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.

OR

Laboratory findings consistent with the diagnosis of third degree AV block include [abnormal test 1], [abnormal test 2], and [abnormal test 3].

OR

[Test] is usually normal for patients with third degree AV block.

OR

Some patients with third degree AV block may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].

OR

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.,

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