Sputum is mucus coughed up from the lower airways such as the trachea and bronchi. It is commonly examined in medicine for respiratory infections and cytological analysis. Patients can perform a naked eye exam at home by observing sputum color against a white background, noting that yellow or green hues may indicate the presence of pus and potential airway infection. However, color alone does not identify the specific cause, as thickened or discolored sputum can result from infections, allergies, or other factors. Thus, sputum color is a useful screening tool but requires professional evaluation for accurate diagnosis.
Description
The best sputum samples contain very little saliva,2 as saliva contaminates the sample with oral bacteria. This is especially true for samples for laboratory testing in cytology or microbiology. Specimen adequacy is assessed by the laboratory technologists by examining a Gram stain or cytology stain of the sputum. More than 25 squamous epithelial cells at low power magnification exam under the microscope strongly suggest salivary contamination.3 Sputum samples have been used to quantify the degree of airway inflammation in human diseases such as asthma. Specifically, this work has demonstrated that a subgroup of severe asthma patients has airway inflammation that is resistant to treatment with corticosteroids.4
When a sputum specimen is plated out in microbiology, it is best to get the portion of the sample that almost looks like yellow pus onto the swab. If there is any blood in the sputum, this should also be on the swab. Microbiological sputum samples are used to look for infections, such as Moraxella catarrhalis, Mycobacterium tuberculosis, Streptococcus pneumoniae, and Haemophilus influenzae. Other pathogens can also be found.
Purulent sputum5 contains pus, composed of white blood cells, cellular debris, dead tissue, serous fluid, and viscous liquid (mucus). Purulent sputum is typically yellow or green. It is seen in cases of pneumonia, bronchiectasis, lung abscess, or an advanced stage of bronchitis.6
Interpretation
Sputum can be (when examined by the naked eye):
- Bloody7 (hemoptysis)
- Blood-streaked sputum –an indicator of possible inflammation of the throat (larynx and/or trachea) or bronchi; lung cancer; other bleeding erosions, ulcers, or tumors of the lower airway.
- Pink sputum – it indicates sputum evenly mixed with blood from alveoli and/or small peripheral bronchi as is seen in potential pulmonary edema.
- Massive blood – an indicator of possible cavitary tuberculosis or tumor such as lung cancer, or lung abscess; bronchiectasis; lung infarction; pulmonary embolism.
- Red, jelly-like sputum - an indicator of possible pneumonia caused by Klebsiella.
- Green or greenish colored - indicative of potential longstanding respiratory infection (green from degenerative changes in cell debris) as in pneumonia, ruptured lung abscess, chronic infectious bronchitis, and infected bronchiectasis or cystic fibrosis.
- Rust colored – usually caused by pneumococcal bacteria (in pneumonia), pulmonary embolism, lung cancer or pulmonary tuberculosis.
- Brownish –potential indicator of chronic bronchitis (greenish/yellowish/brown); chronic pneumonia (whitish-brown); tuberculosis; lung cancer.
- Yellow, yellowish purulent – an indicator of the sample containing pus. "The sputum color of patients with acute cough and no underlying chronic lung disease does not imply therapeutic consequences such as prescription of antibiotics."8 The color can provide hints as to effective treatment in chronic bronchitis patients:9
- A yellow-greenish (mucopurulent) color suggests that treatment with antibiotics can reduce symptoms. The green color is caused by degenerating neutrophil verdoperoxidase.
- Whitish gray sputum color against a white color background (such as a white sink surface) tends to indicate either a specimen from someone who is dehydrated, and/or from an older person, and/or a specimen with a mixed, modest number of eosinophils and maybe some acute inflammatory neutrophil cells (this last choice tends to suggest chronic allergic bronchitis).
- A white, milky, or opaque (mucoid) appearance means that antibiotics are less likely to be effective in treatment because the likelihood is greater of a viral infection or allergy than of antibiotic-responsive micro-organisms. Thickness may indicate asthma.
- Foamy white – may come from earlier-phase pulmonary edema.
- Frothy pink – may indicate more severe pulmonary edema. Antibiotics may not be necessary at this time.
- Clear – pulmonary embolism (clear to frothy); COPD chronic obstructive pulmonary disease (clear to gray); viral respiratory infection (clear to whitish and sometimes a hint of yellow); asthma (thick and white to yellowish).
See also
External links
References
"Green phlegm and snot 'not always a sign of an infection needing antibiotics'". GOV.UK. 18 November 2013. Retrieved 2022-04-17. https://www.gov.uk/government/news/green-phlegm-and-snot-not-always-a-sign-of-an-infection-needing-antibiotics ↩
Clinical Microbiology procedures handbook, American Society for Microbiology 2nd Ed. 2007 update https://www.ncbi.nlm.nih.gov/nlmcatalog/101315566 ↩
Gershman, Neil H.; Liu, Hong; Wong, Hofer H.; Liu, Jane T.; Fahy, John V. (August 1999). "Fractional analysis of sequential induced sputum samples during sputum induction: Evidence that different lung compartments are sampled at different time points". Journal of Allergy and Clinical Immunology. 104 (2): 322–328. doi:10.1016/S0091-6749(99)70374-X. PMID 10452752. https://doi.org/10.1016%2FS0091-6749%2899%2970374-X ↩
Peters, Michael C.; Kerr, Sheena; Dunican, Eleanor M.; Woodruff, Prescott G.; Fajt, Merritt L.; Levy, Bruce D.; Israel, Elliot; Phillips, Brenda R.; Mauger, David T.; Comhair, Suzy A.; Erzurum, Serpil C.; Johansson, Mats W.; Jarjour, Nizar N.; Coverstone, Andrea M.; Castro, Mario; Hastie, Annette T.; Bleecker, Eugene R.; Wenzel, Sally E.; Fahy, John V. (March 2018). "Refractory airway type 2 inflammation in a large subgroup of asthmatic patients treated with inhaled corticosteroids". Journal of Allergy and Clinical Immunology. 143 (1): 104–113.e14. doi:10.1016/j.jaci.2017.12.1009. PMC 6128784. PMID 29524537. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6128784 ↩
Richard F. LeBlond; Richard L. DeGowin; Donald E. Brown (2004). DeGowin's diagnostic examination. New York: McGraw-Hill. ISBN 0-07-140923-8. 0-07-140923-8 ↩
What can sputum tell us? https://www.medicalnewstoday.com/articles/318924 ↩
Richard F. LeBlond; Richard L. DeGowin; Donald E. Brown (2004). DeGowin's diagnostic examination. New York: McGraw-Hill. ISBN 0-07-140923-8. 0-07-140923-8 ↩
Altiner A, Wilm S, Däubener W, Bormann C, Pentzek M, Abholz HH, Scherer M (2009). "Sputum color for diagnosis of a bacterial infection in patients with acute cough". Scand J Prim Health Care. 27 (2): 70–3. doi:10.1080/02813430902759663. PMC 3410464. PMID 19242860. /wiki/Martin_Scherer ↩
Sputum Color is the Key to Treating Acute COPD Exacerbations https://web.archive.org/web/20110203101936/http://www.pulmonaryreviews.com:80/aug00/pr_aug00_sputum.html ↩