Health tool map
Health screening
Clinical scores, lab measures, and screening calculations.
Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.
Latest update:
Screening tools organize clinical measures — readings, scores, and lab-style calculations — into educational context. The blood pressure calculator places a systolic and diastolic reading into common adult categories, and the blood sugar calculator converts glucose between mg/dL and mmol/L with timing-based educational labels. Structured scoring pages like the 4Ts score calculator sum clinical domains into pretest-probability bands, while the ankle-brachial index calculator compares arm and ankle pressures. These pages are informational: a single calculation cannot diagnose a condition, and repeated, properly measured readings plus clinical context change interpretation. Related body and measurement tools live in the Health collection.
9 of 9 calculators
Health screening9 calculators
2020 Vision Calculator
Review lifestyle inputs linked with eye health education, see the exact activity, diet, and smoking score logic, and learn the limits of this vision risk flag.
Updated
Verified
4Ts Score Calculator
Estimate 4Ts pretest probability for heparin-induced thrombocytopenia by summing thrombocytopenia, timing, thrombosis, and other-cause scores.
Updated
Verified
6 Minute Walk Test Calculator
Compare six-minute walk distance with sex-specific predicted values, lower limits, and percentage expected using the standard 6-minute walk distance equation.
Updated
Verified
Acid Base Calculator
Interpret pH, PCO2, bicarbonate, sodium, chloride, and albumin for educational acid-base pattern review, including anion gap and albumin correction.
Updated
Verified
Ankle-Brachial Index (ABI) Calculator
Calculate ankle-brachial index from arm and ankle systolic pressures, with lower-ABI interpretation, PAD context, limitations, and medical disclaimer.
Updated
Verified
Blood Pressure Calculator
Categorize an adult blood pressure reading from systolic and diastolic values, using the exact threshold logic in the calculator and clinical cautions.
Updated
Verified
Blood Sugar Calculator
Convert blood glucose between mg/dL and mmol/L, see the exact conversion factor, and compare readings with educational ADA-style categories.
Updated
Verified
Drug Half Life Calculator (Remaining Concentration)
Estimate remaining drug concentration from initial amount, half-life, and elapsed time using exponential decay, with pharmacokinetic cautions.
Updated
Verified
Noise Exposure Calculator (OSHA or NIOSH Dose)
Calculate occupational noise exposure dose under one selected OSHA or NIOSH criterion while keeping their assumptions separate.
Updated
Verified
2020 Vision Calculator
Review lifestyle inputs linked with eye health education, see the exact activity, diet, and smoking score logic, and learn the limits of this vision risk flag.
Updated
Verified
4Ts Score Calculator
Estimate 4Ts pretest probability for heparin-induced thrombocytopenia by summing thrombocytopenia, timing, thrombosis, and other-cause scores.
Updated
Verified
6 Minute Walk Test Calculator
Compare six-minute walk distance with sex-specific predicted values, lower limits, and percentage expected using the standard 6-minute walk distance equation.
Updated
Verified
Acid Base Calculator
Interpret pH, PCO2, bicarbonate, sodium, chloride, and albumin for educational acid-base pattern review, including anion gap and albumin correction.
Updated
Verified
Ankle-Brachial Index (ABI) Calculator
Calculate ankle-brachial index from arm and ankle systolic pressures, with lower-ABI interpretation, PAD context, limitations, and medical disclaimer.
Updated
Verified
Blood Pressure Calculator
Categorize an adult blood pressure reading from systolic and diastolic values, using the exact threshold logic in the calculator and clinical cautions.
Updated
Verified
Blood Sugar Calculator
Convert blood glucose between mg/dL and mmol/L, see the exact conversion factor, and compare readings with educational ADA-style categories.
Updated
Verified
Drug Half Life Calculator (Remaining Concentration)
Estimate remaining drug concentration from initial amount, half-life, and elapsed time using exponential decay, with pharmacokinetic cautions.
Updated
Verified
Noise Exposure Calculator (OSHA or NIOSH Dose)
Calculate occupational noise exposure dose under one selected OSHA or NIOSH criterion while keeping their assumptions separate.
Updated
Verified
Frequently asked questions
- Does this calculator test whether I have 20/20 vision?
- No. Despite the name, it does not measure visual acuity, refractive error, eye pressure, retina health, cataracts, glaucoma, or macular degeneration. It only scores lifestyle inputs and returns a low or increased lifestyle risk flag for education and reflection only.
- What inputs affect the result?
- The calculation adds four activity selections and seven diet selections, then checks whether smoking status is heavy. It returns an increased flag when activity totals 8 or less, diet totals 23 or less, or heavy smoking is selected. These cutoffs are an unvalidated heuristic, not an eye-disease risk model.
- Can a low flag prove my eyes are healthy?
- No. A low lifestyle flag does not replace a comprehensive eye exam and does not rule out eye disease. Many eye conditions can be silent early, and sudden symptoms need professional evaluation regardless of a lifestyle score or online tool.