Nitroglycerin (Serum/Plasma) Concentration by Immunoassay

Why This Test Is Done

Doctors may order this test if you’re taking nitroglycerin tablets, patches, or sprays to manage angina. It can also be used to check for signs of overdose or improper absorption of the medication. In some cases, it may be part of a broader evaluation for chest pain or heart-related symptoms.

What to Expect Before the Test

No special preparation is needed. The test is typically done by drawing blood from a vein in your arm. If you’re on a patch, your doctor may ask you to remove it temporarily before the blood draw.

What the Results Mean

Results are compared to a general reference range for nitroglycerin in serum/plasma. Low levels may indicate insufficient medication absorption, while very high levels could suggest overdose or improper storage. Your doctor will interpret results in the context of your medical history and symptoms.

Common Reasons for Testing

This test is most commonly used to verify therapeutic drug levels in patients on nitroglycerin therapy, assess compliance with medication, or investigate unexplained symptoms like dizziness or headache that might be linked to medication effects.