Lab test
Black Mold Exposure Test (IgG)
Black Mold Exposure Test (IgG) is a laboratory test you can request directly. A blood test that looks for IgG antibodies against common black mold species, which may indicate past or ongoing exposure.
Lab requirements in Black Mold Exposure Test (IgG)
Here is what you need before ordering and completing the Black Mold Exposure Test (IgG). Review each item and confirm the details with the collection lab.
- Physician's order
- Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
- Fasting
- Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
- Preparation
- Preparation is usually not required, but follow any specific instructions provided by the collection lab. If you take medications or have health conditions, ask the lab or your clinician…
- Sample & visit
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Identification
- Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
- Turnaround
- 1-3 business days
- Availability
- Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.
Before you go
- Order your test before visiting a lab, then use the requisition form in your account.
- Print the requisition form, or fax it to the lab directly from your account.
- No scheduling is needed — visit the collection lab during its normal business hours.
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Bring a government-issued photo ID in case the lab requests it.
- Results are posted to your secure account within 1–3 business days.
Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.
What this test is
This test measures immunoglobulin G (IgG) antibodies in your blood that react to molds often called black mold, such as Stachybotrys chartarum and related species. IgG antibodies can reflect prior or repeated exposure rather than a current infection. The test is typically used as part of a broader evaluation when mold exposure is suspected.
What it measures
- IgG antibodies to Stachybotrys chartarum — Reflects immune system exposure to this common black mold species.
- IgG antibodies to Aspergillus species — Reflects exposure to molds often found in water-damaged buildings.
- IgG antibodies to Penicillium species — Reflects exposure to a mold commonly associated with indoor dampness.
- IgG antibodies to Cladosporium species — Reflects exposure to a mold frequently found indoors and outdoors.
- Total IgG or control — Helps assess overall antibody response and test validity.
What the test involves
A healthcare professional collects a small blood sample from a vein in your arm using a standard blood draw. The sample is then sent to a laboratory for analysis.
Why it is often ordered
A clinician might order this test when a person reports symptoms or living conditions that suggest possible mold exposure, and other causes have been considered. It is generally used alongside a clinical history and other tests, not as a stand-alone diagnosis.
Preparation
Preparation is usually not required, but follow any specific instructions provided by the collection lab. If you take medications or have health conditions, ask the lab or your clinician whether any special preparation is needed.
How results are reported
Results are reported as a qualitative positive or negative, or as a numeric level with a reference range, depending on the laboratory method. Reference ranges and reporting formats vary by laboratory, so your results should be interpreted in the context of the lab that performed the test.
Before you go
- Whether any medications or health conditions might affect the test
- If fasting or other preparation is required before the blood draw
- How and when results will be shared with you and your clinician
FAQ
Frequently asked questions
What does a positive IgG result mean?
A positive result suggests that your immune system has been exposed to the mold at some point. It does not confirm that mold is currently causing symptoms or that you have a mold-related illness. Your clinician will interpret the result along with your history and other findings.
Can this test tell me if my home has black mold?
No, this test measures antibodies in your blood, not mold in your environment. If you are concerned about mold in your home, a qualified environmental professional can inspect and test your living space. The blood test only reflects your body's immune response.
How long does it take to get results?
Typical turnaround is 1 to 3 business days after the lab receives your sample. Actual timing can vary by laboratory and shipping. Check with the collection lab for an estimated timeframe.
Do I need to avoid anything before the test?
In most cases, no special preparation is needed. However, some labs may have specific instructions, so it is best to follow the guidance provided by the collection lab. If you have questions about medications or fasting, ask your clinician or the lab.
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