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Basophilic Normoblasts, Bone Marrow — Manual Count

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

A manual microscopic count of basophilic normoblasts in bone marrow, used as part of a marrow differential to assess blood-cell production.

Quick summary

["This test measures early red-blood-cell precursors in bone marrow to help evaluate blood-cell production."]

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

Key facts at a glance

LOINC
11104-7
Short code
Baso Normoblasts NFr Mar Manual
Synonyms
Baso Normoblasts NFr Mar Manual
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
CPT
84484
SNOMED
302774002
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

What is this test?

Basophilic normoblasts are early forms of red-blood-cell precursors found in bone marrow. This test manually counts these cells in a marrow sample, usually as part of a complete bone marrow differential.

Why might I need this test?

A clinician may order this test to investigate unexplained anemia, abnormal blood-cell counts, or a suspected bone marrow disorder. The results are interpreted with the other marrow cell types and the rest of your blood test results.

How is the test performed?

A laboratory professional examines a prepared bone marrow sample under a microscope and manually counts the basophilic normoblasts. Manual review may help identify and classify cells that are difficult to distinguish by automated methods.

How do I prepare for the test?

No special preparation is required for the count itself. If a bone marrow sample is needed, your clinician will explain the procedure, including use of local anesthetic and any medicines or bleeding precautions you should follow beforehand.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

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

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Basophilic normoblast count

Frequently asked questions

What are basophilic normoblasts?
They are immature red-blood-cell-forming cells in an early stage of development. They normally remain in the bone marrow while maturing into red blood cells.
Why is the count performed manually?
A trained laboratory professional can identify and classify marrow cells more accurately in selected cases, especially when cell appearance is unusual or automated counting is unreliable.
Does an abnormal result diagnose a specific condition?
No. The count is one part of a broader marrow and blood evaluation, and your clinician will interpret it with your symptoms, medical history, and other laboratory findings.
  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