Third degree AV block laboratory findings
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Soroush Seifirad, M.D.[2] Raviteja Guddeti, M.B.B.S. [3]
Overview
An elevated/reduced concentration of serum/blood/urinary/CSF/other [lab test] is diagnostic of third degree AV block.
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Laboratory findings consistent with the diagnosis of third degree AV block include [abnormal test 1], [abnormal test 2], and [abnormal test 3].
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[Test] is usually normal for patients with third degree AV block.
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Some patients with third degree AV block may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].
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There are no diagnostic laboratory findings associated with third degree AV block.
Laboratory Findings
There are no diagnostic laboratory findings associated with third degree AV block.
OR
An elevated/reduced concentration of serum/blood/urinary/CSF/other [lab test] is diagnostic of third degree AV block.
OR
[Test] is usually normal among patients with third degree AV block.
OR
Laboratory findings consistent with the diagnosis of third degree AV block include:
- [Abnormal test 1]
- [Abnormal test 2]
- [Abnormal test 3]
OR
Some patients with third degree AV block may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].
Laboratory Findings
The following laboratory studies should be done, depending upon the cause, while investigating a case of complete heart block.
- Complete blood count - may reveal anemia (low RBC count), infection (leukocytosis is seen in myocarditis, acute rheumatic fever and viral infections)
- Differential count
- Serum electrolytes - hyperkalemia (renal insufficiency)
- PT and aPTT may be ordered routinely
- Blood digoxin levels should be measured in case of digoxin overdose
- Myocarditis related studies - HIV serologies, Lyme titers, Chagas titers, enterovirus PCR, adenovirus PCR
- Peripheral blood smears can aid in the diagnosis of hematological disorders like thalassemia major, Hodgkins lymphoma etc.,