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White Blood Cell Count (Qualitative Manual Method)

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

This test evaluates the presence or absence of white blood cells in your blood, often used to check for infections or immune system concerns.

Quick summary

["Determines if infection or immune issues may be present."]

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

Key facts at a glance

LOINC
814-4
Short code
WBC # Snv Manual
Synonyms
WBC # Snv Manual
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Ref low
4.5
Ref high
11
Critical range
2 N/A – 30 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
CPT
85004
SNOMED
900000000000003002
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

When Is This Test Done?

Doctors may order this test if you have symptoms like fever, sore throat, or unexplained fatigue, or if you’re at risk for infections (e.g., weakened immune system). It can also be part of routine checks for certain conditions.

How Is the Test Performed?

A small blood sample is taken from your arm. The lab examines the sample under a microscope to count white blood cells qualitatively (without precise numbers).

What Does the Result Mean?

A positive result (detectable white blood cells) suggests an infection, inflammation, or immune response. A negative result (no detectable cells) may mean no active infection or immune issue is present, but further testing could be needed.

Possible Causes and Next Steps

High or abnormal white blood cell counts may indicate infections, autoimmune diseases, or other health issues. Low counts could signal immune deficiencies or medications. Your doctor will discuss next steps based on your symptoms and test results.

Reference range

Adult: 4.5-11.0 x 10^9/LN/A

Specimen: fluid

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

WBC Qualitative

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend it to assess suspected infections, monitor immune function, or evaluate symptoms like unexplained fevers or fatigue.
What if my test is positive for white blood cells?
A positive result may prompt additional tests (e.g., blood cultures, specific antibody tests) to identify the cause, such as a bacterial infection or other condition.
Can this test replace other blood tests?
No, this qualitative test is supplementary. It doesn’t replace full blood counts or other detailed tests but helps narrow down potential issues.
  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 16, 2026. · Read our editorial policy