Home Sleep Test vs In-Lab Sleep Study — What’s the Difference?

By Yash, RRT — Licensed Respiratory Therapist & Owner, MyRespCo

If your doctor suspects sleep apnea, you’ll be referred for a sleep study. The two main options are a home sleep test (HST) or an in-lab polysomnography (PSG). Most patients don’t realize they can often choose — or that the cheaper, more convenient option is clinically appropriate for the vast majority of cases.

Home Sleep Test (HST) — What It Is

A home sleep test is a portable diagnostic device you wear at home for one or two nights. It measures your breathing patterns, blood oxygen levels, heart rate, and respiratory effort while you sleep in your own bed. The device is typically the size of a small wristwatch or pulse oximeter with a nasal cannula-type sensor.

The data is downloaded and interpreted by a sleep physician, who generates a report with your AHI score and formal sleep apnea diagnosis (or clearance).

Pros of Home Sleep Testing

  • Done in your own bed — more representative of your typical sleep environment
  • Significantly cheaper — often $99–$299 without insurance vs. $1,500–$3,000 for in-lab
  • Available through telehealth — device mailed to you, no appointment required
  • Fast results — typically 3–5 business days after returning the device
  • Widely covered by insurance when ordered by a physician

Limitations of Home Sleep Testing

  • Does not measure brain waves (EEG) — cannot diagnose other sleep disorders like narcolepsy or REM sleep behavior disorder
  • May underestimate AHI in complex cases because it cannot verify actual sleep time (it divides events by total recording time, not confirmed sleep time)
  • Not appropriate for patients with significant cardiac or pulmonary comorbidities

In-Lab Polysomnography (PSG) — What It Is

An in-lab sleep study is performed at a hospital or sleep center. You spend the night with electrodes and sensors attached throughout your body measuring brain waves, eye movements, muscle activity, heart rhythm, breathing, blood oxygen, and leg movements.

Pros of In-Lab PSG

  • Gold standard diagnostic test — measures the most complete picture of sleep architecture
  • Can diagnose complex sleep disorders beyond OSA
  • Can perform a split-night study — diagnose and titrate CPAP pressure in one night
  • More accurate AHI in complex or ambiguous cases

Limitations of In-Lab PSG

  • Expensive — typically $1,500–$3,000 without insurance
  • Long wait times — often 4–8 weeks for an appointment at a sleep center
  • Sleeping in an unfamiliar environment with wires attached can affect sleep quality and test representativeness

Which One Should You Get?

For most patients with suspected obstructive sleep apnea and no significant comorbidities, a home sleep test is the appropriate first step — and is what most sleep physicians and insurance providers now recommend as the initial diagnostic pathway.

In-lab PSG is recommended when: complex sleep disorders are suspected, the home test is inconclusive, or the patient has significant cardiopulmonary disease that complicates the interpretation of portable monitoring.

What Happens After Your Sleep Test?

If your test confirms OSA (AHI ≥5 with symptoms, or ≥15 regardless of symptoms), your physician will prescribe CPAP therapy. You’ll need a data-capable CPAP machine and ideally, guidance from a Licensed Respiratory Therapist on setup, mask selection, and pressure management.

MyRespCo’s $49.99 RT Consultation is designed for exactly this moment — right after diagnosis, before you spend hundreds of dollars on equipment you may not need, or get assigned a machine by a DME that doesn’t explain how to use it.

→ How to Get a CPAP Machine Without a Prescription
→ Book an RT Consultation — $49.99
→ What Is AHI and Do I Need CPAP?