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What is 'AHI' on a Sleep Apnea Test?

Of all the numbers on your sleep apnea test report, the AHI is the most important. On some sleep study reports, you will see the terms "RDI" or "REI" in place of AHI. But what does AHI mean and what's the difference between AHI, RDI, and REI?

Of the three, AHI as it is the most commonly used term and is an acronym for "apnea-hypopnea index." To understand the term, we first need to define what apneas and hypopneas are.


man having apnea in sleep

Apneas are a type of...

5 Ways to Fall in Love with Your PAP Machine

CPAP machine gift

So, you got the results of your sleep study and they say you have pretty bad sleep apnea. Now what? They want you to use a Positive Airway Pressure (PAP) device with a mask when you sleep, but you say, “No way!” You’ve probably been going along pretty well all these years without sleeping with a mask on your face, so why start now? In this blog, I propose 5 steps to have a successful relationship with your PAP.

Let's begin with a little background. Apnea comes from the Greek word apnos, meaning "without breathing." Sleep apnea is...

ICD-10 Codes for Sleep Apnea - Sleep Study CPT Codes

At Singular Sleep, many of our patients have high-deductible health plans with or without health care spending accounts (HSA) or flexible spending accounts (FSA). These patients often find that they can save a lot of money and time by using us to get a sleep apnea test, consult with our sleep doctor, and purchase CPAP and BPAP products. But folks often want to submit invoices to their insurance companies for reimbursement purposes or to count towards their deductibles. Here is some helpful information that can make it easier for you to file claims with your health care insurance company...

Does Zyppah Work or Is Jimmy Wrong?

You've seen the ads. You've heard the loud, repetitive pitches from "Zyppah Jimmy." But is the Zyppah the snoring solution that you've been searching for or just another gimmick? The money-back guarantee seems like a no-lose proposition, but are there any hidden downsides to trying the Zyppah? Here is Dr. Krainin's in-depth analysis and review of this popular snoring aid.

zyppah snoring device

What is Zyppah and what sets it apart from other snoring appliances on the market?

The Zyppah (pronounced "ZEE -pa") Stop Snoring Hybrid Oral Appliance entered the already-crowded snoring...

Is My Sleep Apnea Treatment Working? The Seven Deadly Signs  

"I use my CPAP machine every night, so I don't have to worry about sleep apnea anymore, right?"


This is a common and widely held misconception. Sleep apnea treatment is one of those cases in life when "you don't know what you don't know." Since you're asleep, you're completely unable to assess how well the apnea is being treated. Don't fool yourself: even though you use CPAP all night and feel good during the day, your body still may be suffering at night. Treating sleep apnea is definitely not a "one size fits...

Can Sleep Apnea Cause High Blood Pressure?

Get the most up to date information about the sleep apnea and blood pressure connection from a sleep doctor's perspective.

Sleep Apnea and Blood Pressure: the Whole Story

Are sleep apnea and blood pressure related? Can obstructive sleep apnea cause hypertension? Does blood pressure improve with the use of a CPAP machine? Read on to find the answers to these questions and more.

In order to explain the high blood pressure and sleep apnea connection, let's first define a few key concepts.

sleep apnea and blood pressure connection

Mild Obstructive Sleep Apnea: When Is Treatment Recommended?

Should Mild Sleep Apnea BeTreated?

thinking about mild sleep apnea

In this article, I will unpack the scientific evidence informing both sides of the debate about how mild sleep apnea should be managed. To start, let's clarify some key concepts.

What Is Mild Sleep Apnea?

In adult patients (≥ 18 years of age), mild sleep apnea is defined as a sleep apnea test showing an apnea hypopnea index (AHI)  between 5 and 15. AHI is synonymous with RDI (respiratory disturbance index) or REI (respiratory event index - more commonly used on a...

Is a sleep apnea test really necessary or should I just get an auto-CPAP machine?

Not infrequently, people ask me some variation of the following:

I'm told that I snore every night, and a few times my spouse has heard me stop breathing in my sleep. I've done some research online and I'm pretty sure that I have sleep apnea. Do I really need to do a sleep apnea test or is this just an added expense? Why not just buy an auto-CPAP machine?

In this article I'm going to unpack the rationale behind having a sleep apnea study so that you can fully understand your options. In order to honestly address...

How Do Pets Affect Our Sleep?

pets and sleep survey
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Travel CPAP Machine Reviews

This article is a comprehensive review of all the available mini CPAP machines on the market by our board-certified sleep physician.

Mini CPAP: A Guide to Portable CPAP Machines

plane train and car symbols

Are you in the market for a CPAP that can fit in the palm of your hand? CPAP users in one of the following categories might benefit from a travel-sized machine in addition to their standard CPAP machine:

  • frequent travelers
  • hunters
  • backcountry campers
  • sailors
  • vacation homeowners who don't want to lug their regular machines back and forth between homes
  • those who don't want everyone...