a1c test meter, diagnosing prediabetes, hemoglobin blood test, tube with blood, medical test blood sample, test result negative

a1c test meter diagnosing prediabetes hemoglobin blood tube medical sample result negative diagnostic tool hdl cholesterol level icon high bad heart chart logo colesterol health arrow isolated concept poster medicine sign healthy diagram pictogram disease dashboard measurement scale progress gauge arteriosclerosis lipids density control measuring metering normal