Sputum Test – Indications, Procedures, Results

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 12 min read
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A sputum test, also known as a sputum culture, to detect and identify bacteria or fungi that infect the lungs or breathing passages is a test that your doctor may order when you have a respiratory tract infection or other lung-related disorder to detect and identify...

For severe symptoms, danger signs, pregnancy, child illness, or sudden worsening, seek urgent medical care.

বাংলা রোগী নোট এখনো যোগ করা হয়নি। পোস্ট এডিটরে “RX Bangla Patient Mode” বক্স থেকে সহজ বাংলা সারাংশ যোগ করুন।

এই তথ্য শিক্ষা ও সচেতনতার জন্য। এটি ডাক্তারি পরীক্ষা, রোগ নির্ণয় বা প্রেসক্রিপশনের বিকল্প নয়।

Article Summary

A sputum test, also known as a sputum culture, to detect and identify bacteria or fungi that infect the lungs or breathing passages is a test that your doctor may order when you have a respiratory tract infection or other lung-related disorder to detect and identify bacteria or fungi that infect the lungs or breathing passages, growing in the lungs. Sputum is a thick substance that...

Key Takeaways

  • This article explains How the Test is Performed in simple medical language.
  • This article explains How to Prepare for the Test in simple medical language.
  • This article explains How the Test Will Feel in simple medical language.
  • This article explains Why the Test is Performed in simple medical language.
Educational health guideWritten for patient understanding and clinical awareness.
Reviewed content workflowUse writer and reviewer profiles for stronger trust.
Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

  • Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
  • New weakness, severe pain, high fever, or symptoms after a serious injury.
  • Any symptom that feels urgent, unusual, or unsafe for the patient.
1

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

2

See a doctor

Book a professional medical evaluation if symptoms persist, worsen, recur often, affect daily activities, or occur in a high-risk patient.

3

Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

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Definition

A sputum test, also known as a sputum culture, to detect and identify bacteria or fungi that infect the lungs or breathing passages is a test that your doctor may order when you have a respiratory tract infection or other lung-related disorder to detect and identify bacteria or fungi that infect the lungs or breathing passages, growing in the lungs. Sputum is a thick substance that accumulates when bacteria or fungi grow and multiply in the lungs or bronchi.

A sputum Gram stain is a diagnosis. সহজ বাংলা: রক্ত/প্রস্রাব/নমুনা পরীক্ষা।" data-rx-term="laboratory test" data-rx-definition="A laboratory test examines blood, urine, tissue, or other samples to help diagnosis. সহজ বাংলা: রক্ত/প্রস্রাব/নমুনা পরীক্ষা।">laboratory test used to detect bacteria in a sputum sample. Sputum is the material that comes up from your air passages when you cough very deeply.

The Gram stain method is one of the most commonly used methods to rapidly detect a bacterial infection, including pneumonia.

How the Test is Performed

A sputum sample is needed. You will be asked to cough deeply and spit any material that comes up from your lung into a special container.

  • If this does not work, you may receive a breathing treatment before the test to help you cough more deeply.
  • If you have a dry cough or are unable to produce a sample, a bronchoscopy may be necessary.

The sample is sent to a lab. The lab team member places a very thin layer of the sample onto a glass slide. This is called a smear. Stains are placed on the sample. The lab team member looks at the stained slide under a microscope, checking for bacteria and white blood cells. The color, size, and shape of the cells help identify the bacteria.

How to Prepare for the Test

No preparation is usually needed unless bronchoscopy is necessary.

How the Test Will Feel

How the test will feel depends on the method used to produce the sample. More discomfort is associated with bronchoscopy.

Why the Test is Performed

Your doctor may order this test if you have a persistent or prolonged cough, or if you are coughing up material that has a foul odor or unusual color. The test may also be done if you have other signs and symptoms of respiratory disease or infection.

Normal Results

A normal result means that few to no white blood cells and no bacteria were seen in the sample. The sputum is clear, thin, and odorless.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

An abnormal result means that bacteria is seen in the test sample. You may have a bacterial infection. A culture is needed to confirm the diagnosis.

