Your blood draw, demystified.
You ordered. Now what? Here’s exactly what to do before, during, and after your lab visit — so you walk in confident and walk out on track.
Before
Prep at home
Fast (if needed), hydrate, take meds as usual.
At the lab
Quick draw
Walk in, hand over your requisition, ~15 min total.
After
Results in your portal
1–3 business days, physician-reviewed, no follow-up call needed.
Before you go
The 4 things that matter
Most lab tests need almost no prep. The few that do are listed in your order email — these are the universals.
Fast for 8–12 hours
Only if your test requires it (lipid panels, glucose, insulin, full metabolic panels). Water, black coffee, and prescribed medications are usually fine. Your order email lists exact prep instructions.
Morning is better for hormones
Testosterone, cortisol, and many other hormones peak in the morning. If you're testing those, aim for a draw before 10 AM.
Hydrate well
Drink 2–3 glasses of water before your visit — it makes the draw faster and easier on your veins.
Continue your medications
Unless your provider told you otherwise, take your normal meds with water. Stopping suddenly can affect results more than the meds themselves.
What to bring
Two things, that's it
No insurance card, no appointment, no doctor's note. Just these:
Required
Government-issued photo ID
Driver's license, state ID, or passport.
Your lab requisition
Either printed OR pulled up on your phone — both work. We email it to you and it lives in your patient portal under "Download requisition."
You DON’T need
An insurance card — TestWell is self-pay — no insurance needed or accepted.
An appointment — Quest, Labcorp, and BioReference all accept walk-ins for our orders. No calling ahead.
A doctor's order — Our network physicians review and approve every order before the requisition is issued — that's already done.
At the lab
The 4-step visit
Total time: 15–30 minutes door to door. The actual draw is 2–5 minutes.
Sign in at the front desk
Hand over your photo ID and pull up the requisition (printed or on phone). The tech will look it up by name and date of birth.
Wait briefly
Walk-in waits at most lab locations are 10–20 minutes. Quest and Labcorp's busiest hours are 7–9 AM (the fasting crowd) — try mid-morning or early afternoon if you can.
The draw itself
A trained phlebotomist will draw 1–4 small tubes of blood depending on your panel. The whole thing takes 2–5 minutes. If you're afraid of needles, tell the tech — they're great at this.
You're done
Cotton ball, bandage, and you're out the door. Total visit time is usually 15–30 minutes door to door.
Lab-specific notes
Quest, Labcorp, and BioReference
The walk-in process is the same everywhere — but a few details differ. Here’s what to know about whichever lab you’re routing to.
Quest Diagnostics
2,250+ locations
- No draw fee at most locations.
- Use the Quest mobile app to check estimated wait times before you go.
- Open Saturdays at most locations; some open Sundays.
Labcorp
2,000+ locations
- Some locations charge a small draw fee (~$6.82) — disclosed at checkout if applicable.
- Same walk-in policy: no appointment needed for our orders.
- Slightly more locations open Sundays in major metros.
BioReference Laboratories
NY & NJ patients only
- Required for patients in New York and New Jersey due to state regulations.
- Walk-in friendly. Smaller network than Quest/Labcorp but well-distributed across NY/NJ.
- $3 draw fee at most locations.
After your visit
What happens next
The waiting is the worst part. Here’s the actual timeline.
The lab processes your sample
Most basic panels (CBC, CMP, lipids) finish within 24 hours. Specialty tests can take 5–10 business days. Your order page shows the expected window.
We email you when results are ready
Subject line: “Your results are ready.” Click through to view the full breakdown in your patient portal.
Physician-reviewed, plain English
Every result is reviewed by a licensed physician. Critical findings get a personal call. Everything else is yours to read, share, and ask the Lab Agent about.
Your results are yours
Download as PDF, share with any doctor, or store privately. We don’t sell your data, ever.
Common questions
The stuff people actually ask
Will the lab try to charge me at the counter?
No — your TestWell order is paid in full at checkout. Quest and Labcorp see your requisition as a fully prepaid order and don't bill you again. The only exception is the disclosed Labcorp draw fee at certain locations, which we surface on the lab selector before you order.
What if I move and need to use a different lab location?
Your requisition works at any location of the lab you ordered from. Bring it to whichever Quest, Labcorp, or BioReference is convenient — same-day, next week, or up to 30 days later.
I'm afraid of needles. Any tips?
Tell the tech right when you sit down. Lab techs do hundreds of draws a week, and they have well-rehearsed tricks: looking away, breathing exercises, lying down instead of sitting, even a small ice pack. The draw itself is genuinely 30–60 seconds.
What if I forget to fast?
Don't visit the lab. Call us or reschedule yourself — fasting matters for lipid panels, glucose, A1c, insulin, and most metabolic panels. A wrong fasting status can produce misleading results that aren't useful for treatment decisions.
What if I get nauseated or lightheaded?
It happens, especially if you've been fasting. Stay seated, ask for water and a juice or snack (most labs have these), and rest 5–10 minutes before standing up.
Can I bring someone with me?
Yes — most labs allow one support person in the waiting area, and many allow them in the draw room if space permits. Especially helpful for kids, anxious patients, or anyone with mobility needs.
How long until I see results?
Most results land in your TestWell patient portal within 1–3 business days of the lab receiving your sample. A few specialty tests (vitamins, advanced lipids, certain hormones) can take 5–10 business days — your order page shows the expected window.
What if my results are abnormal?
Abnormal results are flagged in your portal with a clear explanation of what they mean. For critical findings, a licensed physician reaches out directly. You can also ask our Lab Agent any question about your results, or download a PDF to share with your own doctor.
Ready to head to the lab?
Find your nearest Quest, Labcorp, or BioReference location — or ask our Lab Agent any last question.