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For adults, serum vitamin B12 is generally adequate above 300 pg/mL; 200–300 is borderline and needs follow-up testing for deficiency.

Most adults meet daily hydration with total water of 3.7 liters for men and 2.7 liters for women, counting all drinks and foods.

On a home blood pressure monitor, a normal resting pulse for healthy adults usually reads 60–100 beats per minute.

Most adults meet daily hydration when total water reaches about 3.7 L for men and 2.7 L for women, counting all drinks and food water.

A healthy body water percentage typically sits around 50–65% in men and 45–60% in women, trending higher in leaner and younger bodies.

For most adults, vitamin D levels are adequate at ≥20 ng/mL (50 nmol/L); many clinicians target 20–50 ng/mL based on health needs.

For pulse oximeter pulse reading, a normal adult resting rate is 60–100 beats per minute; kids run higher based on age.

Normal uric acid level is about 3.5–7.2 mg/dL in men and 2.6–6.0 mg/dL in women; targets drop below 6 mg/dL if gout is present.

A typical adult sees a 10–20 bpm rise in heart rate on standing; a jump ≥30 bpm within 10 minutes may signal POTS and merits medical review.

A healthy heart rate variability is a personal baseline where HRV trends stay stable or rise with rest and fitness, not one fixed number for everyone.