Diagnostic Approach for Suspected Chronic Borreliosis

Initial Diagnostic Confirmation

The Centers for Disease Control and Prevention (CDC) recommends documenting objective evidence of previous Lyme disease that met CDC case definitions, including either physician-documented erythema migrans or laboratory-confirmed infection using validated testing methods 1, 3
The CDC suggests confirming the original diagnosis was made by well-qualified laboratories using recommended two-tiered testing (ELISA/EIA followed by Western immunoblot), not unvalidated methods like urine antigen tests or blood microscopy 1, 2
The Infectious Diseases Society of America recommends reviewing whether the patient received appropriate antibiotic treatment and whether objective manifestations resolved or stabilized after therapy 1, 2

The CDC recommends using two-tiered serologic testing: Initial IgG-ELISA and IgM-ELISA screening, followed by confirmatory IgG and IgM immunoblot only if positive or borderline 3, 4
The CDC suggests that for disease duration >6-8 weeks, only IgG immunoblot is clinically interpretable; IgM results should be disregarded to avoid false positives 4
The CDC notes that serology remains positive for months to years after successful treatment and cannot indicate active infection 4

The American College of Physicians recommends testing for babesiosis if the patient has unexplained fever, hemolytic anemia, or thrombocytopenia 1, 2
The Infectious Diseases Society of America suggests considering anaplasmosis testing in patients with fever and leukopenia 4
The CDC recommends performing targeted laboratory screening to identify conditions that could explain symptoms, including basic metabolic panel, thyroid function tests, complete blood count, inflammatory markers, liver function tests, calcium, phosphorus levels, urinalysis, autoimmune screening, and syphilis testing 1, 2, 3

The European Federation of Neurological Societies recommends lumbar puncture with CSF analysis: cell count/differential, protein, glucose if CNS symptoms are present 5
The European Federation of Neurological Societies notes that CSF should show lymphocytic pleocytosis and intrathecal antibody production in true neuroborreliosis 5
The American Psychiatric Association recommends excluding major depressive disorder with psychotic/melancholic features, bipolar disorder, schizophrenia, delusional disorders, or eating disorders 1, 2

The Infectious Diseases Society of America recommends that if all exclusions are negative, the patient may meet criteria for post-Lyme disease syndrome if they have documented prior Lyme disease with CDC case definition, resolution/stabilization of objective manifestations after appropriate treatment, onset of fatigue, widespread musculoskeletal pain, or cognitive complaints within 6 months of diagnosis, continuous or relapsing symptoms for ≥6 months after completing antibiotics, and symptoms cause substantial reduction in occupational, educational, social, or personal activities 1, 2
The Infectious Diseases Society of America notes that antibiotic therapy has not proven useful and is not recommended for patients with chronic subjective symptoms (≥6 months) after completing recommended treatment regimens 2