AQT90 FLEX NTproBNP (N-terminal Pro-brain Natriuretic Peptide) 2 Test Kit - Reference Interval Study Protocol - China

Inclusion Criteria: Subjects who meet all the following criteria are eligible for inclusion: 1. Voluntarily participate in this study and sign informed consent; 2. Body Mass Index (BMI) ≥18.5 and \<28kg/ m2; 3. Age ≥18 years old; 4. Through the investigator's consultation with the subjects, evaluate the subjects who meet the requirements of the reference individual of this study (refer to the "reference individual questionnaire"). Exclusion Criteria: Subjects who meet any of the following criteria will be excluded: 1. Physical examination, laboratory test/examination results meet any of the following: * eGFR(estimated glomerular filtration rate) (formula: CKD-EPI, chronic kidney disease epidemiology collaboration) \< 60 mL/min/1.732 * Systolic blood pressure ≥130 mm Hg and/or diastolic blood pressure ≥80 mmHg * Glycated hemoglobin A1c (HbA1c) ≥ 6.0%; or fasting blood glucose ≥ 7.0 mmol/L * Total cholesterol ≥ 6.22 mmol/L and/or triglycerides ≥ 2.26 mmol/L * High-sensitivity troponin: Female: ≥15.6 pg/mL (ng/L), Male: ≥34.2 pg/mL (ng/L) * Electrocardiogram, with obvious abnormalities such as those that may cause cardiac structural changes or risk factors for arrhythmia as assessed by the investigator 2. Subjects who are unable to provide a sufficient volume (≈2 mL) of EDTAanticoagulated whole blood sample; 3. Subjects who withdraw informed consent; 4. Subjects assessed by the investigator as unsuitable for inclusion in this study.