Histamine, Plasma Test
A histamine, plasma test measures the amount of histamine present in a blood sample. Histamine is a substance the body makes naturally, and this marker is sometimes discussed as part of an allergy or histamine-related evaluation guided by a clinician.
About this test
Histamine is a compound the body produces and uses in a number of normal processes, including parts of the immune response. Because it can rise and fall quickly and is involved in many pathways, a plasma histamine measurement is a snapshot that a clinician reads carefully rather than a simple yes-or-no signal.
The test is done with a routine blood draw at a Quest patient service center. A phlebotomist collects a sample from a vein, usually in the arm, and the sample goes to the laboratory, where the plasma portion is analyzed.
Who might consider this test?
- Others come to the topic after reading about histamine and want to understand what the marker is and how it fits.
Test details
| Quest code | 36586 |
|---|---|
| Methodology | Enzyme Immunoassay |
| Sample type | 1 mL plasma |
| Patient preparation | Avoid taking allergy causing drugs, antihistamines, oral corticosteroids and substances which block H2 receptors for 24 hours before your blood draw. |
| Collection | Quest patient service center |
Reference range
≤1.8 ng/mL
Reference ranges are general guidance. The range printed on your own laboratory report is the one that applies to your result.
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Additional details
What this test looks at
The test looks at how much histamine is present in the plasma at the time the sample is drawn. Histamine is part of normal physiology and shifts readily, so the measurement is best understood as a moment-in-time reading rather than a stable characteristic. A clinician considers that changeability when deciding what, if anything, a result suggests.
Because so many ordinary factors can nudge histamine, this marker is rarely informative in isolation. Its value comes from being read alongside a person's story and any related markers, which is where a clinician's interpretation matters most.
How it is often used
Clinicians sometimes include a plasma histamine measurement within a broader evaluation when a person's symptoms raise questions about histamine-related pathways. It may be paired with other markers and with a careful history so a clinician can look for patterns rather than lean on one number. Timing of the draw can be part of the plan, which is why this test is usually arranged with clear guidance from the ordering clinician.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does a plasma histamine test measure?
It measures the amount of histamine in the plasma portion of a blood sample. Histamine is a substance the body makes naturally and is sometimes discussed in allergy or histamine-related evaluations.
Why does timing matter for this test?
Histamine can change quickly, so when and how the sample is drawn and handled can affect the reading. A clinician may give specific timing instructions, which is why the test is usually arranged with guidance.
Can a single result explain my symptoms?
Rarely on its own. Many everyday factors can influence histamine, so a clinician reads the marker alongside symptoms, history, and other tests rather than drawing conclusions from one value.
How is the sample collected?
Through a routine blood draw at a Quest patient service center. A phlebotomist takes a small sample from a vein in the arm, and the laboratory analyzes the plasma portion.
Do I need to prepare?
Follow whatever preparation and timing instructions your ordering clinician provides. Because histamine is time-sensitive, those details can matter more here than with many routine tests.
How much does the Histamine test cost?
The cash price at Celio Health is $275. That covers the physician's order and sample collection at a Quest patient service center — no insurance is needed and there's no separate doctor's visit to pay for.
Do I need to prepare for this test?
Avoid taking allergy causing drugs, antihistamines, oral corticosteroids and substances which block H2 receptors for 24 hours before your blood draw. This is the preparation Quest publishes for this test; if your clinician gives you different instructions, follow theirs.