RIsks

There are no risks associated with coughing up a sample. See the article on bronchoscopy for information regarding risks related to that procedure.

Considerations

The test may need to be repeated if the sample contains only saliva from the mouth.

Gram stain

Urethral discharge – Gram stain; Feces – Gram stain; Stool – Gram stain; Joint fluid – Gram stain; Pericardial fluid – Gram stain; Gram stain of urethral discharge; Gram stain of the cervix; Pleural fluid – Gram stain; Sputum – Gram stain; Skin ulcer. সহজ বাংলা: শরীরের অস্বাভাবিক দাগ, ক্ষত বা ফোলা অংশ।" data-rx-term="lesion" data-rx-definition="A lesion is an abnormal area of tissue such as a spot, wound, patch, lump, or ulcer. সহজ বাংলা: শরীরের অস্বাভাবিক দাগ, ক্ষত বা ফোলা অংশ।">lesion – Gram stain; Gram stain of skin lesion; Gram stain of tissue biopsy

A Gram stain is a test used to identify bacteria. It is one of the most common ways to quickly diagnose bacterial infection in the body.

How the Test is Performed

How the test is performed depends on what tissue or fluid from your body is being tested. The test may be quite simple, or you may need to prepare ahead of time.

  • You may need to provide a sputum, urine, or stool sample.
  • Your health care provider may use a needle to take fluid from your body to test. This could be from a joint, from the sac around your heart, or from the space around your lungs.
  • Your provider may need to take a tissue sample, such as from your cervix or skin.

The sample is sent to a laboratory.

  • A small amount is spread in a very thin layer on a glass slide. This is called a smear.
  • A series of stains are added to the sample.
  • A lab team member examines the stained smear under the microscope, looking for bacteria.
  • The color, size, and shape of the cells help identify the specific type of bacteria.

How to Prepare for the Test

Your provider will tell you what to do to prepare for the test. For some types of tests, you will not need to do anything.

How the Test will Feel

How the test will feel depends on the method used to take a sample. You may not feel anything, or you may feel pressure and mild pain, such as during a biopsy. You may be given some form of pain medicine so you have little or no pain.

Why the Test is Performed

You may have this test to diagnose an infection caused by bacteria. It can also identify the type of bacteria causing the infection.

This test can help find the cause of various health problems, including:

  • Intestinal infection or illness
  • Sexually transmitted diseases (STDs)
  • Unexplained swelling or joint pain
  • Signs of a heart infection or fluid buildup in the thin sac that surrounds the heart (pericardium)
  • Signs of infection of the space around the lungs (pleural space)
  • Cough that will not go away, or if you are coughing up material with a foul odor or odd color
  • Infected skin sore

A normal result means that no bacteria or only “friendly” bacteria were found. Some types of bacteria normally live in certain areas of the body, such as the intestines. Bacteria normally don’t live in other areas, such as the brain or spinal fluid.

Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

Abnormal results may indicate an infection. You will need further tests, such as a culture, to find out more about the infection.

Risks

Your risks depend on the method used to remove tissue or fluid from your body. You may have no risk at all. Other risks are rare, but may include:

  • Infection
  • Bleeding
  • Heart or lung puncture
  • Collapsed lung
  • Breathing problems
  • Scarring

Routine sputum culture

Sputum culture

Routine sputum culture is a diagnosis. সহজ বাংলা: রক্ত/প্রস্রাব/নমুনা পরীক্ষা।" data-rx-term="laboratory test" data-rx-definition="A laboratory test examines blood, urine, tissue, or other samples to help diagnosis. সহজ বাংলা: রক্ত/প্রস্রাব/নমুনা পরীক্ষা।">laboratory test that looks for germs that cause infection. Sputum is the material that comes up from air passages when you cough deeply

How the Test is Performed

A sputum sample is needed. You will be asked to cough deeply and spit any phlegm that comes up from your lungs into a special container. The sample is sent to a lab. There, it is placed in a special dish (culture). It is then watched to see if bacteria or other disease-causing germs grow.

