US Medical Tests Guide: Labs, Imaging, and Avoiding Surprise Bills

Blood Work: Quest and Labcorp

The two national lab giants are Quest Diagnostics and Labcorp. The typical flow:

1. Your doctor creates a lab order (requisition) — often sent electronically.
2. You visit any Quest/Labcorp patient service center (or an in-office draw station). No appointment is usually needed; mornings are best if fasting is required.
3. Results go to your doctor, and usually appear in your patient portal within 1–3 days.

Fasting: many panels (cholesterol, glucose) require 8–12 hours of fasting — water is fine, coffee is not.

Direct-to-consumer labs: you can also order many tests yourself without a doctor (Quest, Labcorp Link, Ulta Lab Tests). Useful for routine monitoring, but results without a doctor's interpretation can be misleading — and your insurer will not pay for self-ordered tests.

Imaging: X-Ray, Ultrasound, MRI, CT

• X-ray: often available same-day at urgent care centers and radiology offices; usually no prior authorization needed.
• Ultrasound: scheduled at imaging centers; may need prior authorization.
• MRI/CT: almost always require prior authorization from your insurer, and waits of days to weeks are normal. Your doctor's office usually handles the authorization — confirm it is approved before you show up, or you may owe the full charge.
• Where you get imaged matters: hospital outpatient departments typically bill far more than independent imaging centers for the same scan. Ask your doctor for options and compare.

The Out-of-Network Radiologist Trap

A classic US surprise bill: you have surgery or an ER visit at an in-network hospital, but the radiologist or anesthesiologist who reads your scan is out-of-network — and bills you separately. The No Surprises Act now bans this for emergency care and most care at in-network facilities: you owe only your normal in-network cost-sharing. If such a bill arrives anyway, dispute it — do not just pay.

How to Keep Test Costs Down

• Ask for the price first. For non-urgent tests, call the facility and ask for the self-pay or cash price — it is often far lower than the insured billed rate.
• Stay in-network for labs and imaging centers, not just the ordering doctor.
• Use preventive coverage: many screenings (mammograms, colonoscopies by age, cholesterol checks) are free in-network under the ACA when coded as preventive.
• Get copies of everything. Imaging on a CD or portal download avoids paying for a repeat scan when you switch doctors.

Reading Your Results in Patient Portals

Most labs and hospitals now release results directly to patient portals, sometimes before your doctor has reviewed them. Seeing an abnormal value flagged in red is alarming but often not urgent — reference ranges are population averages, and mildly out-of-range results are common. Do not Google in a panic; message your doctor through the portal for interpretation. Under federal information-blocking rules, providers cannot withhold your results, though some still delay release by a few days. Download and keep copies of important results — especially imaging — so you never pay twice when switching doctors.

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