Evidence-based articles about understanding your health data, what biomarkers mean, and how to prepare for doctor visits.
Gout is caused by high uric acid — but that same marker is a red flag for insulin resistance and metabolic syndrome. Here's what your uric acid level really tells you.
A high TSH almost always means your thyroid is underactive — but the reason behind it varies. Here are the common causes of an elevated TSH, from Hashimoto's to medications.
Normally a high TSH comes with a low T4. When both are elevated, it's an unusual pattern that points to specific causes — here's what high TSH with high T4 can mean.
A high TSH signals an underactive thyroid, which slows the whole body down. Here are the common symptoms of high TSH — and why many people have none at all.
Chronic kidney disease affects about 1 in 7 US adults — and roughly 90% don't know they have it. Here are the two blood and urine markers that catch it early.
PCOS affects up to 1 in 8 women — and up to 70% don't know they have it. Insulin resistance is central to it. Here are the blood markers that reveal the connection.
That 3pm wall where focus and energy collapse is often a blood-sugar swing — and sometimes an early sign of insulin resistance. Here's the biology and what to check.
Always-cold hands and feet can be nothing — or a clue pointing to low iron, an underactive thyroid, or circulation issues. Here's what to check in your blood.
Fatty liver disease now affects roughly a third of adults worldwide — usually with no symptoms. Here's how it shows up in routine blood work and what to check.
Metabolic syndrome is a cluster of five findings that together sharply raise heart and diabetes risk — and about 1 in 3 US adults has it. Here are the exact criteria.
Prediabetes isn't a one-way road to diabetes. A landmark trial cut progression by 58% with lifestyle changes alone. Here's what works — and the markers to track.
TPO antibodies reveal the most common cause of an underactive thyroid — Hashimoto's — often before TSH goes clearly abnormal. Here's what the test means and when to ask for it.
Whether you're managing prediabetes or just watching your metabolic health, the right app turns scattered glucose and HbA1c results into a trend. Here are the best options.
Your cholesterol is more than one number — LDL, HDL, triglycerides, ApoB, and the ratios between them. Here are the best apps to track your full lipid panel over time.
C-reactive protein measures inflammation — and high-sensitivity CRP is one of the better predictors of cardiovascular risk. Here's what the numbers mean and how to read them.
TSH is the usual thyroid screening test — but it's only the brain's signal. Free T4 and Free T3 measure the actual hormones. Here's what each adds to the picture.
Sudden or diffuse hair shedding often has a testable cause in your blood — iron, thyroid, vitamin D, and more. Here's what to check before blaming genetics.
InsideTracker pairs blood testing with diet and supplement recommendations — at a premium price. Here are the alternatives, and how to choose based on what you need.
Function Health sells a yearly panel of 100+ tests. Bevita reads the labs you already get. Here's how the two differ — and which makes sense for your situation and budget.
Constant sugar cravings aren't just willpower — they're often a signal of blood-sugar swings and early insulin resistance. Here's the biology and the markers to check.
Vitamin D deficiency is one of the most common — and most missed — deficiencies worldwide. Here are the signs, the one blood test that catches it, and what the numbers mean.
Total cholesterol, LDL, HDL, triglycerides, non-HDL — your lipid panel has five-plus numbers and most people only hear one. Here's what each actually tells you.
Ornament is one of the better-known apps for tracking blood test results. Here's an honest look at what it does well, where it falls short, and the alternatives worth considering.
When the scale climbs despite no real change in diet or activity, the answer is often metabolic — and testable. Here are the blood markers behind unexplained weight gain.
Apple Health holds your steps, heart rate, and sleep — but what about your blood test results? Here's where it falls short for labs, and what a dedicated tracker adds.
Brain fog isn't a diagnosis — it's a symptom. And several common, testable blood markers sit behind most cases. Here's what to check when your head feels cloudy.
Fasting insulin rises years before glucose does — making it the earliest warning of metabolic trouble. So why is it almost never ordered? Here's what it is and why to ask.
Persistent fatigue is one of the most common reasons people see a doctor — and one of the most under-investigated. Here are the 6 blood markers that explain most cases.
HbA1c is the single most useful blood sugar marker — it averages the last 3 months. Here's what the numbers mean, why 'normal' can still be a warning, and how to track it.
Insulin resistance can build for years before it shows up as prediabetes. Here's how to spot the early signs, which blood markers reveal it, and how to track HOMA-IR over time.
Your lab says your ferritin is 'normal' at 25. But research suggests you might still be deficient. Here's the real chart.
TSH is one of the most common blood test abnormalities. But what does it mean when your TSH is high — and when should you worry?
Your lab report has dozens of numbers. Most are normal. Some need attention. Here's a plain-English guide to understanding what each section means.
From basic lab trackers to AI-powered health records, here are the best apps for understanding your blood test results — and what each one actually does.
Some health apps remember your data forever. Others forget it the moment you close the tab. Here's how to tell which is which.
ChatGPT is great for one-off health questions. But what happens next month, when you need to compare?
You've tracked your labs for months. But can you share that with your doctor? Most apps say no.
Bevel and Bevita both call themselves AI health apps. But one is built around wearable data, the other around your actual lab results. Here's how they differ.
Ferritin is one of the most commonly tested biomarkers, yet many people don't understand what their results really indicate. A guide to interpreting ferritin levels.