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Understanding Blood Test Results

Mayuri Kulkarni
Understanding blood test results is important for early diagnosis of any health problem. The story enlists the interpretations for results of various important blood tests.
Blood test is a common diagnostic test with the help of which a physician can analyze the health condition of a person. It helps to determine the mineral content, physiological state, organ function, biochemical state, etc.
Almost every blood test report provides the normal range values of a particular blood component. However, only knowing these normal ranges is not helpful and one should be able to interpret the blood test results.
Understanding the results of a blood test, is nothing but knowing what high and low values of a particular blood component mean. Here are short interpretations of the results of different blood tests:

Blood Tests for Thyroid

Blood tests for the thyroid gland play an important role in determining whether the person is affected by some thyroid problems like hypothyroidism or hyperthyroidism. Physicians recommend a thyroid test, when the affected person shows symptoms of any one of the aforementioned thyroid problems.
The blood tests for thyroid, determines levels of TSH (Thyroid Stimulating Hormone), T4 (Thyroxine) and T3 (Triiodothyronine). These are thyroid hormones which are basically responsible for regulating metabolism of the body. If the thyroid results show normal levels of these hormones, then the thyroid gland is functioning properly.
Any fluctuation in the levels of these thyroid hormones can indicate serious health problems. The data given provides the different results of a thyroid test.
  • When TSH is High, T3 is Normal and T4 is Normal then it is Hypothyroidism (Mild)
  • When TSH is High, T3 is Low and T4 is Normal or Low then it is Hypothyroidism
  • When TSH is Low, T3 is Normal and T4 is Normal then it is Hyperthyroidism (Mild)
  • When TSH is Low, T3 is High or Normal  and T4 is High or Normal then it is Hyperthyroidism
  • When TSH is Low, T3 is Low or Normal and T4 is Low or Normal then it is Rare pituitary (secondary) hypothyroidism, Non-thyroidal illness

Blood Tests for Complete Blood Counts

A complete blood count (CBC) is a very important test that helps in diagnosing various health problems. It is a common blood test which is taken for general health check up and it gives the amount of blood components, like the WBC (white blood cells), RBC (red blood cells), and platelets.
The CBC also finds out the amount of hemoglobin present in the blood, which is basically the amount of oxygen carrying protein present in the blood. Other readings included in the CBC are, WBC differential, hematocrit, MCV, MCHC, and RDW. There are 5 different types of WBCs. The WBC differential gives the number of each type of WBC present in the blood.
Hematocrit is the percentage of RBC present in a given volume of blood. MCV (Mean Corpuscular Volume) is nothing but the average size of the RBCs. MCH stands for Mean Corpuscular Hemoglobin, which gives the average amount of oxygen carrying hemoglobin inside a RBC.
Mean Corpuscular Hemoglobin Concentration (MCHC) gives the average concentration of hemoglobin in a RBC. RDW or RCDW which stands for Red Blood Cell Distribution Width, gives the variation in the size of RBCs. The data given explains what can the increased or decreased amount of CBC results indicate.

CBC Test

WBC
Low:
Leukopenia, Bone marrow failure, Disease of the liver or spleen, Autoimmune/collagen vascular diseases.

High: Infection, Inflammation, Leukemia, Mental or Physical stress.
RBC
Low: 
Anemia, Blood loss, Hemolysis, Autoimmune/collagen vascular diseases, Erythropoietin deficiency, Leukemia, Nutritional deficiencies

High: Dehydration, Kidney disease, Pulmonary fibrosis, Congenital heart disease
Hemoglobin
Low: 
Anemia, Blood loss, Hemolysis, Autoimmune/collagen vascular diseases, Erythropoietin deficiency, Leukemia, Nutritional deficiencies

High: Dehydration, Kidney disease, Pulmonary fibrosis, Congenital heart disease
Hematocrit
Low: 
Anemia, Blood loss, Hemolysis, Autoimmune/collagen-vascular diseases, Erythropoietin deficiency, Leukemia, Nutritional deficiencies

High: Dehydration, Kidney disease, Pulmonary fibrosis, Congenital heart disease
MCV
Low: 
Iron deficiency, Thalassemia

High: B12 deficiency, Folate deficiency
MCH
Low: 
Iron deficiency, Thalassemia

High: B12 deficiency, Folate deficiency
Platelet
Low: 
Thrombocytopenia

High: Thrombocytosis

Blood Tests for Comprehensive Metabolic Panel

Comprehensive metabolic panel consists of a total of 14 blood tests that measure glucose levels, fluid balance, electrolyte levels, and analyze kidney and liver functioning. It is often part of a routine check up and gives the physician an idea of the overall physiology of a person.
Glucose, albumin, blood urea nitrogen (BUN), creatinine, calcium, sodium, potassium, bilirubin, etc. are some of the important blood components measured by a CMP test. Increased and decreased levels of any of these can indicate some health problem.
The data given below specifies what are the interpretations of increased and decreased levels of these components of blood.
1. Glucose
Low: Hypoglycemia
High: Hyperglycemia

2. Calcium
Low: Hypocalcemia
High: Hypercalcemia

3. Sodium
Low: Side effect of medication
High: Hypernatremia, Risk of high blood pressure, heart disease and stroke

4. Potassium
Low: Hypokalemia, Kidney problem
High: Hyperkalemia, Kidney problem

5. Albumin
Low: Hypoalbuminemia, Low protein diet, Kidney or Liver problem
High: Hyperalbuminemia, Dehydration, Vitamin A deficiency
6. BUN
Low: Liver problem
High: Hyperalbuminemia, Kidney problem, Dehydration, Congestive heart failure

7. BUN
Low: Liver problem
High: Hyperalbuminemia, Kidney problem, Dehydration, Congestive heart
8. Creatinine
Low: Decreased muscle mass
High: Kidney dysfunction

9. Bilirubin
Low: Not cause of concern
High: Jaundice

Understanding the results of a blood test is quite simple when one is aware of the normal ranges of a particular blood element.
A blood test is a very simple and useful diagnostic test that can help in diagnosing a number of health problems. Now, when one is aware of the interpretations of various blood test results, one need not hesitate and can clear their doubts when they make their next appointment with the physician.
Disclaimer: This story is for informative purposes only, and should not be used as a replacement for expert medical advice.