screen

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–2 business days, depending on lab processing times. If clumping is detected, your provider may schedule additional tests sooner.
Can I eat or drink before this test?
No special diet or fasting is required. You can eat and drink normally, but avoid caffeine or alcohol before your blood draw if your provider advises it.
Is there any risk or discomfort with this test?
Most people experience mild discomfort or bruising at the injection site. Rarely, there may be a slight reaction like swelling or redness. If you have a bleeding disorder, inform your provider before the test.
  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