Sherpath: Laboratory Tests on Blood
Terms in this set (13)
Which blood test results are consistent with anemia?
RBC of 3 cell/mm3
* An RBC of 3 cell/mm3 is low for newborns, children, and adult males and females. A low RBC count is a sign of anemia.
Hemoglobin level of 9 g/dL
*A hemoglobin level of 9 g/dL is low for both adult males and females. A low hemoglobin level is a sign of anemia.
How should a report of a hemoglobin level of 12 g/dL be interpreted?
It is a low value for an adult male.
The normal value for an adult male is 14-18 g/dL. so 12 g/dL is low.
Which blood test results are indicative of chronic liver disease?
1. Mean corpuscular volume of 120 cell/mm3
The normal mean corpuscular volume (cells/mm3) is between 80-95. A mean corpuscular volume of 120 cell/mm3 is high. A high mean corpuscular volume indicates chronic liver disease.
2. Mean corpuscular hemoglobin of 39 pg/cell
The normal range for mean corpuscular hemoglobin (pg/cell) is 27-31. A mean corpuscular hemoglobin of 39 pg/cell is high. A high mean corpuscle hemoglobin indicates chronic liver disease.
Which coagulation test results are desirable for a patient on warfarin therapy?
1. Prothrombin time 1.5-2.0 greater than the control value
Prothrombin time is a measure of how long it takes the blood to clot. It is a useful measure of the effectiveness of the anticoagulant warfarin sodium. The target prothrombin time for a person on warfarin therapy is 1.5-2.0 times the control value of 11-12.5 seconds.
2. INR between 2 and 3
The International normalized ratio (INR) is a method of standardizing reports of prothrombin time results. The normal INR is 0.8-1.1 for a patient who is not on anticoagulant therapy, and 2-3 for prophylaxis or treatment of venous thrombosis with warfarin sodium.
Which coagulation test results are suggestive of a bleeding disorder?
1. aPTT time greater than 40 seconds
An aPTT is a measure of how long it takes the blood to clot. The reference range for aPTT is 30-40 sec. A longer than normal time for blood clotting suggests a bleeding disorder.
2. Fibrinogen level less than 200 mg/dL
The reference range for a fibrinogen level is 200-400 mg/dL. A low fibrinogen count indicates a bleeding disorder.
Which coagulation tests findings support a diagnosis of liver disease?
1. Prothrombin time greater than 12.5 seconds
The normal or control value for prothrombin time is 11-12.5 seconds. Greater than 12.5 is outside the control range and indicates prolonged time for blood clotting. Prothrombin, which converts fibrinogen to fibrin in the blood clotting process, is synthesized by the liver. If the liver is diseased and cannot make prothrombin normally impaired clotting occur
2. ibrinogen level less than 200
The reference range for fibrinogen level is 200-400 mg/dL. A low fibrinogen level occurs with liver disease, because fibrinogen is made in the liver and liver disease can interfere with the process.
Which blood test results are consistent with obesity
1. Glucose level of 130 mg/dL
Normal blood glucose level is between 60 and 100 mg/dL. A level of 130 mg/dL is elevated. Obesity is associated with elevated glucose levels.
2. High-density lipoprotein cholesterol 30 mg/dL
The normal value of high density lipoproteins (HDLs) in males is >45 and in females >55 mg/dL. An HDL of 30 mg/dL is low, and a low level is consistent with obesity
Match the condition with the blood chemistry result.
Glucose level of 130 mg/dL - Diabetes
LDL level of 159 mg/dL - Low-fat diet
Triglyceride level of 30 mg/dL - Excessive insulin
Glucose level of 55 mg/dL - Chronic kidney disease
Which blood chemistry findings are consistent with diabetes mellitus?
1. LDL of 160 mg/dL
The normal value of low density lipoproteins (LDLs) is <130 mg/dL. A level of 160 mg/dL is high and an elevated LDL level is associated with diabetes mellitus.
2. Blood sugar level of 150 mg/dL
Normal blood glucose level is between 60 and 100 mg/dL. A level of 150 mg/dL is elevated. Elevated blood glucose levels occur with diabetes mellitus.
3. Triglycerides 210 mg/dL
The normal value of triglycerides in males is 40-160 mg/dL and in females is 35-135 mg/dL. A level of 210 mg/dL is high and elevated triglyceride levels are associated with diabetes mellitus
4. Level of 10% glycosylated hemoglobin
Hemoglobin A1c (Hgb A1c), or glycosylated hemoglobin testing. Hgb A1C evaluates blood sugar levels over a period of 2 to 3 months. The normal value of Hgb A1c in patients without diabetes is 4% to 5.9% of hemoglobin. In patients with controlled diabetes, the Hgb A1C value is below 7%. A level of 10% is consistent with uncontrolled diabetes mellitus
Results of which blood chemistry tests are affected by malnutrition?
The normal value of alkaline phosphatase (ALP) is 30-120 units/L. Decreased ALP levels occur with malnutrition.
The normal value of albumin is 3.3-5 g/dL. Decreased albumin occurs with malnutrition
Blood urea nitrogen
The reference range for blood urea nitrogen is 10 to 20. Levels are decreased with malnutrition because urea is a by-product of protein metabolism.
What is the appropriate interpretation of an aPTT of 50 seconds?
Patient has a significantly elevated value.
An aPTT value of 50 seconds is elevated. The normal range is 30-40 seconds.
Which coagulation test is commonly used to monitor the effectiveness of warfarin?
International normalized ratio
The International normalized ratio (INR) is a method of standardizing reports of prothrombin time results. Use of the INR makes results of prothrombin time testing comparable regardless of which laboratory or method of testing is used. International normalized ratio is commonly used to guide warfarin therapy.
Which cardiac marker findings support a suspicion of cardiac muscle damage following an infarction?
Myoglobin level of 100 ng/mL
The normal level of myoglobin is less than 90 ng/mL. Elevated levels of myoglobin indicate cardiac damage.
Troponin I level of 0.07 ng/mL
The normal level of troponin I is 0.03 ng/mL or less. Elevated levels of troponin I indicates cardiac damage.
CK-MB of 5%
Levels of CK-MB of 3% or greater indicate cardiac damage.