Apple Watch's calorie counts can be accurate within 18-40%—if you follow these steps.
Apple Watch's calorie estimates use GPS, accelerometer, heart rate, and barometer
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Less than 1% of the U.S. gets the best lab test to predict heart disease
• Harish Kilaru
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Apple Watch can't predict a heart attack—these blood tests can
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How to predict your heart attack risk with <$180 of blood tests
• Brandon Ballinger
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Am I Healthy? How to design a comprehensive health score
• Raquel Rodriguez Martinez, MD, MPP
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Apple Watch's heart rate monitor is accurate to 5bpm 89-98% of the time
• Brandon Ballinger
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Empirical Health Radar: One number, infinite insights.
• Raquel Rodriguez Martinez, MD, MPP and Harish Kilaru
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Apple Watch's heart rate monitor tracks 10 metrics. What they are and why they matter.
• Brandon Ballinger
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Empirical Health launches today on Android, WearOS, and Fitbit
• Wyatt Chang and Brandon Ballinger
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Which health metrics are available on Samsung, Pixel, Apple Watch, and Fitbit?
• Brandon Ballinger
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How to Do a "Poor Man's Tilt Table Test" on Your Apple Watch
• James Russo
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How Apple Watch uses deep learning to estimate VO2Max
• Brandon Ballinger
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Breathing Disturbances on Apple Watch: What should I do if I get a “possible sleep apnea” alert from my Apple Watch?
• Raquel Rodriguez Martinez, MD, MPP
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How Apple Watch estimates VO2Max to 1.2 ml/kg/min without a treadmill test
• Brandon Ballinger
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The average Apple Watch user gets 49 minutes of deep sleep per night
• Brandon Ballinger
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How to track your mental health with PHQ-9 and GAD-7
• James Russo and Raquel Rodriguez Martinez, MD, MPP
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How Apple Watch detects 89% of severe sleep apnea
• Brandon Ballinger
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Summarize all your Apple Watch vitals into a health report
• Wyatt Chang
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Can Apple Watch track blood pressure? Not yet—but here's how the science would work.
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Empirical 2.0: your personal healthcare assistant
• Brandon Ballinger and Raquel Rodriguez Martinez, MD, MPP
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Cardiovascular metrics predict sleep apnea risk
• Brandon Ballinger
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How to correlate your health metrics with symptoms
• Brandon Ballinger
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How to do the CHOP protocol for POTS on your Apple Watch
• Brandon Ballinger
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Empirical Health is launching to 47 million midwesterners
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Can my Apple Watch tell me if I have afib?
• Raquel Rodriguez Martinez, MD, MPP
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The CHOP protocol and the science behind it
• Raquel Rodriguez Martinez, MD, MPP
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The best Apple Watch for heart monitoring (2025)
• Brandon Ballinger
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The connection between long COVID and POTS
• Raquel Rodriguez Martinez, MD, MPP
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What are some of the most common POTS triggers?
• Raquel Rodriguez Martinez, MD, MPP
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Do I need a tilt table test to confirm a POTS diagnosis?
• Raquel Rodriguez Martinez, MD, MPP
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Is the Apple Watch's oxygen sensor accurate?
• Brandon Ballinger
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Sleep apnea and the link to cardiovascular health: what you need to know
• Raquel Rodriguez Martinez, MD, MPP
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How far is 10,000 steps?
• Raquel Rodriguez Martinez, MD, MPP
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My Apple Watch says I have low blood oxygen while sleeping.
• Raquel Rodriguez Martinez, MD, MPP
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What are the steps to get a POTS diagnosis?
• Raquel Rodriguez Martinez, MD, MPP
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Why is it so hard to find a primary care doctor near me?
• Raquel Rodriguez Martinez, MD, MPP
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Empirical Health: proactive primary care that scales
• Brandon Ballinger
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What is HRV and what does it have to do with health?
• Raquel Rodriguez Martinez, MD, MPP
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How to show sleep stages on your Apple Watch face
• Brandon Ballinger
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Want better sleep quality? The top 3 factors, according to Apple Watch data
• Brandon Ballinger
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Is my data normal? Introducing Empirical Checkups
• Brandon Ballinger
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Empirical Sleep for watchOS 9
• Brandon Ballinger
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Apple Watch's new temperature sensor
• Brandon Ballinger
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Empirical Sleep for Apple Watch
• Brandon Ballinger