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Theophylline Blood Test

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The Theophylline Blood Test is used to check the levels of theophylline in the blood, which helps to ensure that the treatment with theophylline is safe and effective.


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Test Code:


CPT Code(s):


Also Known As:

Aminophylline, Blood; Elixophyllin® Elixir; Theo-24®; Theo-Dur®; Theochron™; Theolair™; Uniphyl®






No special preparation is required.

Test Results:

1-2 days. May take longer based on weather, holiday, or lab delays.

Walk-In Lab is prohibited from selling LabCorp tests to residents in the following states:NY, NJ, RI, MA, MD

What is the purpose of this test?

The Theophylline Blood Test is a medical diagnostic test that measures the concentration of theophylline in a patient's blood. Theophylline is a medication used to treat respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). The test is typically ordered by a doctor to monitor the patient's theophylline therapy and ensure that the drug is being administered at a safe and effective dose. It may also be used to identify potential side effects of the medication and to adjust the dosage as needed.

The test involves drawing a small amount of blood from the patient's arm and analyzing it in a laboratory. Results are usually available within a few days and are reported as a numerical value indicating the concentration of theophylline in the blood. It is important for patients to follow their doctor's instructions regarding the timing of the test and any necessary preparation, such as fasting or avoiding certain medications. The Theophylline Blood Test is an important tool for doctors in managing respiratory conditions and ensuring the safety and effectiveness of theophylline therapy.


Who benefits from this test?

The Theophylline Blood Test is beneficial to:

  • Individuals who have been prescribed Theophylline medication for the treatment of respiratory conditions such as asthma, COPD, or bronchitis.
  • People who have experienced adverse reactions or side effects while taking Theophylline.
  • Patients who have undergone changes in their medication dosage or frequency.
  • Individuals who have pre-existing medical conditions, such as liver or kidney disease, that may affect Theophylline metabolism.
  • Those who are taking other medications that may interact with Theophylline.


When should I order a Theophylline Blood Test?

A Theophylline Blood Test is ordered to measure the level of the medication theophylline in the blood. This test is usually ordered when a doctor wants to make sure that the theophylline level in a patient's blood is within the therapeutic range. Some symptoms that may indicate the need for a Theophylline Blood Test include:

  • Difficulty breathing or shortness of breath
  • Wheezing
  • Rapid breathing
  • Chest pain or tightness
  • Irregular heartbeat
  • Nausea, vomiting, or diarrhea
  • Seizures or convulsions
  • Tremors or muscle twitching
  • Anxiety or restlessness

If you are experiencing any of these symptoms, it is important to speak with your doctor to determine if a Theophylline Blood Test is necessary.

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