The persistence, severity, and disability associated with post-COVID conditions, often referred to as "long COVID," pose significant diagnostic and management challenges.
Some patients who have been infected with SARS-CoV-2, the virus that causes COVID-19, have new, recurring, or ongoing symptoms and clinical findings four or more weeks after infection, sometimes after initial symptom recovery.
Post-COVID conditions are associated with a spectrum of physical, social, and psychological consequences.
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The frequency of long-term symptoms and conditions following SARS-CoV-2 infection varies widely in the literature, ranging from 5% to 80%.
Patients with certain comorbidities could be at higher risk for post-COVID conditions, although prevalence by clinical characteristics is limited.
Although older patients might have an increased risk for severe acute disease and related ongoing symptoms, younger patients, including those in good health before SARS-CoV-2 infection, have also reported debilitating post-COVID conditions months after acute illness.
People with post-COVID conditions report experiencing different combinations of the following symptoms:
* Post-exertional malaise (PEM) is the worsening of symptoms following even minor physical or mental exertion, with symptoms typically worsening 12 to 48 hours after activity and lasting for days or even weeks.
Cardiovascular
Myocarditis, heart failure, pericarditis, orthostatic intolerance (e.g., postural orthostatic tachycardia syndrome (POTS))
Pulmonary
Interstitial lung disease, reactive airway disease
Renal
Chronic kidney disease
Dermatologic
Alopecia
Rheumatologic
Reactive arthritis, fibromyalgia, connective tissue disease
Endocrine
Diabetes mellitus, hypothyroidism
Neurologic
Transient ischemic attack/stroke, olfactory and gustatory dysfunction, sleep dysregulation, altered cognition, memory impairment, headache, weakness, and neuropathy
Psychiatric
Depression, anxiety, and post-traumatic stress disorder (PTSD), psychosis
Hematologic
Pulmonary embolism, arterial thrombosis, venous thromboembolism, or other hypercoagulability
Urologic
Incontinence, sexual dysfunction
Other
Weight loss, dysautonomia, vitamin D deficiency, allergies and mast cell activation syndrome, reactivation of other viruses, pain syndromes, and progression of comorbid conditions
Patient History and Physical Exam
Assessment and Testing
Laboratory Testing
Healthcare professionals should also consider the possibility of SARS-CoV-2 reinfection, especially in persons with new or worsening post-COVID conditions.
Basic diagnostic laboratory testing to consider for patients with post-COVID conditions
CATEGORY | LAB TESTS |
Blood count, electrolytes, and renal function | Complete blood count with possible iron studies to follow, basic metabolic panel, urinalysis |
Liver function | Liver function tests or complete metabolic panel |
Inflammatory markers | C-reactive protein, erythrocyte sedimentation rate, ferritin |
Thyroid function | TSH and free T4 |
Vitamin deficiencies | Vitamin D, vitamin B12 |
More specialized diagnostic laboratory testing to consider for patients with post-COVID conditions
CATEGORY | LAB TESTS |
Rheumatological conditions | Antinuclear antibody, rheumatoid factor, anti-cyclic citrullinated peptide, anti-cardiolipin, and creatine phosphokinase |
Coagulation disorders | D-dimer, fibrinogen |
Myocardial injury | Troponin |
Differentiate symptoms of cardiac versus pulmonary origin | B-type natriuretic peptide |
* The specialized diagnostic tests should be ordered in the context of suggestive findings on history and physical examination (e.g., testing for rheumatological conditions in patients experiencing arthralgias).
Additional diagnostic testing for persistent or new respiratory or cardiac concerns should be guided by findings from the patient history and physical examination and results of previous diagnostic testing, and may include:
chest x-ray,
pulmonary function tests,
electrocardiogram, or echocardiogram,
computed tomography (CT) imaging of the chest,
For most patients, the goal of medical management of post-COVID conditions is to optimize function and quality of life.
Follow-up visits with a healthcare professional might be considered every 2–3 months, with frequency adjusted up or down depending on the patient’s condition and illness progression.
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