How Is Mastitis Diagnosed? Tests, Criteria & Process
Mastitis diagnosis relies on Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis. Learn the full diagnostic pathway, clinical criteria, differential workup, and what to expect at your evaluation.
Updated March 27, 2026
Mastitis is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Mastitis is inflammation of the breast tissue, most commonly occurring during breastfeeding due to blocked milk ducts or bacterial infection (S. aureus). It causes breast pain, redness, warmth, and fever; antibiotics and continued breastfeeding are recommended.
Clinical Context
The diagnostic process for Mastitis begins with Thorough history and physical examination followed by basic blood and urine tests; targeted specialist investigation as needed. Key investigations include Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis, Chest X-ray. The gold standard is: Directed investigation based on clinical history and physical examination findings. Clinical guidelines from NICE / BMJ Best Practice / WHO define the diagnostic criteria and recommended investigation pathway.
Clinical Pathway
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How Is Mastitis Diagnosed? Tests, Criteria & Process?+
Mastitis is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Mastitis is inflammation of the breast tissue, most commonly occurring during breastfeeding due to blocked milk ducts or bacterial infection (S. aureus). It causes breast pain, redness, warmth, and fever; antibiotics and continued breastfeeding are recommended.
How do doctors test for mastitis?+
The main tests used to diagnose Mastitis include Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis. Your doctor will select investigations based on your symptoms, clinical findings, and risk factors.
How long does it take to diagnose Mastitis?+
The time to diagnosis varies. Some cases are identified within hours using clinical presentation and blood tests; others require weeks, repeated investigations, or specialist referral.
Can Mastitis be missed on initial testing?+
Yes — Mastitis can be missed if initial tests are negative or if the presentation is atypical. If clinical suspicion remains high, repeat testing or specialist referral is appropriate.
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