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Pneumococcal Antigen in Sputum (Qualitative)

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

This test checks for the presence of *Pneumococcus* bacteria in your sputum, which can help diagnose pneumonia caused by this infection.

Quick summary

["A positive result may indicate pneumonia due to *Pneumococcus* and guide treatment decisions."]

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

Key facts at a glance

LOINC
10651-8
Short code
C pneum Ag Spt/Bro Ql
Synonyms
C pneum Ag Spt/Bro Ql
Category
chemistry
Sample
sputum
Container
Sterile sputum container
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85610
SNOMED
396252006
Specimen volume
3-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
TAT
4–24 hours
Order
routine

Why This Test Matters

Pneumonia is a lung infection that can cause fever, cough, and difficulty breathing. *Pneumococcus* is a common cause, and this test helps confirm if it’s responsible. Early identification can lead to faster treatment with antibiotics.

How the Test Works

A sample of your sputum (phlegm coughed up from your lungs) is tested for *Pneumococcus* antigens using a rapid immunoassay method. This detects the bacteria’s unique proteins without needing to grow them in a lab.

Sample Collection

You’ll cough into a sterile container, and the sample is sent to the lab. The test is usually done in a doctor’s office or clinic within hours.

What to Expect

No special preparation is needed, but you may be asked to avoid cough suppressants or smoking before the test. Results are typically available within 1–2 hours.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: sputum

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sputum Pneumococcal Test

Frequently asked questions

How long does it take to get results?
Results are usually ready within 1–2 hours of testing, depending on the lab’s process. Your healthcare provider will discuss them with you.
Can I take antibiotics before this test?
No, antibiotics may affect the test results. If you’ve already taken them, let your doctor know so they can interpret the results correctly.
Is this test covered by insurance?
Check with your insurance provider, as coverage depends on clinical necessity. Your doctor can confirm if this test is medically appropriate for your situation.
  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