General Wellness
Preparing for a Occult Blood Fecal Test
- Stool sample
- General Wellness
- Prep checklist included
At a glance
Occult Blood Fecal Test: prep snapshot
- Sample type
- Stool sample
- Fasting
- Fasting is generally not required for this stool test, though some labs may give specific…
- Best collection time
- Collect the sample from a fresh bowel movement, ideally on the day the kit instructions…
- Typical turnaround
- Varies by collection lab
- Category
- General Wellness
A Occult Blood Fecal Test is usually quick, and most of the work is in the preparation: timing, fasting, and a short checklist. The occult blood fecal test, also called a FIT or iFOBT, checks a stool sample for hidden blood that you cannot see.
What the Occult Blood Fecal Test measures
The test measures whether hemoglobin from the lower digestive tract is present in a stool sample. It does not measure cholesterol, hormones, or nutritional markers. A positive result only indicates that blood was detected and does not by itself identify a cause.
- Fecal hemoglobin
- Occult blood presence
- Lower digestive tract bleeding signal
- Screening status
Preparation checklist for the Occult Blood Fecal Test
Most people need no special preparation beyond following the collection kit instructions. Ask the testing location whether any timing, diet, or medication instructions apply to your kit.
- Read the collection kit instructions fully before you begin.
- Collect the sample from a bowel movement, avoiding urine or toilet water contact.
- Use only the collection device and labeled container supplied with the kit.
- Label the sample with your name and the collection date and time.
- Return or ship the sample as directed within the timeframe the lab specifies.
- Check with the lab about any medicines, supplements, or foods they want you to pause before collecting.
Fasting, timing, sample type, and what to bring
Fasting
Fasting is generally not required for this stool test, though some labs may give specific instructions. Because guidance varies, confirm with your lab.
Best time to collect
Collect the sample from a fresh bowel movement, ideally on the day the kit instructions indicate, and return it promptly. Some kits ask for samples from more than one bowel movement, so follow the schedule included with your kit.
Sample type
Stool sample. The collector will explain the process before starting.
What to bring
- Your order confirmation email, in case the collection site asks to see it
- Your printed lab order or requisition form — the ordering physician prepares it for you after you order, and you print it (or fax it from your account) before visiting
- A short-sleeved or loose-sleeved shirt for an easy blood draw
- Water to drink before the draw and a light snack for afterward, if your test requires fasting
- A government-issued photo ID (most collection sites verify identity at check-in)
- A written list of the medications and supplements you currently take
You do not need an insurance card or a payment method at the collection site: the lab does not bill insurance, and you pay at order time, so there is no copay or deductible. The lab also provides the physician's requisition, so you do not need a separate doctor's referral.
Order process and what-to-bring details reflect the lab's published instructions, paraphrased in our own words. Confirm final requirements with the collection lab that will perform your draw.
What the collection involves
You collect a small stool sample at home using the kit's collection device, following the written steps. The sample is then returned to the lab, where it is processed and analyzed for hidden blood.
Details worth confirming with the collection lab before your visit:
- Does my kit require any diet or medication changes before collection?
- How many separate stool samples do I need to provide and on which days?
- What is the deadline for returning my sample to the lab?
Why a clinician may order this test
A clinician may order this test to screen for hidden bleeding in the digestive tract as part of routine colorectal screening. It may also be used to help investigate unexplained anemia or other digestive symptoms.
Reading your results responsibly
Reference ranges and reporting formats vary by laboratory, so your report may look different from another lab's. Your clinician will interpret your result alongside your history and any other testing.
General test information is compiled from publicly available reference material, including MedlinePlus (medlineplus.gov) and the Centers for Disease Control and Prevention (cdc.gov), and is reviewed for clarity. Preparation and what-to-bring details reflect the lab's published instructions, paraphrased into our own words. Preparation instructions, timing, and pricing vary by collection lab — always confirm them with the lab that will perform your draw.
Common questions
Frequently asked questions
Does this test require fasting?
Fasting is usually not needed for a stool-based occult blood test. Check with your testing location, since it may have specific instructions for your kit.
Can I collect the sample at home?
Yes, most kits are designed for at-home collection. Follow the written instructions and return the sample within the timeframe the lab specifies.
What does a positive result mean?
A positive result means blood was detected in the sample. It does not identify a cause, so your clinician will decide whether follow-up testing is needed.
How long do results take?
Results are typically available within one to three business days after the lab receives your sample. Actual timing can vary by laboratory.