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There is no level of BNP that perfectly separates patients with and without heart failure. [14]In screening for congenital heart disease in pediatric patients, an NT-proBNP cut-off value of 91 pg/mL could differentiate an acyanotic heart disease (ACNHD) patient from a healthy patient with a sensitivity of 84% and specificity of 42%. [15]
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
However, this can often be clarified with tests like X-rays and blood work. [3] Rapid testing of BNP and NT-proBNP can also tell if the problem is in the heart or the lungs, though, specific lung problems can also raise NP levels. Due to this, BNP levels can be high for cases other than heart failure. [3]
The BNP test is also used for the risk stratification of patients with acute coronary syndromes. [42] [43] When interpreting an elevated BNP level, values may be elevated due to factors other than heart failure. Lower levels are often seen in obese patients. [44] Higher levels are seen in those with renal disease, in the absence of heart failure.
Screening for thyroid disease in patients without symptoms is a debated topic although commonly practiced in the United States. [8] If dysfunction of the thyroid is suspected, laboratory tests can help support or rule out thyroid disease. Initial blood tests often include thyroid-stimulating hormone (TSH) and free thyroxine (T4). [9]
The biological half-life of BNP, however, is twice as long as that of ANP, and that of NT-proBNP is even longer, making these peptides better choices than ANP for diagnostic blood testing. In addition to the mammalian natriuretic peptides (ANP, BNP , CNP ), other natriuretic peptides with similar structure and properties have been isolated ...