Oleg Kainara
Visionary entrepreneur driving innovation at the intersection of healthcare, AI and global diagnostics. Author of the Previva methodologies. He has worked for many years in preventive medicine, longevity and early detection of disease. He writes from his own experience and vision.
Articles
HOMA-IR: what it is, how it is calculated and what the result means
What the HOMA-IR index is, how it is calculated from fasting glucose and insulin, why there is no single cut-off and which data give the result meaning.
Thyroid panel: TSH, free T4 and T3, what each one measures and why «normal» is not always normal
What TSH, free T4 and T3 measure, which combinations your doctor describes, what moves TSH without disease and why it is worth repeating before concluding.
Annual preventive check-up: what to include by age and sex, and what not to repeat every year
Which tests a preventive check-up includes by age and sex per the USPSTF and Mexico’s health card, what not to repeat yearly and what to bring to the doctor.
Heart rate variability (HRV): what it is, values by age and why it changes so much
What heart rate variability measures, an HRV table by age and sex, what lowers it (alcohol, sleep, illness, training) and how to read your own.
High diastolic blood pressure: what the bottom number means and what to do when it rises alone
What a high diastolic with a normal systolic means, where your number falls under the guidelines, what raises it and what to record before consulting.
Not losing weight despite doing everything right: what to measure and test
Why you are not losing weight despite doing everything right: how to measure the real trend in four weeks, what may hold it back and which tests to ask for.
High fasting glucose: what it means, what prediabetes is and what to record at home
A high fasting glucose is not a diagnosis. What pushes it up on a single day, which categories guidelines use, what prediabetes is and what to record at home.
High uric acid: what it means, what raises it and when to worry
High uric acid without symptoms is not gout. What urate is, the 6.8 mg/dL point, what raises it (beer, soft drinks, diuretics) and what to take to the doctor.
Normal blood pressure: the table, what changes with age and how to measure it at home
What normal blood pressure is according to the guidelines, why the table by age does not exist, how to measure it properly at home for seven days and when to consult.
Complete blood count: what it includes and how to read each line
What each line of the complete blood count measures: red series, white series and platelets, which are read together, why ranges change and what it leaves out.
Blood chemistry panels of 6, 12, 24 and 35 markers: what each includes and which to order
The Mexican “blood chemistry of 6, 12, 24 or 35 elements” is not a medical standard. Which blocks each version carries, what each answers and which to order.
Normal resting heart rate by age: table and what it means when it changes
Normal resting heart rate by age in a table, why your usual level matters more than the table, what raises or lowers it, how to measure it and when to consult.
High cholesterol: what it means, when to worry and what to ask for
You searched for high cholesterol symptoms and there are none. What LDL, HDL and non-HDL mean, which thresholds guidelines use and what to bring to your doctor.
High triglycerides: what the number means and what to check before repeating the test
High triglycerides in your results: what each band means, why they change with dinner and alcohol, and what to check before repeating the test.
High creatinine: what it means, what raises it without the kidney, and what to ask for
Your creatinine came out high on a blood test. What raises it without the kidney being involved, what eGFR is, why it is repeated in three months and what to ask for.
Brain fog: what it is, which causes can be measured and which tests to ask for
You think slowly, words slip away, you cannot focus. Which part of brain fog is measured at home, which blood test makes sense to ask for and when not to wait.
Tingling in hands and feet: causes, which tests to ask for and when not to wait
Tingling in hands and feet: why the pattern (where, when, with what) says more than a random blood test, which tests are considered and when not to wait.
Sleepy after meals and craving sugar: glucose, insulin and the pattern almost nobody measures
Sleepiness after meals, sugar cravings and the afternoon crash: what is normal, what points to glucose and insulin, which tests measure it and how to log it at home.
Fatigue: causes and which tests to ask for
You have been tired for months and the blood tests you had came back normal. Which tests are usually checked first, what they tend to show and how to log your fatigue so the appointment is useful.
Frequent headaches: causes, what to measure at home and when to worry
Your head hurts several times a month and the blood test came back normal. Why it almost never shows in the blood, what you can measure at home (days with pain, blood pressure, sleep, caffeine, cycle) and which signs cannot wait.
Hair loss: causes and which tests to ask for
You are losing more hair than usual and do not know whether to ask for a blood test, see a dermatologist or wait. The three tests usually checked (ferritin, TSH, blood count), the timeline that explains most cases and how to log it.
Why the laboratory reference range is not your personal norm
The lab range describes a population, not you. What those numbers in brackets actually mean and how to read them alongside your own history.
What biological age is and how it is calculated
Biological age estimates how your body is working, not how long you have left. What PhenoAge measures, which nine blood markers it uses, and how to read the result without over-reading it.
How to read your lab results without panicking
A flagged value is not a diagnosis. What moves your results when nothing is wrong, why something almost always comes back out of range, and how to read your report in five steps.