Pacific · TSH Blood Test - Thyroid-Stimulating Hormone Test
TSH Blood Test - Thyroid-Stimulating Hormone Test in California
This page explains the tsh blood test - thyroid-stimulating hormone test, what it measures, and how to order it. The TSH blood test measures thyroid-stimulating hormone to help evaluate thyroid function and screen for related disorders.
Lab requirements in California
Here is what you need before ordering and completing the TSH Blood Test - Thyroid-Stimulating Hormone Test in CA. 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 instructions can vary, so follow the specific instructions provided by the collection laboratory. In some cases, no special preparation is needed, but always confirm with the…
- 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
The thyroid-stimulating hormone (TSH) blood test measures the level of TSH, a hormone produced by the pituitary gland that regulates thyroid activity. It is commonly used to assess thyroid function and help detect conditions such as hypothyroidism or hyperthyroidism.
What it measures
- Thyroid-Stimulating Hormone (TSH) — Reflects the level of TSH in the blood, which helps indicate how well the thyroid is functioning.
What the test involves
The test involves a standard blood draw, usually from a vein in your arm. A small sample of blood is collected into a tube and sent to a laboratory for analysis.
Why it is often ordered
A clinician may order a TSH test to evaluate symptoms that could be related to an overactive or underactive thyroid, or to monitor thyroid function in people with known thyroid conditions. It is also sometimes included in routine health screenings.
Preparation
Preparation instructions can vary, so follow the specific instructions provided by the collection laboratory. In some cases, no special preparation is needed, but always confirm with the lab before your appointment.
How results are reported
Results are typically reported as a numeric value along with a reference range. Reference ranges can vary between laboratories, so your results should be interpreted in the context of the range provided by the testing lab.
Before you go
- Whether any preparation, such as fasting, is required
- If you should take your medications as usual before the test
- The expected turnaround time for results
Cities
TSH Blood Test - Thyroid-Stimulating Hormone Test in California communities
Choose your city for local context and to order this test.