How to Prepare for the Test

Drinking a lot of water and other fluids the night before the test may make it easier to cough up the sputum.

How the Test will Feel

You will need to cough. Sometimes the health care provider will tap on your chest to loosen deep sputum. Or, you may be asked to inhale a steamlike mist to help you cough up the sputum. You may have some discomfort from having to cough deeply.

Why the Test is Performed

The test helps identify the bacteria or other type of germs that are causing an infection in the lungs or airways (bronchi).

Normal Results

In a normal sputum sample, there will be no disease-causing germs.

What Abnormal Results Mean

If the sputum sample is abnormal, the results are called “positive.” Identifying the bacteria, fungus, or virus may help diagnose the cause of:

  • Bronchitis (swelling and infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation in the main passages that carry air to the lungs)
  • Lung abscess (collection of pus in the lung)
  • Pneumonia
  • Tuberculosis
  • Flare-up of chronic obstructive pulmonary disease (COPD) or cystic fibrosis

Risks

There are no risks with this test

Sputum direct fluorescent antibody (DFA) test

Direct immunofluorescence test; Direct fluorescent antibody – sputum

Sputum direct fluorescent antibody (DFA) is a lab test that looks for micro-organisms in lung secretions.

How the Test is Performed

You will produce a sputum sample from your lungs by coughing up mucus from deep inside your lungs. (Mucus is not the same as saliva or spit from the mouth.)

The sample is sent to a lab. There, a fluorescent dye is added to the sample. If the micro-organism is present, a bright glow (fluorescence) can be seen in the sputum sample using a special microscope.

How to Prepare for the Test

If coughing does not produce sputum, a breathing treatment may be given before the test to trigger sputum production.

How the Test will Feel

There is no discomfort with this test.

Why the Test is Performed

Your doctor may order this test if you have signs of certain lung infections.

Normal Results

Normally, there is no antigen-antibody reaction.

What Abnormal Results Mean

Abnormal results may be due to an infection such as:

  • Legionnaire disease
  • Pneumonia due to certain bacteria

Risks

There are no risks with this test.

Sputum fungal smear

KOH test; Fungal smear – sputum; Fungal wet prep; Wet prep – fungal

A sputum fungal smear is a laboratory test that looks for fungus in a sputum sample. Sputum is the material that comes up from air passages when you cough deeply.

How the Test is Performed

A sputum sample is needed. You will be asked to cough deeply and spit any material that comes up from your lungs into a special container.

The sample is sent to a lab and examined under a microscope.

How to Prepare for the Test

There is no special preparation.

How the Test will Feel

There is no discomfort.

Why the Test is Performed

Your health care provider may order this test if you have symptoms or signs of a lung infection, especially if you have a weakened immune system due to certain medicines or diseases such as cancer or HIV/AIDS.

Normal Results

A normal (negative) result means no fungus was seen in the test sample.

Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

Abnormal results may be a sign of a fungal infection. Such infections include:

  • Aspergillosis
  • Blastomycosis
  • Coccidioidomycosis
  • Cryptococcosis
  • Histoplasmosis

Risks

There are no risks associated with a sputum fungal smear.

Sputum stain for mycobacteria

Acid fast bacilli stain; AFB stain; Tuberculosis smear; TB smear

Sputum stain for mycobacteria is a test to check for a type of bacteria that cause tuberculosis and other infections.

How the Test is Performed

This test requires a sample of sputum.

  • To do this, you will be asked to cough deeply and spit the substance that comes up from the lungs (sputum) into a container.
  • You may be asked to breathe in a mist of salty steam. This makes you cough more deeply and produce sputum.
  • If you still do not produce enough sputum, you might have a bronchoscopy .

The test sample is examined under a microscope. Another test, called a culture, is done to confirm the results. A culture test takes a few days to get results. This sputum test can give your doctor a quick answer.

