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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 RBCs 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
63378-4
Short code
RBC clumps UrnS Ql Micro
Synonyms
RBC clumps UrnS Ql Micro
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
microscopy-light
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 Might This Test Be Done?

Your healthcare provider may order this test if you have symptoms like fatigue, pain, or unusual bruising, or if you have a family history of RBC clumping disorders. It can also be part of routine blood work when evaluating conditions affecting red blood cells.

What Does the Test Involve?

A small blood sample is drawn from a vein, typically in your arm. The sample is then examined under a microscope to look for abnormal clumping patterns. This is a qualitative test, meaning it provides a yes/no result rather than a specific measurement.

What Are Possible Results?

The result will either show normal RBC appearance or indicate abnormal clumping. If clumping is found, further testing may be needed to determine the underlying cause.

What Are the Normal Results?

There are no specific numeric reference ranges for qualitative tests like this one. Instead, the result is interpreted based on visual inspection of the blood sample.

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 the results of this test?
Results are typically available within a few hours to a couple of days, depending on the lab’s processing schedule. Follow up with your healthcare provider for interpretation.
Can I eat or drink anything before this test?
No special preparation is needed for this test. However, avoid alcohol for 24 hours before the draw if your provider has specific instructions.
Is there any risk or discomfort associated with this test?
The blood draw may cause mild discomfort or bruising at the site, but complications are rare. If you have a hard-to-reach vein or are prone to bruising, your provider may use a different technique.
  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