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What Blood Tests Need Fasting Preparation?
Blood tests are done to check for pregnancy, diabetes, cholesterol and vitamin and mineral problems. Most blood tests do not need any preparation. For those that do, make sure the instructions given by the physician are clear. If there are any questions, be sure to get the answers before testing day.
Glucose Tolerance
The glucose tolerance test, also known as the oral glucose tolerance test (OGTT), will check how the body metabolizes blood sugar. People with untreated type 2 diabetes will have high blood glucose levels. During pregnancy, high blood glucose levels can signal gestational diabetes. Fasting for this blood test is done to get an accurate reading of blood sugar levels. Ask the physician about any medications being taken and whether they will interfere with test results.
- The glucose tolerance test, also known as the oral glucose tolerance test (OGTT), will check how the body metabolizes blood sugar.
- During pregnancy, high blood glucose levels can signal gestational diabetes.
Cholesterol Levels
Differences in a CMP and a BMP
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This blood test is also called a coronary risk profile. The blood is analyzed to check the levels of triglycerides, low density lipoprotein (LDL) cholesterol, high density lipoprotein (HDL) cholesterol, very low density lipoprotein (serum VLDL) cholesterol and total cholesterol values. Fasting before this test ensures the results are accurate.
- This blood test is also called a coronary risk profile.
- The blood is analyzed to check the levels of triglycerides, low density lipoprotein (LDL) cholesterol, high density lipoprotein (HDL) cholesterol, very low density lipoprotein (serum VLDL) cholesterol and total cholesterol values.
Basic Metabolic Panel
The basic metabolic panel (BMP) blood test is usually ordered as part of a routine physical or to aid in diagnosing a specific medical problem. To get the most accurate results, fasting is a requirement. This test checks for glucose blood levels that could indicate diabetes or low blood sugar called hypoglycemia. Calcium is an important mineral in the body, and an imbalance could indicate problems in the kidneys, bones or pancreas.
It also measures the levels of blood urea nitrogen (BUN) and creatinine, which are waste products and filtered out of the blood by the kidneys. High levels could indicate the kidneys are not functioning properly.
- The basic metabolic panel (BMP) blood test is usually ordered as part of a routine physical or to aid in diagnosing a specific medical problem.
- Calcium is an important mineral in the body, and an imbalance could indicate problems in the kidneys, bones or pancreas.
Comprehensive Metabolic Panel
What Is a Standard Blood Test?
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A comprehensive metabolic panel (CMP) is a blood test that can help diagnose liver disease, diabetes and kidney disease, as well as imbalances in protein and electrolyte levels. The difference between the basic and the comprehensive metabolic panels is two extra tests are done. One checks liver function by measuring albumin, a major protein in the blood produced by the liver, and total blood protein. The other measures alkaline phosphatase (ALP), alanine aminotransferase (ALT), aspartate aminotransferase (AST) and bilirubin. High levels of any of these could indicate the liver is not functioning correctly.
- A comprehensive metabolic panel (CMP) is a blood test that can help diagnose liver disease, diabetes and kidney disease, as well as imbalances in protein and electrolyte levels.
- One checks liver function by measuring albumin, a major protein in the blood produced by the liver, and total blood protein.
Significance
Follow instructions given by the physician or lab where the blood tests will be done 1. If there was a problem following the instructions, notify the technician who is to take the blood immediately.
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References
- Lab Tests Online
- American Heart Association
- American Diabetes Association. 2. Classification and Diagnosis of Diabetes: Standards of Medical Care in Diabetes—2020. Diabetes Care. 2020;43(Suppl 1):S14-S31. doi:10.2337/dc20-S002
- American Diabetes Association. Hypoglycemia (low blood sugar).
- American Diabetes Association. Diabetes overview: Diagnosis.
- National Institute of Diabetes and Digestive and Kidney Diseases. Diabetes and prediabetes tests. Updated April 2014.
- American Diabetes Association. 6. Glycemic Targets: Standards of Medical Care in Diabetes—2020. Diabetes Care. 2020;43(Suppl 1):S66-S76. doi:10.2337/dc20-S006
- American Diabetes Association. Diabetes overview: Diagnosis.
- National Institute of Diabetes and Digestive and Kidney Diseases. Cushing's syndrome. Updated May 2018.
- Hyperglycemia and Adverse Pregnancy Outcome (HAPO) Study Cooperative Research Group. Hyperglycemia and Adverse Pregnancy Outcome (HAPO) study: preeclampsia. Am J Obstet Gynecol. 2010;202(3):255.e1-7. doi:10.1016/j.ajog.2010.01.024
- Kikuta K, Masamune A, Shimosegawa T. Impaired glucose tolerance in acute pancreatitis. World J Gastroenterol. 2015;21(24):7367-74. doi:10.3748/wjg.v21.i24.7367
- Wernly B, Lichtenauer M, Hoppe UC, Jung C. Hyperglycemia in septic patients: an essential stress survival response in all, a robust marker for risk stratification in some, to be messed with in none. J Thorac Dis. 2016;8(7):E621-4. doi:10.21037/jtd.2016.05.24
- Ishihara M. Acute hyperglycemia in patients with acute myocardial infarction. Circ J. 2012;76(3):563-71. doi:10.1253/circj.cj-11-1376
- Galati SJ, Rayfield EJ. Approach to the patient with postprandial hypoglycemia. Endocr Pract. 2014;20(4):331-40. doi:10.4158/EP13132.RA
- Desimone ME, Weinstock RS. Non-diabetic hypoglycemia. In: Feingold KR, Anawalt B, Boyce A, et al., editors. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2000-. Updated September 23, 2017.
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