How to Prepare for the Test

It can help to drink a lot of fluids the night before the test. It makes the test more accurate if it is done first thing in the morning.

How the Test Will Feel

There is no discomfort, unless a bronchoscopy needs to be performed.

Why the Test is Performed

The test is performed when the doctor suspects tuberculosis or other Mycobacterium infection.

Normal Results

Results are normal when no mycobacterial organisms are found.

What Abnormal Results Mean

Abnormal results show that the stain is positive for:

  • Mycobacterium tuberculosis
  • Mycobacterium avium-intracellular
  • Other mycobacteria or acid-fast bacteria

Risks

There are no risks unless bronchoscopy is performed.

Considerations

To increase the accuracy of this test, it is sometimes done three times, often three days in a row.

More sophisticated tests are sometimes used to stain sputum for mycobacteria. Check with your health care provider to see if these are available in the laboratory.

FAQ

What happens if the sputum test is positive?

If they see bacteria in your sputum, the smear test result is positive. For the culture, lab staff put some of your sputa into a special container to grow. If bacteria grow, your culture result is positive.

How is a sputum test performed?

  • You will be asked to cough deeply and spit any phlegm that comes up from your lungs into a special container. The sample is sent to a lab. There, it is placed in a special dish (culture). It is then watched for two to three days or longer to see if bacteria or other disease-causing germs grow.
How long does a sputum test take?
  • This test involves collecting a sample of sputum. It is important to follow these instructions to make sure the test is completed correctly. Allow about 20 minutes to carry out the sputum test. the test, so make sure you have enough time to go to your local post box before you start the test.

Can a sputum test detect pneumonia?

  • Sputum cultures are frequently used in the diagnosis of several conditions, including Pneumonia: A sputum culture test can often determine the underlying cause of different types of pneumonia, a kind of lung infection that is a leading cause of death worldwide.

What color is the sputum of tuberculosis?

  • Tuberculosis (TB) If someone has TB, they may cough up green or bloody phlegm. They will also experience symptoms that can include: weight loss. night sweats.

Can I drink water before the sputum test?

  • Do not eat, drink or smoke before coughing up sputum from the lungs. Rinse (do not swallow) the mouth with water before sputum is collected to minimize residual food particles, mouthwash, or oral drugs that might contaminate the specimen.

What is the cost of a sputum test?

  • The average cost of Sputum Culture And Sensitivity in India is ₹ 280 if booked through us. The average market price in India is much higher at ₹ 1000.

What is the easiest way to release sputum?

How to get rid of phlegm and mucus
  1. Keeping the air moist. …
  2. Drinking plenty of fluids. …
  3. Applying a warm, wet washcloth to the face. …
  4. Keeping the head elevated. …
  5. Not suppressing a cough. …
  6. Discreetly getting rid of phlegm. …
  7. Using a saline nasal spray or rinse. …
  8. Gargling with salt water

What does the color of sputum indicate?

  • If you see green or yellow phlegm, it’s usually a sign that your body is fighting an infection. The color comes from white blood cells. At first, you may notice yellow phlegm that then progresses into green phlegm. The change occurs with the severity and length of the potential sickness.

Why is sputum collected in the morning?

  • Collection of early morning specimens is preferred because of the overnight accumulation of secretions; however, you may collect specimens at any time for patients who have a deep cough that is readily productive. Collect sputum in a sterile container for processing and examination.

What if the sputum test is negative?

  • When a patient is “culture-negative,” there are no detectable TB organisms in his/her sputum and the patient is considered completely non-contagious. The likelihood of transmission derives primarily from factors related to the TB patient or the environments in which contacts are exposed.
Doctor visit helper

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A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider
Tests to discuss with doctor
  • Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
  • Relevant blood, urine, imaging, or specialist tests only after clinical assessment
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Sputum Test – Indications, Procedures, Results

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

Add references, clinical guidelines, textbooks, journal articles, or trusted medical sources here. You can edit this area from the RX Article Professional Blocks panel.

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